SDA-less

Joe08867

If you are not planning on using them As SDA's which once you hear them you will change your mind. If not sell them and get some regular speakers.

You are not using all the speakers in your SDA's right now. Just the tweeters and one driver per cab without the SDA cable.

CNWDI

jaygax wrote: »

thank you oliver for the reply. i'll just try to make the cable myself. anyway, i really wont be needing that cable that much since i have a 7.1 setup and my yamaha has various sound field effects called DSP. my SDAs will just have to be front left and right channels. but im still curious about that SDA effect.

Speaking as a EE who's owned SDA speakers since 1987...there's no DSP even in high-end consumer grade equipment that's likely to sound "better" than properly set up SDA. Obviously what sounds good to you will obviously be what matters--to each his own. But in my 7.1 setup, I A. have the SDA cable connected all the time B. turn off all the DSP modes for two-channel listening C. have had other folks who'd never heard SDAs before tell me that they'd sell the other (Polk LSi center/surround) speakers and just keep the SDA-CRS+ pair. So, your mileage may vary but don't discount SDA without hearing it. As Joe notes, right now there are drivers that aren't even playing in your existing speakers--adding a cable should be a cheap "upgrade".

im saving myself for a pair of RTi A7. those would really complement my yamaha and the 7.1 setup without worrying about the ohms load factor. SDA's got 4 ohms while most of the speakers now have 8. im just using my SDAs for the meantime. lastly, money is really a great factor in building a stable and ear satisfying home theater!

If money's a significant factor, I'd really hold off on the RTi A7 and first see what you have with the SDAs...

Schurkey

Joe08867 wrote: »

You are not using all the speakers in your SDA's right now. Just the tweeters and one driver per cab without the SDA cable.

Speakers are 2As, correct?

All drivers in the 2A are used even when SDA cable is not connected. Very similar wiring to the 1B, but with half the drivers, and some changes to the values of the caps and inductors and such. Only the very early SDAs had drivers that were completely dedicated to the dimensional circuit.

Without the cable, they shouldn't sound bad at all...Yes, it'll sound better (there will be some SDA effect) with the cable connected.

The 1Bs sound very similar with or without the SDA cable attached, the major difference being the lack of ESP (Extra-Speaker Presentation), where the soundfield extends beyond the outside edges of the speaker cabinets.



If the problem is that the amp/receiver won't appropriately drive a 4-ohm (nominal) speaker, the solution is more likely to be to dispose of the ampere-limited receiver for something that has an amplifier section that's designed properly.

Marty913

Schurkey wrote: »

If the problem is that the amp/receiver won't appropriately drive a 4-ohm (nominal) speaker, the solution is more likely to be to dispose of the ampere-limited receiver for something that has an amplifier section that's designed properly.

I agree completely with the above suggestion from Schurkey. According to Home Theater Magazine's recent testing of the Yamaha Aventage line your receiver doesn't have the strongest power supply around. Although rated at 105 it only generates 54 with 5 channels driven & probably less than 50 with 7 driven. It may not be the right receiver for 4 Ohm loads.