Originally Posted by Ricci
Guys this Crown hpf at 20hz talk is nonsense. I dont care what whoever at Harmon support said. The Itechs, MA series and CE series all have a 3rd order 8Hz hpf which is about 3 dB down at 8Hz. There are measurements of a plethora of other Crown amps floating around and I have yet to see a single one with a 20Hz 24dB hpf.
Can anyone produce one?
It's important to understand of course what you've asserted as "nonsense" is not what's being contended.
You seem to have missed the crucial point of this being related to current/recent model amplifiers as you have listed amplifiers that were discontinued years ago. Both techs I spoke with said "older" Crown amplifiers did not employ such an hpf so it's not surprising of course that the models you listed are a-ok in this regard.
Crucially though, the ONLY recent example I can think of that was benched was the xti chuck tested and it was absolutely miserable at 20hz, fwiw.
If there would be one current exception though I'd expect it to be the astronomically priced I techs...matter of fact the tech I spoke with said he THINKS the itech may have a defeatable hpf.
I know this: when I run a 20hz sine on my 4002 the output is ridiculous, when I don't change a thing and run a 10, output is through the floor. Of course you'd have output even with a 24db slope, but it would be down, well, 24dbs as it seems with mine. I can measure tomorrow.
I simply do not see why multiple crown techs would actively and knowingly spread false information with so much confidence. The gentleman I spoke with, Kevin, seems to have a pretty strong engineering background and didn't sound like he was just pulling things out of the air.
JamesEdited by mastermaybe - 4/5/13 at 7:03pm