Speaker AB Switch

I want to test some speakers with my M125's and therefore need a speaker AB switch. I already know the AB switch is going to impact the sound, but it will give me a relative comparison between my Forte' IIs and Definitive Technology BP9060 speakers. I promise not to leave the switch permanently installed.

So, my concern is finding a switch that will provide a load to the amps while switching. Does anyone make such a switch? Some have suggested add a resistor between the 8 ohm post and the ground, can this be left permanently? Is there a downside to leaving the resister installed?

Thanks for any help you can provide,
Rick

rwbaker wrote:I want to test some speakers with my M125's and therefore need a speaker AB switch.  I already know the AB switch is going to impact the sound, but it will give me a relative comparison between my Forte' IIs and Definitive Technology BP9060 speakers.  I promise not to leave the switch permanently installed.

So, my concern is finding a switch that will provide a load to the amps while switching.  Does anyone make such a switch?  Some have suggested add a resistor between the 8 ohm post and the ground, can this be left permanently?  Is there a downside to leaving the resister installed?

Thanks for any help you can provide,
Rick

If you want to switch speakers during load you should have a make-before-brake type. This will connect both speakers a short while before disconnecting one.
Using a switch that breaks-before-make will have the amp unladed for a short while and that might cause flash-over and possibly damage the amp.

If you insist on using a break-before-make you could solder a 100 ohm resistor between the 16 ohm tap and ground ( and leave it there.)

something like this should work fine
https://www.amazon.com/Monoprice-108231-Speaker-Selector-Control/dp/B007N43T5Y
to be sure you always have a load on the amp, I would either add a resistor from the 8 or 16 ohm taps to ground (100-220 ohms 2w)
and make sure at least one pair of speakers is always connected

Peter, what wattage for the 100 ohm R ? Dale

Dale Stevens wrote:Peter, what wattage for the 100 ohm R ?   Dale

5w is ok.