MarkM

Thanks Dan One quick followup for now. Is the impedance ratings of the satellie test an exact match to the combined satellites impedance? When I look at the tests that Sound and Vision using on the amplifiers it's 4 and 8 to generally match the common impedance ratings of the hi-fi speaker system, hence my question. I also wonder about the rationale of using such a low impedance on the sub channel under test. Is the sub driver impedance that low or some other more realistic real world simulation? Thanks! ------------------ Mark Muschett 3DsoundSurge www.3dsoundsurge.com

This is as question posted here for DanF as per his request. There is a somewhat heated discussion ongoing in the 3DSS forum, part of which involves the RMS ratings of the ProMedia 4.1. As you know there are no standards for how multimedia speaker RMS rating are measured and it's clearly different than how the hi-fi amps/subs are measured in many if not all cases. The question is simple. Exactly what does the 400 Watts RMS rating mean. I.e. is it one channel driven, two channels driven, all channels driven? What test frequency was used and if it was the FCC frequency how does that account for the subwoofer rating? I.e was the sub and sats driven at the same time? What was the THD cutoff for the rating? Was it somewhere less than 1 percent, 1 percent or the 10 percent that many (most) multimedia speaker specifications use? You get the idea Part two of the question is the sub setup. I have been working with the ProMedia 2.1 and 4.1 sub and I had an easy time flattening out the ProMedia 2.1 for far field frequency response testing and I can't do it for the 4.1 sub (there is a big spike in the 50-70 Hz range in my room). What's the recommended placement in a 12 x 12 room to get performance that is as neutral possible and ideally as neutral as the Promedia 2.1 subwoofer. That's it for now. For anyone wanting to join in the discussion (but keep it sane please!) the original thread is at http://www.3dsoundsurge.com/ubb/Forum4/HTML/001700.html Mark Muschett 3DsoundSurge www.3dsoundsurge.com