[Boatanchors] Speaker Question

[Revcom]

Mike,
You should have no problem using the speakers for about anything.  I use a 
Motorola Motrac speaker for a bench unit and hook it everything that comes 
in when need some sound.  Car audio/communications/enterainment stuff, etc. 
Just watch to not run it full blast open, one it can blow out speaker, and 
two might cause some heating in output of integrated solid state amps.

They, Motorola and GE, will handle quite a bit of power and are designed for 
voice range. As one mentioned the GE usually "sounds" better than the MTLA, 
esp the older ones.

If you are concerned about impedance match, just add a 4 ohm fixed resistor 
in series, works OK.

Rod
K0EQH

----- Original Message ----- 
From: "Michael D. Harmon" <mharmon at att.net>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, December 31, 2008 12:00 AM
Subject: [Boatanchors] Speaker Question


>I have a bunch of surplus Motorola mobile speakers, both the old 
>metal-cased units and the newer Micor-type plastic-cased units.  According 
>to everything I've been able to find, all these speakers are rated at 4 
>ohms (actually 3.2 ohms).  These speakers are excellent voice reproducers, 
>and the intelligibility is far better than a lot of the aftermarket (i.e. 
>Radio Shack) so-called mobile extension speakers.  The question I have is 
>this:
>
> Most communications receivers (like my Heath SB-102 and National NC-300) 
> specify their audio output at 8 ohms.   They all use tube-type audio 
> output stages with a small output transformer.  Will it damage these 
> receivers to drive a  4-ohm load?  Of course the waveform is a voice 
> signal, so the average power output is pretty low (plus with Motorola 
> speakers you don't need much power to hear them).
>
> If I were working with a stereo system or a musical instrument amp, I'd 
> find a speaker to match the output.  However, I have these speakers, and 
> I'd like to use them if they won't hurt my gear.
>
> Thanks for the help.
> Mike, WB0LDJ
> mharmon at att dot net
> _______________________________________________