Originally Posted by russtler
I have the SC-09 in my HT rack, but am eyeing the SC-68...
I have a feeling that the old rule re power in relationship to spl may not be strickly applied to these class-D amps given their increased efficiancy compared to class A-B amps...
another susano owner! yes!
are you considering replacing the 09 or adding to it? I added to it
power - I don't know yet how the new 68 amps compare vs the 09. Walkamo @ Pioneer had told me that there's a bigger power supply in the 68 vs the 57 so the 68 gets a larger power rating & that Home Theater Mag may be reviewing one "soon". Don't know how soon is soon but I'm very interested in a bench test to see
the 57's power output rating was ~ same as the 09 with all 10 of the 09's amps in use but with all ch driven the 09 could still pump out more power. The 09's Ice power supply was 1400 watts & if you only used 7 channels, it could produce 7 x 200 watts. So, the increased power rating of the 68 vs the 09 may or may not be a wash. We'll have to wait for a review & test results to compare.
I do know that for these new amps, Pioneer finally has officially approved them for 4 ohm use & they do have lower total distortion in the middle part of the power curve due to the new design & simpler circuitry but will that be audible?
I can say that the new amp design seems to have a nice class A/B sound to my ears (whatever that is
) & that with all my 4 ohm magnepan speakers connected, even at very hi volumes, its sound seemed very smooth & par with a hi-powered, hi current design 2 ch amp I use (600@4ohms) that's saying something. If I had to put a subjective label on what it sounded like vs the Ice amps (ccotenj - you can ignore this
), I'd say a little less "edgy". How's that for "audio-fool" lingo?
To my ears, the Ice amps seemed a little brighter or edgier when really pushed hard, more so than the class A/B amp. This could be differences in MCACC tuning, the lower distortion, the higher sampling frequency in the amp design itself, or just my imagination
which is most likely the case
Here I am, going Michael Fremer on everyone
Amp efficiency isn't relevant to SPL tho. 100 watts from class D is the same as 100 watts from class A/B. A watt is a watt, and the SPL is determined not by the efficiency of the amp but the efficiency of the speaker
- how many dB's/ watt it produces.
What amp efficiency does effect is the power draw from the wall outlet needed to produce that watt of output. Typical class A/B amps are ~50% eff, while class D can be 80-90%. So it takes almost 2 x as much current for the A/B amp to produce that watt than the class D amp. That's the electricity savings part.
IF it weren't for several very unique features the SC-09 has that are very important to me, I could replace it with the 68 and not look back. That's why I am coming up with convoluted way to use both in my setup
For a normal sane person
I think the 68 can pretty well replace the 09, especially if you don't use ILink/PQLS or care about adding DSP to the analog multichannel inputs.
You will give up the pretty display but you'll have full-blown OSD instead, even over HDMI, including full setup menus, including changing audio/video parameters, something I really missed not being able to do with the 09. AND you'll get the i-control apps...easy to control it with it. All the connectivity, streaming & control options, have come a long way in 4 years. I was a bit surprised Edited by ss9001 - 9/7/12 at 9:09am