Dual concentric speaker
 

Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to be
a plastic stem passing through the bass cone, wires to it passing through
that cone also. How to remove the tweeter section to get to ,hopefully,
failing wiring joint that is normally covered by the dome of a single normal
speaker. There is a square recess in that stem, a "Frenchman" to break a
plastic weld joint ? no fixings proper seen anywhere.

Dual concentric speaker
 

On Jun 14, 12:42*am, "N_Cook" wrote:
Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to be
a plastic stem passing through the bass cone, wires to it passing through
that cone also. How to remove the tweeter section to get to ,hopefully,
failing wiring joint that is normally covered by the dome of a single normal
speaker. There is a square recess in that stem, a "Frenchman" to break a
plastic weld joint ? no fixings proper seen anywhere.

Which speaker element isn't working? Removing the tweeter support
should be unnecessary for either repair job.

Dual concentric speaker
 

spamtrap1888 wrote in message
...
On Jun 14, 12:42 am, "N_Cook" wrote:
Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to
be
a plastic stem passing through the bass cone, wires to it passing through
that cone also. How to remove the tweeter section to get to ,hopefully,
failing wiring joint that is normally covered by the dome of a single
normal
speaker. There is a square recess in that stem, a "Frenchman" to break a
plastic weld joint ? no fixings proper seen anywhere.

Which speaker element isn't working? Removing the tweeter support
should be unnecessary for either repair job.

+++++

Working unreliably but not with me of course, probably loss of bass if
speaker problem. Accessible joint at cone between a pigtail and
intermediary? wire was suspect but as it did not look like VC wire I assume
there is another join further in under a ring , access obscured by the
tweeter assembly.
Problem may also have been the "Recording Out" socket with 2 bypass switches
inside the Jalco 1/4 in socket. One reduces the speaker output and one cuts
speaker supply , via control (not carrying speaker current), I don't know
why , perhaps one functions with mono and other with stereo jack inserted
via pcb links (not seen as have not taken apart the whole amp). The closure
force on the reducing contact only about 200 gram compared to about 400 gram
on the full cut one

Dual concentric speaker
 

On Jun 14, 7:53*am, "N_Cook" wrote:
spamtrap1888 wrote in message

...
On Jun 14, 12:42 am, "N_Cook" wrote:

Roland cube , tweeter over the 10 inch bass unit. Stands on what seems to
be
a plastic stem passing through the bass cone, wires to it passing through
that cone also. How to remove the tweeter section to get to ,hopefully,
failing wiring joint that is normally covered by the dome of a single
normal
speaker. There is a square recess in that stem, a "Frenchman" to break a
plastic weld joint ? no fixings proper seen anywhere.

Which speaker element isn't working? Removing the tweeter support
should be unnecessary for either repair job.

+++++

Working unreliably but not with me of course, probably loss of bass if
speaker problem. Accessible joint at cone between a pigtail and
intermediary? wire was suspect but as it did not look like VC wire I assume
there is another join further in under a ring , access obscured by the
tweeter assembly.

What does the wire connecting to the pigtail on the cone look like, if
not voice coil wire?

Have you tried connecting an audio oscillator to the terminals that
the pigtails are connected to, and sweeping it?

If the tweeter was suspect, wire could be run from the tweeter across
the cone, and then down the frame to the mounting terminals, depending
where the series capacitor is mounted. Unless it's a piezo.

Problem may also have been the "Recording Out" socket with 2 bypass switches
inside the Jalco 1/4 in socket. One reduces the speaker output and one cuts
speaker supply , via control (not carrying speaker current), I don't know
why , perhaps one functions with mono and other with stereo jack inserted
via pcb links (not seen as have not taken apart the whole amp). The closure
force on the reducing contact only about 200 gram compared to about 400 gram
on the full cut one

Here you do not need to monkey with the tweeter support, obviously.