Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

Many thanks in advance!

Sam

On Dec 21, 1:25 pm, Sam Takoy wrote:
Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

Many thanks in advance!

Sam

Andy comments:

Post in sci.electronics.design Lots of good advice there

Sam Takoy wrote:
Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

Many thanks in advance!

Sam
Hi,
Pyl, I wouldn't trust their specs. but general rule is you can connet
higher Ohmage speakers to an amp than spec. says. If you connect lower
one it can burn out the amp or speaker. As an example if amp calls for
minimum 4 Ohm speakers, I can connect anything higher than 4 Ohms. But
if you mismatch impedance it will chage power output. According to
simple Ohm's law.

On 12/21/2010 11:25 AM Sam Takoy spake thus:

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

[other advice about posting in electronics NG good; try rec.audio.tech
as well]

Can't give you a definitive answer, but am curious about that speaker
selector. Is it just a simple switch box? What's its configuration? How
many speakers does it handle? Can you have more than one set of speakers
active at the same time?

If it's really just a switchbox, then impedance makes absolutely no
difference. However, it's possible it also contains some load resistors,
which would make impedance matter. You could determine this by using an
ohmmeter (digital meter set on resistance, for example). Test between
input & ground and output & ground; it should be an open (infinite
resistance). If not, then you have resistors inside.

The worst case for you would be if you ended up running two sets of
4-ohm speakers in parallel from your amp, which would present a 2-ohm
impedance to the amp. The amp would probably not like this (could
overheat, blow fuse or circuit breaker or release the magic smoke).


--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.

Sam Takoy wrote:
Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

The thing to pay attention to is the amp. The speaker selector is a passive
device, and should be fine with the 4 ohm speakers. Since the guy at Pyle
confirmed this, you're good to go.

Jon

On Tue, 21 Dec 2010 14:25:59 -0500, Sam Takoy
wrote:

Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

Many thanks in advance!

Sam

I believe the "8 ohm minimum" has more to do with what load will be
presented at the amp. If you use 4 ohm speakers instead of 8 AND
have multiple sets going at the same time you will present a very low
impedance to the amp. If you are running only a few sets you should
be fine.

On Dec 21, 3:55*pm, wrote:
On Tue, 21 Dec 2010 14:25:59 -0500, Sam Takoy
wrote:





Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms *(Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

Many thanks in advance!

Sam

I believe the "8 ohm minimum" has more to do with what load will be
presented at the amp. If you use 4 ohm speakers instead of 8 AND
have multiple sets going at the same time you will present a very low
impedance to the amp. If you are running only a few sets you should
be fine.- Hide quoted text -

- Show quoted text -

Since the amp, speakers and selector all are made by Pyle, sounds like
a good question to ask them. That selector has some kind of
"protection" built-in to it. Possibly to prevent you from selecting
too many speakers in parallel and damaging the amp. That protection
might have something to do with what the minimum speaker impedance can
be.

If it were me, I'd find a simple, less expensive selector. $100
sounds like a lot of money for a switch. You can get a whole
Wireless N router for less money.

On Tue, 21 Dec 2010 12:36:33 -0700, Tony Hwang
wrote:



Sam Takoy wrote:
Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

Many thanks in advance!

Sam
Hi,
Pyl, I wouldn't trust their specs. but general rule is you can connet
higher Ohmage speakers to an amp than spec. says. If you connect lower
one it can burn out the amp or speaker. As an example if amp calls for
minimum 4 Ohm speakers, I can connect anything higher than 4 Ohms. But
if you mismatch impedance it will chage power output. According to
simple Ohm's law.
If it is a simple speaker SELECTOR (I read that as a switch) the 4
ohm system should work fine as long as you are not approaching the
power limit of the switch. A 4 ohm speaker will draw more power than
an 8 ohm speaker.

On 12/21/2010 11:36 AM Tony Hwang spake thus:

Pyl, I wouldn't trust their specs. but general rule is you can connet
higher Ohmage speakers to an amp than spec. says. If you connect lower
one it can burn out the amp or speaker.

Only half correct.

You can burn out the amp, but not the speaker (well, assuming you don't
overdrive it). Using a lower impedance speaker than allowed will only
overload the amp.

Think of a generator and a load: if you connect an excessive load to a
generator (say, a 4 kW heater to a 1 kW generator), it's not going to
hurt the load, but it could fry the generator.


--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.

On 12/21/2010 11:36 AM Tony Hwang spake thus:

Pyl, I wouldn't trust their specs. but general rule is you can connet
higher Ohmage speakers to an amp than spec. says. If you connect lower
one it can burn out the amp or speaker.

Only half correct.

You can burn out the amp, but not the speaker (well, assuming you don't
overdrive it). Using a lower impedance speaker than allowed will only
overload the amp.

Think of a generator and a load: if you connect an excessive load to a
generator (say, a 4 kW heater to a 1 kW generator), it's not going to
hurt the load, but it could fry the generator (or blow its fuse or breaker).


--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.

On 12/21/2010 2:25 PM, Sam Takoy wrote:
Hi,

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".


We aren't matching impedances, what we are doing is making sure that the
amp doesn't blow up! (Impedance matching is tube stuff)

Amps are rated for the minimum impedance they can drive without smoking.
The lower impedance, the more current and more power.

There are two basic ways you can have a single amp channel drive more
than one set of speakers. Cheapie stereos, put the speakers in series,
when they have A and B speaker switches. That is double the impedance
and half the available power.

Running speakers in parallel, is twice the current and twice the
power. If you take an amp rated at 4 ohm, that would mean you could run
two 8 ohm sets in parallel. No problem.

A good woofer is usually designed to be driven directly by the low
impedance of the amp, so high end speakers should be wired in parallel.
This will affect a number of low frequency issues related to dampening.

I'm not sure how this switch box works, you can sign up and download
the manual, but I suspect it wires them in parallel and then uses some
protection circuitry to limit drawing too much from the amp. That jives
with the ad copy.


The tech guy at Pyle says that this is an OK configuration. Since I
don't know anything about impedance matching and this seems to
contradict the description, I'd like to ask here!

Keep the volume moderate and you will have no problem. Cranking the
volume may put your amp at some risk, hard to really tell without
knowing more.

Pyle stuff used to have some balls to it. Don't know about now.

Jeff


Many thanks in advance!

Sam

On 12/21/2010 7:36 PM Jeff Thies spake thus:

On 12/21/2010 2:25 PM, Sam Takoy wrote:

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

We aren't matching impedances, what we are doing is making sure that the
amp doesn't blow up! (Impedance matching is tube stuff)

Odd thing to say: actually, transistor amps care about impedance
matching too. In fact, it may be even more important with solid state,
as there's no output transformer as in a tube amp to isolate the load
from the final stage. Very easy to smoke transistors (or to cause the
angry gods to activate the shutdown circuit or blowenfusen). In
transistor amps, speakers are (more or less) directly coupled to the
output stage, usually with a large capacitor to block DC.


--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.

On Dec 22, 12:02*am, David Nebenzahl wrote:
On 12/21/2010 7:36 PM Jeff Thies spake thus:





On 12/21/2010 2:25 PM, Sam Takoy wrote:

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

We aren't matching impedances, what we are doing is making sure that the
amp doesn't blow up! (Impedance matching is tube stuff)

Odd thing to say: actually, transistor amps care about impedance
matching too. In fact, it may be even more important with solid state,
as there's no output transformer as in a tube amp to isolate the load
from the final stage. Very easy to smoke transistors (or to cause the
angry gods to activate the shutdown circuit or blowenfusen). In
transistor amps, speakers are (more or less) directly coupled to the
output stage, usually with a large capacitor to block DC.

--
Comment on quaint Usenet customs, from Usenet:

* *To me, the *plonk...* reminds me of the old man at the public hearing
* *who stands to make his point, then removes his hearing aid as a sign
* *that he is not going to hear any rebuttals.- Hide quoted text -

- Show quoted text -

Agreed, impedance matching applies all over the place.

As others have noted the most likely reason fo rthe 8 ohm minimum is
that the selector switch probably supports turning on two pairs of
speakers. And it likely does it by connectng them in parallel. That
results in a 2 ohm load if you have 4 ohm speakers which some amps
can't handle. But a lot of newer amps can so check your amp manual.
Or don't turn two sets on at the same time.

On 12/22/2010 12:02 AM, David Nebenzahl wrote:
On 12/21/2010 7:36 PM Jeff Thies spake thus:

On 12/21/2010 2:25 PM, Sam Takoy wrote:

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

We aren't matching impedances, what we are doing is making sure that
the amp doesn't blow up! (Impedance matching is tube stuff)

Odd thing to say: actually, transistor amps care about impedance
matching too.

No, with a few odd exceptions and for a few uses not pertinent here.

http://en.wikipedia.org/wiki/Constan...speaker_system

Early McIntosh solid state amps had transformers, and some real balls too.

In fact, it may be even more important with solid state,
as there's no output transformer as in a tube amp to isolate the load
from the final stage. Very easy to smoke transistors (or to cause the
angry gods to activate the shutdown circuit or blowenfusen).

This is all current driven. You are absolutely correct that running too
low an impedance speaker can damage an amp (I read your other posts and
did not disagree). There is no matching that takes place though for
almost all home systems. It's just a caution. Think rating, not
matching. In general you want the output impedance of the amp and wiring
to be as low as possible, to minimize losses and to keep from having
dampening issues.


In
transistor amps, speakers are (more or less) directly coupled to the
output stage, usually with a large capacitor to block DC.

Almost. They are usually directly driven and transistor amps have a very
low source resistance. A tube is an entirely different beast. It
operates at a much higher voltaqe and has a much higher resistance.
There are almost no tube amps that work without a transformer, just as
there are very few transistor amps that do.

DC blocking caps are very rare in home amps of any money. It is much
more common to have separate plus and minus supplies and there is no DC
to block. A single supply will either need a cap or will need to use a
bridge mode configuration where the ground lead is an output, not ground.

I fixed and built amps for longer than I care to remember. There is an
awful lot I don't know, but not about this.

Jeff

On 12/22/2010 7:44 AM, jamesgangnc wrote:
As others have noted the most likely reason for the 8 ohm minimum is
that the selector switch probably supports turning on two pairs of
speakers. And it likely does it by connecting them in parallel. That
results in a 2 ohm load if you have 4 ohm speakers which some amps
can't handle. But a lot of newer amps can so check your amp manual.
Or don't turn two sets on at the same time.




This is where I'd put my money. Pretty much any amp can handle a 4 ohm
load (two 8 ohm speakers in parallel). Not nearly so many can handle a
2 ohm load (two 4 ohm speakers in parallel). So probably the 8 ohm
speaker limitation is there merely to protect the amp from getting
accidentally fried if it happens to be the more common sort.

Certainly you can run a pair (one left; one right) of 4 ohm speakers
connected to that amp. What you can't do is have two sets of 4 ohm
speakers because the resulting 2 ohm load will overload that particular amp.



Jay

On Dec 22, 10:05*am, Jay Hanig wrote:
On 12/22/2010 7:44 AM, jamesgangnc wrote:

As others have noted the most likely reason for the 8 ohm minimum is
that the selector switch probably supports turning on two pairs of
speakers. *And it likely does it by connecting them in parallel. *That
results in a 2 ohm load if you have 4 ohm speakers which some amps
can't handle. *But a lot of newer amps can so check your amp manual.
Or don't turn two sets on at the same time.

This is where I'd put my money. *Pretty much any amp can handle a 4 ohm
load (two 8 ohm speakers in parallel). *Not nearly so many can handle a
2 ohm load (two 4 ohm speakers in parallel). *So probably the 8 ohm
speaker limitation is there merely to protect the amp from getting
accidentally fried if it happens to be the more common sort.

Certainly you can run a pair (one left; one right) of 4 ohm speakers
connected to that amp. *What you can't do is have two sets of 4 ohm
speakers because the resulting 2 ohm load will overload that particular amp.

Jay

Odd are that if the op is looking at a speaker switch it is to allow
him to connect other sets of speakers. And that would also likely to
be to power sets in other locations. The manual for that amp clearly
shows two pairs of 8 ohm speakers when configured with more than one
set of speakers.

Even when an amp can handle 2 ohms it increases the line losses and
harmonic distortion.

So the op needs to find a speaker switch that impedance matches
multiple sets of 4 ohm speakers. Such switches are available but they
are more expensive. That's because they are not just switches inside.

I've run 2 ohm loads on some of my equipment but it all can either
handle it or has protection circuitry in the output stage.

jamesgangnc wrote:
On Dec 22, 12:02 am, David Nebenzahl wrote:
On 12/21/2010 7:36 PM Jeff Thies spake thus:





On 12/21/2010 2:25 PM, Sam Takoy wrote:
This is offtopic, but related to home improvement and this is where I
get my best information.
I want to connect my ipod - amp - speaker selector - speakers
My amp is 4 Ohms (Pyle PTAU45)
My speakers are 4 Ohms (Pyle PWRC51)
But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".
We aren't matching impedances, what we are doing is making sure that the
amp doesn't blow up! (Impedance matching is tube stuff)
Odd thing to say: actually, transistor amps care about impedance
matching too. In fact, it may be even more important with solid state,
as there's no output transformer as in a tube amp to isolate the load
from the final stage. Very easy to smoke transistors (or to cause the
angry gods to activate the shutdown circuit or blowenfusen). In
transistor amps, speakers are (more or less) directly coupled to the
output stage, usually with a large capacitor to block DC.

--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.- Hide quoted text -

- Show quoted text -

Agreed, impedance matching applies all over the place.

As others have noted the most likely reason fo rthe 8 ohm minimum is
that the selector switch probably supports turning on two pairs of
speakers. And it likely does it by connectng them in parallel. That
results in a 2 ohm load if you have 4 ohm speakers which some amps
can't handle. But a lot of newer amps can so check your amp manual.
Or don't turn two sets on at the same time.

Downloading a manual
http://www.pyleaudio.com/manuals/PSS4PSS6.pdf
the speaker switch allows connecting 0 to 6 pairs of speakers at the
same time. They are all connected in parallel (although the combined
impedance of 4 speakers is 2.4 ohms instead of 2 ohms with 8 ohm
speakers - ?). The stated impedance of 6 - 8 ohm speakers is 1.7 ohms.
Maybe their amps will work with a 1.7 ohm load (if the speakers are 8 ohms).

Not obvious how Sam intended to use the switch..

If used to connect one speaker pair at a time the switch would be OK
(but probably relatively expensive from another post).

If used for 2 speaker pairs at a time the amp would have to work with a
2 ohm load (as james said).

You certainly couldn't connect 6 speaker pairs at a time.

--
bud--

On Dec 22, 8:06*am, Jeff Thies wrote:
On 12/22/2010 12:02 AM, David Nebenzahl wrote:





On 12/21/2010 7:36 PM Jeff Thies spake thus:

On 12/21/2010 2:25 PM, Sam Takoy wrote:

This is offtopic, but related to home improvement and this is where I
get my best information.

I want to connect my ipod - amp - speaker selector - speakers

My amp is 4 Ohms (Pyle PTAU45)

My speakers are 4 Ohms (Pyle PWRC51)

But the speaker selector that I want to buy (Pyle PSS6) says "with
speakers systems that are 8 Ohms minimum".

We aren't matching impedances, what we are doing is making sure that
the amp doesn't blow up! (Impedance matching is tube stuff)

Odd thing to say: actually, transistor amps care about impedance
matching too.

No, with a few odd exceptions and for a few uses not pertinent here.

http://en.wikipedia.org/wiki/Constan...speaker_system

Early McIntosh solid state amps had transformers, and some real balls too..

* In fact, it may be even more important with solid state,

as there's no output transformer as in a tube amp to isolate the load
from the final stage. Very easy to smoke transistors (or to cause the
angry gods to activate the shutdown circuit or blowenfusen).

This is all current driven. You are absolutely correct that running too
low an impedance speaker can damage an amp (I read your other posts and
did not disagree). There is no matching that takes place though for
almost all home systems. It's just a caution. Think rating, not
matching. In general you want the output impedance of the amp and wiring
to be as low as possible, to minimize losses and to keep from having
dampening issues.

* In

transistor amps, speakers are (more or less) directly coupled to the
output stage, usually with a large capacitor to block DC.

Almost. They are usually directly driven and transistor amps have a very
low source resistance. A tube is an entirely different beast. It
operates at a much higher voltaqe and has a much higher resistance.
There are almost no tube amps that work without a transformer, just as
there are very few transistor amps that do.

DC blocking caps are very rare in home amps of any money. It is much
more common to have separate plus and minus supplies and there is no DC
to block. A single supply will either need a cap or will need to use a
bridge mode configuration where the ground lead is an output, not ground.

I fixed and built amps for longer than I care to remember. There is an
awful lot I don't know, but not about this.

* *Jeff



- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -



The bottom line would seem to be that:

A - Pyle makes the amp, speakers and speaker selector switch
B - The amp is rated for a 4 ohm min load
C - The speakers are rated at 4 ohms impedance
D - The switch just selects one speaker or more than one speaker to be
driven, in which case they are in parallel.

Given the above, he can use the selector to select any one set of
speakers at a time. If he selects more than one set, then he has an
impedance of 2 ohms. So, the store is correct, at least in part.
It will work in this manner. But if you want to be able to select
more than one set, then clearly you are violating the specs.
Probably would still work fine, as long as you don't want
to crank up the volume approaching maximum. But, I'd contact Pyle
and ask them what's up. They make all the eqpt and clearly how you
can use it is limited.

snip



The bottom line would seem to be that:

A - Pyle makes the amp, speakers and speaker selector switch
B - The amp is rated for a 4 ohm min load
C - The speakers are rated at 4 ohms impedance

I find that interesting, 4 ohm home speakers. This is usually the realm
of car audio or anything else battery operated.

Now, I don't find the OP buying L Pads, so I think this switch box is no
better than one made of light switches or something similar.


D - The switch just selects one speaker or more than one speaker to be
driven, in which case they are in parallel.

Given the above, he can use the selector to select any one set of
speakers at a time. If he selects more than one set, then he has an
impedance of 2 ohms. So, the store is correct, at least in part.
It will work in this manner. But if you want to be able to select
more than one set, then clearly you are violating the specs.
Probably would still work fine, as long as you don't want
to crank up the volume approaching maximum. But, I'd contact Pyle
and ask them what's up. They make all the eqpt and clearly how you
can use it is limited.

The amp will probably protect itself before anything goes bad. (They
usually sample current in one of the output transistors).

People were always trying to blow up Pyle stuff, think of the target
audience. Pyle stuff is supposed to be tough, or at least that is how I
remember it. Not greatest stuff, but tough.

What Pyle will commit to telling you over the phone, would be an
interesting exercise.

Jeff
Who has seen some audio equipment abused.

On 12/23/2010 4:27 AM Jeff Thies spake thus:

Given the above, he can use the selector to select any one set of
speakers at a time. If he selects more than one set, then he has an
impedance of 2 ohms. So, the store is correct, at least in part.
It will work in this manner. But if you want to be able to select
more than one set, then clearly you are violating the specs.
Probably would still work fine, as long as you don't want
to crank up the volume approaching maximum. But, I'd contact Pyle
and ask them what's up. They make all the eqpt and clearly how you
can use it is limited.

The amp will probably protect itself before anything goes bad. (They
usually sample current in one of the output transistors).

Well, yeah, I'd expect most any amplifier made today to have some kind
of shutdown protection circuit built in. You could probably
short-circuit the speaker terminals and the thing would just turn itself
off (not exactly, but that's the effect).


--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.

On 12/23/2010 6:25 PM, David Nebenzahl wrote:
On 12/23/2010 4:27 AM Jeff Thies spake thus:

Given the above, he can use the selector to select any one set of
speakers at a time. If he selects more than one set, then he has an
impedance of 2 ohms. So, the store is correct, at least in part.
It will work in this manner. But if you want to be able to select
more than one set, then clearly you are violating the specs.
Probably would still work fine, as long as you don't want
to crank up the volume approaching maximum. But, I'd contact Pyle
and ask them what's up. They make all the eqpt and clearly how you
can use it is limited.

The amp will probably protect itself before anything goes bad. (They
usually sample current in one of the output transistors).

Well, yeah, I'd expect most any amplifier made today to have some kind
of shutdown protection circuit built in. You could probably
short-circuit the speaker terminals and the thing would just turn itself
off (not exactly, but that's the effect).


Not an experiment either one of us is willing to try, but I think you
are right. :-)

I think thermal fatigue/shock gets most good amps. The connections
break down inside the transistor because the materials have dissimilar
expansion rates. When I was fixing amps that was my impression, most
amps would fail when you weren't doing anything particularly bad to them.

Jeff