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#41
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Wed, 25 Mar 2009 21:23:54 -0500, John O'Flaherty
wrote: On Wed, 25 Mar 2009 17:43:45 -0500, John O'Flaherty wrote: On Wed, 25 Mar 2009 16:50:51 -0500, John Fields wrote: On Sat, 21 Mar 2009 11:17:36 -0500, John O'Flaherty wrote: On Fri, 20 Mar 2009 19:34:11 -0700, Capt. Cave Man wrote: {trimmed for clarity} The wiring certainly will NOT handle your claimed power handling capacity. It will introduce distortion as power increases. You need bigger feed lines, and they should be kept as short as can be feasibly done. What sort of distortion will increase with power due to small wires? --- If the temperature of the wires is caused to change by the charge flowing through them, then their resistance will be modulated by the power being dissipated by the load, and distortion products will be generated as sidebands. To get sidebands, the temperature would have to change significantly (compared to the DC resistance of the voice coil) within each cyle of the waveform. Does that actually happen? I decided to do some calculations as a reality check. Assume worst case non-linear distortion due to modulation of resistance of wires due to temperature change due to power will be felt at the lowest frequency, say 20 Hz. Assume 100W, 8 ohm speaker system. A relatively large change in temperature of the wire within a cycle would occur if the waveform was square, on for 12.5 ms, off for 12.5 ms., on negative for 12.5 ms and off again for 12.5 ms; at least it's easier to figure that way. Assume 18 ga copper hookup wire is used (not the stoutest wire), and 5 feet of it is needed (this is just the hookup wire, not the choke or voice coil resistance). This will have a resistance of .00639 ohm/ft * 5 ft = .03195 ohm. If the RMS power is 100 W, and it's concentrated into equal on/off times, the on-time power is 200 W. The power dissipated in the wire will be about 200 W * .03195 ohms / 8 ohms (wire resistance / speaker resistance) = 0.798 W. The duration is 12.5 ms, so the energy dumped into the wire is ~10 mJ. The density of the hookup wire is 1 lb / 203.4 ft. With 5 feet, 5 ft / 203.4 ft * 453 g/lb = 11.16 g is the mass of the hookup wire. The heat capacity of copper is .385 J/(g C). That gives 10 mJ / 11.16 g / (.385 J/g/C) = 0.00233 C temperature rise. Copper has a TCR of 3930 ppm/C, so the net resistance change is .00233 C * 3930 / 1e6 / C * .03195 ohms = 0.29 microohms. In an 8 ohm system, that's a change of 2.9e-7 / 8 or 3.7 micropercent. How could that cause perceptible distortion? The assumptions above assume heat gain for 1/4 period, and complete loss of that gain in the next 1/4 period, so that's kind of worst case for change. --- Nice work; makes sense to me. :-) --- Of course, I've ignored impedance, but that won't materially affect the result. --- Agree. --- On the radiusing question, usually, features that affect waves are not too much smaller than the waves. Worst-case (shortest) wavelength for audio @ 20 kHz in air is 1100 ft/sec / 20 kHz = .055 ft = 0.6 inches. I suspect that any compression into a corner is going to be averaged over audible wavelengths. It's hard to see how smoothing a corner is going to make a difference at audible frequencies, unless you're a dolphin, and then you'll have to use teak and spar varnish for your cabinet. --- I was thinking more along the line of a pressure wavefront being focused into a corner, where the pressure would increase to the point where the material forming the corner would be moved slightly and then, when it relaxed, adding its own signature to the mix. Additionally, the focusing would increase the density of the air in the region of the corner, increasing the sound velocity in that region. I'm not sure whether that would cause mixing and the creation of distortion products, but it would surely color the sound. Smooth corners, on the other hand, wouldn't be corners, and would cause less coloration. JF |
#42
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 06:15:34 -0500, John Fields
wrote: --- I was thinking more along the line of a pressure wavefront being focused into a corner, where the pressure would increase to the point where the material forming the corner would be moved slightly and then, when it relaxed, adding its own signature to the mix. Additionally, the focusing would increase the density of the air in the region of the corner, increasing the sound velocity in that region. I'm not sure whether that would cause mixing and the creation of distortion products, but it would surely color the sound. Smooth corners, on the other hand, wouldn't be corners, and would cause less coloration. JF Yes. This is an already established fact. Cabinets with non-parallel walls were able to alleviate some of it, which allowed the industry to further prove the phenomena. Sharp corners such as those found in cabinets that use a lot of internal bracing causes abrupt wave front disturbances that can be read as distortions and can be heard as colorations in the sound making the same sound played on different speakers sound different. Otherwise, all speakers would sound the same. So the poster that acted like you did not know what you were talking about is an idiot. |
#44
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
Jim Thompson wrote: Power FET's are to BJT's as Monster Cable is to zip-cord... only for the gullible to waste their money on ;-) Complete rubbish. Stay with what you know. Graham |
#45
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
John Fields wrote: John O'Flaherty wrote: The wiring certainly will NOT handle your claimed power handling capacity. It will introduce distortion as power increases. You need bigger feed lines, and they should be kept as short as can be feasibly done. What sort of distortion will increase with power due to small wires? --- If the temperature of the wires is caused to change by the charge flowing through them, then their resistance will be modulated by the power being dissipated by the load, and distortion products will be generated as sidebands. Actually I have found the real problem is the modulation of the LOAD resistance. Voice coils can run very hot these days. The load is therefore non-linear wheras the connecting wire doesn't get hot and just presents a resistance. The net effect is the same. I'm not sure about your use of the term sidebands. It just looked like classic harmonic distortion to me. Graham |
#46
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
John O'Flaherty wrote: To get sidebands, the temperature would have to change significantly (compared to the DC resistance of the voice coil) within each cyle of the waveform. Does that actually happen? Astonishingly, YES ! But it's not the connecting wire that gets hot, but the voice coil itself. I've seen it and measured it. Graham |
#47
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
John O'Flaherty wrote: I think shape must important (whether the walls are parallel or not, for example), but I doubt it is important at scales way smaller than the wavelength at the highest audio frequency. Avoid duplicating dimensions of height width or depth. Graham |
#48
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
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#49
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
"Capt. Cave Man" wrote: Silver plated copper PTFE (Teflon) military wire is pretty cheap in large gauges even. Customers like such special considerations. You mean they like being conned. You said "Pro",so how could it be "good enough"? Pros are sensible enough to know that silver plated Teflon wire is just a waste of money. Use thick gauge ordinary PVC covered copper wire instead. Graham |
#50
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
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#51
Posted to alt.binaries.schematics.electronic
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 05:37:50 -0500, John Fields
wrote: On Wed, 25 Mar 2009 20:31:09 -0400, wrote: On Wed, 25 Mar 2009 16:50:51 -0500, John Fields wrote: On Sat, 21 Mar 2009 11:17:36 -0500, John O'Flaherty wrote: On Fri, 20 Mar 2009 19:34:11 -0700, Capt. Cave Man wrote: On Fri, 20 Mar 2009 21:47:35 -0400, wrote: Fairly decent cabinet design. I hope you are using marine type plywood. A fine grain, high density particle board might be better. I use solid hardwoods throughout. You should also use a thicker glue between ALL of the elements, and you should coat the entire inside with a thick polyurethane so thick that ALL of the sharp corners inside become rounded. Why? --- Air is compressible, and when there's a pressure wave which propagates into a corner, the pressure will tend toward infinity as the wave is squeezed into the line describing the corner, with the result that the wood will move and, by doing so, modulate the pressure wave, creating sidebands. Thats funny! What audio store do you work for? --- I don't work for an audio store, I work for a consulting firm. Bose I bet... Besides, what makes you think it's funny? I've been building speakers for over 40 years, ****wit. Do you have some data you can use to prove my hypothesis incorrect or are you just flapping your jaws? you are retarded... You should not assume that your max wattage is equal to the wattage capacity stated on the driver(s). The wiring certainly will NOT handle your claimed power handling capacity. It will introduce distortion as power increases. You need bigger feed lines, and they should be kept as short as can be feasibly done. What sort of distortion will increase with power due to small wires? --- If the temperature of the wires is caused to change by the charge flowing through them, then their resistance will be modulated by the power being dissipated by the load, and distortion products will be generated as sidebands. Wow! Explain the fact no one can hear the tweeter protection lamp, which changes resistance about a million times more than the feed wire can?? --- What makes you think no one can hear the tweeter lamp? If its resistance changes _that_ much then surely it affects the dynamic range of the tweeter's SPL, which means that it colors the tweeter's output, which means that one would certainly be able to hear the difference between a lamped and non-lamped tweeter. --- JF Does that stand for Jerk-****er? --- Why do you want to know? Are you looking for a dick up your ass? --- Please go away... please... --- Nope; I'm here for the long haul. thats OK, intelligent people ignore fools like you I notice though, this is your first post here. wrong, **** for brains, I've been around here since 95 PLONK |
#52
Posted to alt.binaries.schematics.electronic
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 17:33:27 +0000, Eeyore
wrote: wrote: Wow! Explain the fact no one can hear the tweeter protection lamp, which changes resistance about a million times more than the feed wire can?? Not in normal use. Thats right, even though the filiment changes resistance at ALL changes in temperature, from absolut zero and up. |
#53
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 17:27:28 +0000, Eeyore
wrote: But it's not the connecting wire that gets hot, but the voice coil itself. I've seen it and measured it. If the connecting wires are small, they can heat up as well. |
#54
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 17:38:13 +0000, Eeyore
wrote: "Capt. Cave Man" wrote: Silver plated copper PTFE (Teflon) military wire is pretty cheap in large gauges even. Customers like such special considerations. You mean they like being conned. You're an idiot. The place where I get my SPC mil wire has nothing to do with any audio idiot like you being around. It is simple math. Silver plated copper tarnishes at a slower rate than bare copper or tinned copper does. SPC wire is also a better conductor than TPC or bare copper is. You said "Pro",so how could it be "good enough"? Pros are sensible enough to know that silver plated Teflon wire is just a waste of money. You're a goddamned idiot. When the difference in price is pennies per foot, you can bet that a knowledgeable "Pro" will use the best conductors he can find, and SPC mil wire is pretty cheap. You're a ****ing retarded twit for thinking that I was touting this wire from something I heard from a retard like you. Sorry, retard, but I do not listen to retards like you. Goodbye. Use thick gauge ordinary PVC covered copper wire instead. You are ordinary. And stupid as well. |
#55
Posted to alt.binaries.schematics.electronic
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 18:19:54 -0400, wrote:
On Thu, 26 Mar 2009 05:37:50 -0500, John Fields wrote: On Wed, 25 Mar 2009 20:31:09 -0400, wrote: On Wed, 25 Mar 2009 16:50:51 -0500, John Fields wrote: On Sat, 21 Mar 2009 11:17:36 -0500, John O'Flaherty wrote: On Fri, 20 Mar 2009 19:34:11 -0700, Capt. Cave Man wrote: On Fri, 20 Mar 2009 21:47:35 -0400, wrote: Fairly decent cabinet design. I hope you are using marine type plywood. A fine grain, high density particle board might be better. I use solid hardwoods throughout. You should also use a thicker glue between ALL of the elements, and you should coat the entire inside with a thick polyurethane so thick that ALL of the sharp corners inside become rounded. Why? --- Air is compressible, and when there's a pressure wave which propagates into a corner, the pressure will tend toward infinity as the wave is squeezed into the line describing the corner, with the result that the wood will move and, by doing so, modulate the pressure wave, creating sidebands. Thats funny! What audio store do you work for? --- I don't work for an audio store, I work for a consulting firm. Bose I bet... You're an absolute idiot. No bet required. Besides, what makes you think it's funny? I've been building speakers for over 40 years, ****wit. Then you are the ****wit. Some dope that throws drivers in a box he screwed together is NOT "building speakers", it is building CRAP when it is you doing it, because you do not know the first thing about air and sound. Must less the reflections of such inside a cabinet. If you did, you would not have spewed the total CRAP you spewed. Do you have some data you can use to prove my hypothesis incorrect or are you just flapping your jaws? you are retarded... No, maniacal twit, it is YOU that is retarded. You should not assume that your max wattage is equal to the wattage capacity stated on the driver(s). The wiring certainly will NOT handle your claimed power handling capacity. It will introduce distortion as power increases. You need bigger feed lines, and they should be kept as short as can be feasibly done. What sort of distortion will increase with power due to small wires? --- If the temperature of the wires is caused to change by the charge flowing through them, then their resistance will be modulated by the power being dissipated by the load, and distortion products will be generated as sidebands. Wow! Explain the fact no one can hear the tweeter protection lamp, which changes resistance about a million times more than the feed wire can?? --- What makes you think no one can hear the tweeter lamp? If its resistance changes _that_ much then surely it affects the dynamic range of the tweeter's SPL, which means that it colors the tweeter's output, which means that one would certainly be able to hear the difference between a lamped and non-lamped tweeter. --- JF Does that stand for Jerk-****er? --- Why do you want to know? Are you looking for a dick up your ass? --- Please go away... please... --- Nope; I'm here for the long haul. thats OK, intelligent people ignore fools like you That leaves you out then. I notice though, this is your first post here. wrong, **** for brains, I've been around here since 95 Sure, ****head. PLONK Oh boy! Another total retard that thinks we are all interested in seeing his filter file edit session announcement. You're an idiot. Get the **** out. Stay the **** out. Go find a tall bridge and jump off of it. What you know about speaker cabinet design advancements would fit on the tip of a molecular probe. |
#56
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
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#57
Posted to alt.binaries.schematics.electronic
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 17:50:47 -0700, Corbomite Carrie
wrote: On Thu, 26 Mar 2009 18:19:54 -0400, wrote: On Thu, 26 Mar 2009 05:37:50 -0500, John Fields wrote: On Wed, 25 Mar 2009 20:31:09 -0400, wrote: On Wed, 25 Mar 2009 16:50:51 -0500, John Fields wrote: On Sat, 21 Mar 2009 11:17:36 -0500, John O'Flaherty wrote: On Fri, 20 Mar 2009 19:34:11 -0700, Capt. Cave Man wrote: On Fri, 20 Mar 2009 21:47:35 -0400, wrote: Fairly decent cabinet design. I hope you are using marine type plywood. A fine grain, high density particle board might be better. I use solid hardwoods throughout. You should also use a thicker glue between ALL of the elements, and you should coat the entire inside with a thick polyurethane so thick that ALL of the sharp corners inside become rounded. Why? --- Air is compressible, and when there's a pressure wave which propagates into a corner, the pressure will tend toward infinity as the wave is squeezed into the line describing the corner, with the result that the wood will move and, by doing so, modulate the pressure wave, creating sidebands. Thats funny! What audio store do you work for? --- I don't work for an audio store, I work for a consulting firm. Bose I bet... You're an absolute idiot. No bet required. Besides, what makes you think it's funny? I've been building speakers for over 40 years, ****wit. Then you are the ****wit. Some dope that throws drivers in a box he screwed together is NOT "building speakers", it is building CRAP when it is you doing it, because you do not know the first thing about air and sound. Must less the reflections of such inside a cabinet. If you did, you would not have spewed the total CRAP you spewed. Do you have some data you can use to prove my hypothesis incorrect or are you just flapping your jaws? you are retarded... No, maniacal twit, it is YOU that is retarded. You should not assume that your max wattage is equal to the wattage capacity stated on the driver(s). The wiring certainly will NOT handle your claimed power handling capacity. It will introduce distortion as power increases. You need bigger feed lines, and they should be kept as short as can be feasibly done. What sort of distortion will increase with power due to small wires? --- If the temperature of the wires is caused to change by the charge flowing through them, then their resistance will be modulated by the power being dissipated by the load, and distortion products will be generated as sidebands. Wow! Explain the fact no one can hear the tweeter protection lamp, which changes resistance about a million times more than the feed wire can?? --- What makes you think no one can hear the tweeter lamp? If its resistance changes _that_ much then surely it affects the dynamic range of the tweeter's SPL, which means that it colors the tweeter's output, which means that one would certainly be able to hear the difference between a lamped and non-lamped tweeter. --- JF Does that stand for Jerk-****er? --- Why do you want to know? Are you looking for a dick up your ass? --- Please go away... please... --- Nope; I'm here for the long haul. thats OK, intelligent people ignore fools like you That leaves you out then. I notice though, this is your first post here. wrong, **** for brains, I've been around here since 95 Sure, ****head. PLONK Oh boy! Another total retard that thinks we are all interested in seeing his filter file edit session announcement. You're an idiot. Get the **** out. Stay the **** out. Go find a tall bridge and jump off of it. What you know about speaker cabinet design advancements would fit on the tip of a molecular probe. Gotcha again, you mutha-****ing little *******o ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Barack Obama, King of the Democratic People's Republic of America |
#58
Posted to alt.binaries.schematics.electronic
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
On Thu, 26 Mar 2009 18:19:54 -0400, wrote:
On Thu, 26 Mar 2009 05:37:50 -0500, John Fields wrote: On Wed, 25 Mar 2009 20:31:09 -0400, wrote: On Wed, 25 Mar 2009 16:50:51 -0500, John Fields wrote: On Sat, 21 Mar 2009 11:17:36 -0500, John O'Flaherty wrote: On Fri, 20 Mar 2009 19:34:11 -0700, Capt. Cave Man wrote: On Fri, 20 Mar 2009 21:47:35 -0400, wrote: Fairly decent cabinet design. I hope you are using marine type plywood. A fine grain, high density particle board might be better. I use solid hardwoods throughout. You should also use a thicker glue between ALL of the elements, and you should coat the entire inside with a thick polyurethane so thick that ALL of the sharp corners inside become rounded. Why? --- Air is compressible, and when there's a pressure wave which propagates into a corner, the pressure will tend toward infinity as the wave is squeezed into the line describing the corner, with the result that the wood will move and, by doing so, modulate the pressure wave, creating sidebands. Thats funny! What audio store do you work for? --- I don't work for an audio store, I work for a consulting firm. Bose I bet... --- You lose, putz. Bose isn't a consulting firm. --- Besides, what makes you think it's funny? I've been building speakers for over 40 years, ****wit. --- And making 40 years' worth of mistakes in the process, no doubt. --- Do you have some data you can use to prove my hypothesis incorrect or are you just flapping your jaws? you are retarded... --- That isn't data, that's just trying to use insult to avoid the issue. Do you have data to back up your claims or don't you? --- You should not assume that your max wattage is equal to the wattage capacity stated on the driver(s). The wiring certainly will NOT handle your claimed power handling capacity. It will introduce distortion as power increases. You need bigger feed lines, and they should be kept as short as can be feasibly done. What sort of distortion will increase with power due to small wires? --- If the temperature of the wires is caused to change by the charge flowing through them, then their resistance will be modulated by the power being dissipated by the load, and distortion products will be generated as sidebands. Wow! Explain the fact no one can hear the tweeter protection lamp, which changes resistance about a million times more than the feed wire can?? --- What makes you think no one can hear the tweeter lamp? If its resistance changes _that_ much then surely it affects the dynamic range of the tweeter's SPL, which means that it colors the tweeter's output, which means that one would certainly be able to hear the difference between a lamped and non-lamped tweeter. --- JF Does that stand for Jerk-****er? --- Why do you want to know? Are you looking for a dick up your ass? --- Please go away... please... --- Nope; I'm here for the long haul. thats OK, intelligent people ignore fools like you --- Since you haven't been able to, which camp does that put _you_ in? --- I notice though, this is your first post here. wrong, **** for brains, I've been around here since 95 --- On USENET, maybe, but I don't get around to alt.coprophagous.dolts that often, so I must have missed your _important_ commentaries. --- PLONK --- So you're just another chicken**** coward who won't stand his ground and wants to have the last word? Such being the case, the plonk translates into: "Oh please, Mommy, what can I do to keep him from being mean to me?" JF |
#59
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
wrote: I've been building speakers for over 40 years, ****wit. Really? Do you cast the frames, or press them from sheet steel? What type of surrounds do you use, and do you wind the voice coils from Aluminum, or Copper? -- http://improve-usenet.org/index.html Goggle Groups, and Web TV users must request to be white listed, or I will not see your messages. If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm |
#60
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
wrote: On Thu, 26 Mar 2009 17:33:27 +0000, Eeyore wrote: wrote: Wow! Explain the fact no one can hear the tweeter protection lamp, which changes resistance about a million times more than the feed wire can?? Not in normal use. Thats right, even though the filiment changes resistance at ALL changes in temperature, from absolut zero and up. Bull****. No speaker works at absolute Zero. -- http://improve-usenet.org/index.html Goggle Groups, and Web TV users must request to be white listed, or I will not see your messages. If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm |
#61
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
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#62
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
John Fields wrote: On Thu, 26 Mar 2009 18:19:54 -0400, wrote: John Fields wrote: I don't work for an audio store, I work for a consulting firm. Bose I bet... --- You lose, putz. Bose isn't a consulting firm. --- Besides, what makes you think it's funny? I've been building speakers for over 40 years, ****wit. --- And making 40 years' worth of mistakes in the process, no doubt. In the case of Bose, unquestionably. Audio pros have a phrase "no highs, no lows, it must be Bose". Graham |
#63
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
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#64
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Building DIY pro. speakers - 500_watt_top_box.jpg (1/1)
"Capt. Cave Man" wrote: Eeyore wrote: "Capt. Cave Man" wrote: Silver plated copper PTFE (Teflon) military wire is pretty cheap in large gauges even. Customers like such special considerations. You mean they like being conned. You're an idiot. The place where I get my SPC mil wire has nothing to do with any audio idiot like you being around. You destroyed any minimal credibility you ever had here. Have you any idea who my and my colleauges' clients are ? We're talking #1 grade studios ( such as AIR ) and the like. I could give you a list as long as my arm. BTW, how many platinum albums have you seen in YOUR clients premises ? Graham |
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