SDA SRS 2 need CPR and ICU life support

[heartystatue]

Wow Proffitt I just read this entire thread and I applaud you. Especially for not ever hearing these before you started. Outstanding job and a lot of excellent help from everyone. So much info in this club.

[proffitt]

Hearty statue- you are spot on about the help and expertise here in this group! If you read the entire thread (which turned out to be quite a book.... You saw that I couldn't have done it without this group. Thanks for the props and compliment. It was a fun project and VERY rewarding. Kept me busy and in the basement shop late nights through the holidays ( fun for me)... And it even was the catalyst for teaching my two young sons (7 & 9) how to solder, even though the 7 year old burned himself a little. But he'll only do that once!

Thanks though. I'd do it again in a heartbeat. Still loving them. Still hoping to help out the next guy that takes it on.

[proffitt]

Still sounding great. Time to start thinking about center channel to match them in a 7.1 HT system. So if these guys are amped with ext. amp in the 150/200 wpc range... 1) what center channel would be a good match to them? And 2) would I be able to get away with powering the center with 100 watts directly from the AVR? Or need to ext amp it too? Currently the fronts are pre-outed from the AVR. And all other channels to be amplified outs from the AVR.
Thoughts?

[Schurkey]

If the AVR supplies clean power, and your center/surround speakers don't present too low of an impedance, I don't know why you couldn't run the center (and surrounds) directly from the AVR. I'd expect the AVR has gain compensation to match the loudness of the main L and R. (Truth to be told, I run my center channel considerably louder than the main L and R, because otherwise the spoken dialog isn't appropriately intelligible.)

[PolkieMan]

I first got a CS2 but it just didn't sound right. Then I was told a CS400 and Polk told me (on the Facebook page) a CSia6 is a good match. I got a CsiA6 for $250 from newegg great match later found out a CsiA5 is about the same just older model. The AVR should be enough for front and 2 surrounds

[proffitt]

I'm still looking for a respectable amp to power my pair (SDA SRS 2).

I've run across two Harman Kardons that look interesting in the $300 range. Any preferences on the Citation 22 versus the PA-2400?
Is $300 a decent price, used?
Are they common ground, as needed for these speakers?

Thanks for any insight!

[proffitt]

I'm reading that the HK Citation 22 is a "dual mono amp". Does that mean that it is not common ground?

[Schurkey]

I'm reading that the HK Citation 22 is a "dual mono amp". Does that mean that it is not common ground?

Maybe. Aragon advertises "Dual Mono"; but it's really only on the + side, the negative side is either common-ground or common-ground with some resistance. The 8008BB has ~20 ohms between the channels, bypassable with a foot of jumper wire connecting the two channels at the negative binding posts.

Dual-mono CAN mean separate negative-side grounds, but it doesn't have to.

[proffitt]

Thanks for the input Schurkey. If I go look at this amp I'll take my DMM and measure. True Common Ground will give me little or no resistance. Or you say "some resistance". Do you have an idea of a level of resistance that it would be unacceptable? When I measure, how do I know if its good for my speakers or not?
Thanks very much!!!

[proffitt]

OK, measured amp. Common ground showing .5 ohm resistance. Bought the amp. NIIIIICE!!!! Its in good shape. He "said" it was rarely used. I just happen to believe him.