[Icom] external speaker for IC 746

[George, W5YR]

Tom, try the MS-4 with another radio or any audio source and make sure that
it is OK.

I have used them for years and never had one that sounded bad. The symptom
you describe though sure sounds like a speaker with a stuck or badly
dragging voice coil. Very strong signals could actually drive the coil up
against the madnet hard enough to temporarily jam it and that could account
for the lack of sound. Since you internal speaker sounds ok, that pretty
well points to the MS-4 as the culprit.

Don't toss a brick at me, but if you have the 746 manual, it might shed
some light on the hookup of that jack as well as make a speaker
recommendation.

72/73/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771
Icom IC-756PRO #02121  Kachina #91900556  IC-765 #02437

All outgoing email virus-checked by Norton Anti-Virus 2002


Tom Johnson wrote:
> 
> Earlier today, I asked if anyone knew if the speaker connection on the rear
> of the 746 was mono or stereo. The unanimous consensus was  that it is mono.
> 
> I hooked it up using a mono jack, and ran it through a Timewave DSP 9+ to a
> Drake MS4 speaker. The signal began cutting out on loud signals, and at
> times, sounded very tinny. I have 2 of these and tried both, with no change
> in the problem. I then took the DSP 9+ out of the circuit and ran the cable
> directly to the MS4, with the same results. Unplugging everything from the
> rear speaker plug and using the internal speaker results in normal sounding
> signals.
> 
> The purpose of the Timewave was to give me an outboard method of controlling
> the speaker as well as the audio enhancement feature of the unit. I need the
> external speaker due to the need to place some things on top of the 746
> cabinet.
> 
> Has anyone else had such an experience and / or any ideas on what's going
> on? Could this be in the rear speaker plug?????
x