MKtheater Posted March 19, 2015 Share Posted March 19, 2015 I was looking for a place to post. If they are wrong than the mic is bad. Quote Link to comment Share on other sites More sharing options...
MemX Posted March 19, 2015 Share Posted March 19, 2015 That AETechron 7560 looks like a beast! Quote Link to comment Share on other sites More sharing options...
Ricci Posted March 20, 2015 Share Posted March 20, 2015 That AETechron 7560 looks like a beast! Oh they were. NO low frequency roll off on those. They were supposed to be good up to 70kHz or something like that as well. I kind of regret selling the pair I had. But they were 5 rack spaces tall and 100lbs each and really needed a dedicated 20A line to each. Would've been great for mains or an IB system. I do have a few more loopbacks I can dig up and post I just have to figure out where I put those measurements. Quote Link to comment Share on other sites More sharing options...
Madaeel Posted March 20, 2015 Share Posted March 20, 2015 Holy hell! That is one big amp. Though once you get them into postion you typically don't ever move them again...unless it's a Sherbourn. That has got to be the best response so far. It actually has a hump at 5hz. Beautiful. Quote Link to comment Share on other sites More sharing options...
LTD02 Posted March 21, 2015 Share Posted March 21, 2015 road trip: https://sfbay.craigslist.org/nby/ele/4932551093.html Quote Link to comment Share on other sites More sharing options...
Ricci Posted March 23, 2015 Share Posted March 23, 2015 That's a great deal...if I remember right they will do 1 ohm as well. Note the scale on that graph. Not much of a bump. Probably a measurement artifact. Quote Link to comment Share on other sites More sharing options...
MemX Posted March 31, 2015 Share Posted March 31, 2015 Ok, so just pondering the possibilities of those crazy AETechron amps as a replacement for a (user-friendly) CV5000, wherein I'd need two (one to run each sub box at 2ohm) to replace the CV5000's stereo channels. To ask what I'm quite sure will be stupid questions... - I assume that with no ability to vary the gain (attenuation) in the amp itself (it looks like only the 7562 has an input attenuation knob) all gain modulation would need to be done by something before it in the chain? (MiniDSP?) - If so, how does one determine the suitable input voltage into the amp that will allow it to maximise output but with no clipping on the inputs? (Would a Balanced MiniDSP's 2V output be enough power?) - Was your amp expensive to repair when it broke? (mentioned here: http://www.hometheatershack.com/forums/av-home-theater/30031-equipment-failures-getting-acquainted-service-dept.html before you sold it here: http://www.hometheatershack.com/forums/classifieds-audio-equipment/36359-ae-techron-7560-monoblocks-picker-international-branded-pair.html!) - Are the fans noisy? They look it! - The PDF says that it has 'internal selection' of voltages (120v / 240v etc) (http://www.aetechron.com/pdf/7570.pdf) - does that mean it's automatic and doesn't have to be opened up? Apologies for the annoying questions Quote Link to comment Share on other sites More sharing options...
Ricci Posted April 1, 2015 Share Posted April 1, 2015 Yes it would be expensive to repair. Shipping 100lb amps is not cheap. Fans are loud yes. Input sensitivity specs should be listed at AeTechron along with schematics, etc. Quote Link to comment Share on other sites More sharing options...
MemX Posted April 1, 2015 Share Posted April 1, 2015 Yes it would be expensive to repair. Shipping 100lb amps is not cheap. Fans are loud yes. Input sensitivity specs should be listed at AeTechron along with schematics, etc. Thanks Ricci I'll have to get my technical head on and read the spec sheets properly this time lol Am considering taking a punt on getting one shipped over to the UK but it's not a cheap exercise if it is a broken unit! Quote Link to comment Share on other sites More sharing options...
lukeamdman Posted February 27, 2016 Share Posted February 27, 2016 Here's a couple amp frequency response comparisons I took today. The CC5500 is always the red line: CC5500 vs SP2-12K: CC5500 vs. XLS 2500: CC5500 vs. NU4-6000: CC5500 vs. LG IPD 2400: Quote Link to comment Share on other sites More sharing options...
NWCgrad Posted February 28, 2016 Share Posted February 28, 2016 The Crown did pretty well considering its reported 20 Hz HPF. It looks okay down to 10 Hz, I doubt anyone expected better results. Thanks Luke.... 1 Quote Link to comment Share on other sites More sharing options...
shadyJ Posted February 28, 2016 Share Posted February 28, 2016 Here are a couple computer sound interfaces if anyone cares: MOTU UltraLite mk3 Hybrid: Behringer U-Phoria UM2: Not bad for a $30 USB sound interface! Quote Link to comment Share on other sites More sharing options...
lukeamdman Posted May 28, 2016 Share Posted May 28, 2016 Peavey CS 4080HZ (red) vs. Crest CC4000 (blue) Quote Link to comment Share on other sites More sharing options...
lukeamdman Posted August 26, 2016 Share Posted August 26, 2016 Motu Ultralite AVB. Line out to mic in: Quote Link to comment Share on other sites More sharing options...
maxmercy Posted August 28, 2016 Share Posted August 28, 2016 -2dB at 2Hz is pretty darn good. JSS Quote Link to comment Share on other sites More sharing options...
andy497 Posted October 18, 2016 Share Posted October 18, 2016 I'm working on my signal chain and thought I could add a few data points here. I don't fancy sweeps, as I was using an oscilloscope to look for clipping/distorted waveforms. However, that saves me having to worry about my loopback measurements and a questionable soundcard. Here's the signal generator from REW out via hdmi into an Onkyo TX-NR809 receiver. screenshot of 5 hz: The yellow boxes at bottom are displaying period, frequency, Vpp, and Vrms. With AVR at maximum possible non-clipped output, I saw 22.5 Vpp (!) at the sub out. In the screenshot you can see that 5 hz was 20.2 Vpp, and also see the min values from 2.5 hz where it dipped to 15.3 Vpp. I make that 20 * log10(22.5 / 20.2) = roughly -1 dB at 5hz and 20 * log10(22.5 / 15.3) = roughly -3 dB at 2.5 hz. Interestingly, I could push the AVR crazy hot without clipping the output. The above measurements were taken with the master volume pegged at +18 and sub out at -2.5. Adding another half dB chops the waveform unmistakably. Because I assumed it would clip much sooner (my Onkyo TX 535 does), I had the sub out previously at -15 with lots of amp gain, since I regularly go above 0 master volume with music. It looks like I can get a bunch of SNR back. Unless I'm missing something and the AVR is not routing all the input signal to the sub preout. My AVR was reading multipcm in with REW running, but I couldn't tell exactly what channel(s) the signal generator widget in REW was outputting to. I'll next try to see if I can grab an actual full sweep into the scope from REW where I know I'm outputting on exclusively the sub out channel. That leads me to my next concern, which is that I don't clip my minidsp inputs. I can adjust my AVR down a bit to not exceed the balanced minidsp 4 Vrms max in, but I don't know if/what effect bass management has. More testing required... Also, I measured my Onkyo TX 535 upstairs and saw similar rolloff results --I think it was 1.5 dB down at 3 hz. Its preout was even hotter - up to 27.4 Vpp or 9.6 Vrms before clipping. 1 Quote Link to comment Share on other sites More sharing options...
SME Posted October 18, 2016 Share Posted October 18, 2016 This is good news for Onkyo users. IMO, you don't even need an O-scope to do this kind of testing if you have a downstream gain control you can adjust. Turn that downstream gain down real low so that your extreme test signals are played at a modest level. Play a sine tone, and listen while you increase the gain on the device you are testing. Even a tiny bit of clipping is very audible when you are listening to pure sine waves. For example, the RMS level of a sine wave is -3.0103 dB below the peak. In REW, the level specified in the sine tone generator is dB RMS relative to full-scale, so "-3 dB" clips very slightly, by 0.0103 dB. And I can easily hear this clipping in a pure sine wave. You probably can to. Quote Link to comment Share on other sites More sharing options...
andy497 Posted October 19, 2016 Share Posted October 19, 2016 ... For example, the RMS level of a sine wave is -3.0103 dB below the peak. In REW, the level specified in the sine tone generator is dB RMS relative to full-scale, so "-3 dB" clips very slightly, by 0.0103 dB ... That's really interesting about -3 dB in REW. That's typically where I've been measuring. This scope has a half-way decent FFT function, so I'll be interested to see if I can see that as THD in the output compared to -3.5 or -4, though I suspect you could do this more accurately in REW. Now I know to listen for it too. Quote Link to comment Share on other sites More sharing options...
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