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post #1201 of 1783 Old 11-22-2016, 05:04 AM
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Do you have all of these tests collected in one place? @notnyt


I've been somewhat following along but I'd love to be able to reference measurements without having to dig through this thread.
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post #1202 of 1783 Old 11-22-2016, 05:21 AM - Thread Starter
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Originally Posted by JohnDean View Post
Do you have all of these tests collected in one place? @notnyt


I've been somewhat following along but I'd love to be able to reference measurements without having to dig through this thread.
at some point going to put up a website with all the info but haven't gotten that far
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post #1203 of 1783 Old 11-22-2016, 05:54 AM
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gotta catch up on some things, got a new pc coming for my bench since there was just a deal on the high end nuc. My laptop I was using was having issues, so that should be here in a couple days. I have an enhanced fp14000 I bought to test, which I ran some basic tests on. Definitely better than the sanway, but haven't done full work up. Not rushing on that, though. I also need to test my speaker power amps at some point,



If someone wants to send me an ipr2 7500 or anything else I'll test it, but it might be a couple weeks before results between holiday and work stuff.


Not I have a Peavey IPR7500 sitting around that you could test. I'm really not using it currently anyways. Let me know if you want it for testing.
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post #1204 of 1783 Old 11-22-2016, 05:55 AM - Thread Starter
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Not I have a Peavey IPR7500 sitting around that you could test. I'm really not using it currently anyways. Let me know if you want it for testing.
what's the difference between the ipr and ipr2?
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post #1205 of 1783 Old 11-22-2016, 05:58 AM
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what's the difference between the ipr and ipr2?


Sorry mine is the IPR2-7500.
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post #1206 of 1783 Old 11-22-2016, 06:01 AM - Thread Starter
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Sorry mine is the IPR2-7500.
Will send you an email
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post #1207 of 1783 Old 11-24-2016, 12:53 AM
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Originally Posted by notnyt View Post
gotta catch up on some things, got a new pc coming for my bench since there was just a deal on the high end nuc. My laptop I was using was having issues, so that should be here in a couple days. I have an enhanced fp14000 I bought to test, which I ran some basic tests on. Definitely better than the sanway, but haven't done full work up. Not rushing on that, though. I also need to test my speaker power amps at some point,

If someone wants to send me an ipr2 7500 or anything else I'll test it, but it might be a couple weeks before results between holiday and work stuff.
Couple weeks? Damn man.... impressed. It'll take me two weeks to simply focus long enough to make the purchase.

Curious to see what happens with the IPR2. If any party involved needs a few bucks towards shipping PM me a paypal and I'll contribute.
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post #1208 of 1783 Old 11-24-2016, 01:28 AM - Thread Starter
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Couple weeks? Damn man.... impressed. It'll take me two weeks to simply focus long enough to make the purchase.

Curious to see what happens with the IPR2. If any party involved needs a few bucks towards shipping PM me a paypal and I'll contribute.
tsloms sending the ipr2 7500 so might want to poke him if you want to contribute
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post #1209 of 1783 Old 11-24-2016, 01:32 AM - Thread Starter
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also, just ditched my laptop and setup a quad core nuc on my bench. omg so much faster. bye bye 2008 macbook. in other productive news, managed to hang 24 feet of corner traps in my theater a few minutes ago as well
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post #1210 of 1783 Old 11-24-2016, 02:12 AM
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Originally Posted by notnyt View Post
also, just ditched my laptop and setup a quad core nuc on my bench. omg so much faster. bye bye 2008 macbook. in other productive news, managed to hang 24 feet of corner traps in my theater a few minutes ago as well
Can you post pics of your room treatments?
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post #1211 of 1783 Old 11-24-2016, 02:44 AM - Thread Starter
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Can you post pics of your room treatments?
It's all in first link in my sig... just put these up tho..

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post #1212 of 1783 Old 11-24-2016, 09:37 AM
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Those look great Not, and effective. Very nice!

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post #1213 of 1783 Old 11-24-2016, 09:44 AM
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It's all in first link in my sig... just put these up tho..

Looking good.

I need to absorb my entire back wall but I've been lazy.
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post #1214 of 1783 Old 11-24-2016, 10:24 AM - Thread Starter
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Those look great Not, and effective. Very nice!
wasn't sure how I was going to hang them and how useful they'd be. I've had em for like a year and a half just taking up space.. They did very well and killed some not so good echos

Also, the claire adhesive was ****, had to rehang with 3m :/
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post #1215 of 1783 Old 11-24-2016, 02:37 PM
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So you hung them with adhesive only? Which one? Do you have a side view picture of the treatments? Thanks.

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post #1216 of 1783 Old 11-24-2016, 02:50 PM - Thread Starter
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So you hung them with adhesive only? Which one? Do you have a side view picture of the treatments? Thanks.
used 3m super 77 to hang em after the claire crap failed. spray only

http://www.homedepot.com/p/3M-Super-...7-24/100067550

It's just these ats corner traps.. I think when I bought them they recommended claire adhesive... which was garbage. I see they have 3m on their site now. I had a can on my shelf in the shop since the stuff is amazing, always have some handy, worked way better.

http://www.atsacoustics.com/acoustic...bass-trap.html
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post #1217 of 1783 Old 11-25-2016, 10:18 AM
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Man, I remember when my room was 100% that stuff, I had a anechoic chamber! Very eerie sounding but better than one would think.

Building the room, speakers, and subs.
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post #1218 of 1783 Old 12-01-2016, 05:11 PM - Thread Starter
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some prelim results for the ipr2-7500. I'll do more official testing and pics when I get more time. @tsloms @pdxrealtor

It will burst 3500w x2 @ 50hz into 2.3 ohms.

It will sustain 2500w total for about 10 seconds before tripping its breaker

It will sustain 4200w total for about 5 seconds before tripping its breaker

Things I noted:

The fans don't spin up when its under load. Seems to be a design flaw. After clearing the load, the fans then ramp up.

They don't have any real electronic protection, just a breaker at the back of the amp. I generally see this trip, then see some possible protection in the form of muting after I turn it back on. I think I saw it mute once without tripping the breaker, but I just happened to cut the signal right before the breaker tripped.

The outputs are already bridged, so no more bridging is possible.

While not a bad amp, I'd still go for a clone at about the same price, they perform better into higher impedance loads, sustain more power, have more burst potential, can be bridged, and don't shutdown as easily. On the flip side, this smokes the inuke 6000's, and it can drive a 2 ohm load and actually has some burst potential.

This amp can legit burst 7500w into 2 ohm loads.
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post #1219 of 1783 Old 12-01-2016, 06:41 PM
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Originally Posted by notnyt View Post
some prelim results for the ipr2-7500. I'll do more official testing and pics when I get more time. @tsloms @pdxrealtor

It will burst 3500w x2 @ 50hz into 2.3 ohms.

It will sustain 2500w total for about 10 seconds before tripping its breaker

It will sustain 4200w total for about 5 seconds before tripping its breaker

Things I noted:

The fans don't spin up when its under load. Seems to be a design flaw. After clearing the load, the fans then ramp up.

They don't have any real electronic protection, just a breaker at the back of the amp. I generally see this trip, then see some possible protection in the form of muting after I turn it back on. I think I saw it mute once without tripping the breaker, but I just happened to cut the signal right before the breaker tripped.

The outputs are already bridged, so no more bridging is possible.

While not a bad amp, I'd still go for a clone at about the same price, they perform better into higher impedance loads, sustain more power, have more burst potential, can be bridged, and don't shutdown as easily. On the flip side, this smokes the inuke 6000's, and it can drive a 2 ohm load and actually has some burst potential.

This amp can legit burst 7500w into 2 ohm loads.
Nice @notnyt !! - damn that was fast. Thx @tsol ms for sending it in.

Not - double checking the sustained power output is both channels so your numbers above would divided by 2. 1250 per channel for ten seconds, 2100 per channel for five seconds?

Did you or do you plan to look at performance one channel driven? I'm curious how much more the power supply can dish out one channel vs. two channels.

Odd thing with the fans. I want to say mine always ramped up as the material got hotter. I think even with nothing being output the fans would still ramp up based on the input signal. Can't be for sure on that though.
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some prelim results for the ipr2-7500.....

Nice. Good numbers. Thanks for the info not.
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post #1221 of 1783 Old 12-01-2016, 09:07 PM - Thread Starter
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Not - double checking the sustained power output is both channels so your numbers above would divided by 2. 1250 per channel for ten seconds, 2100 per channel for five seconds?
right. Also, the fans spin up when there's a lower level signal, but not when there's a higher level signal, it's like they don't receive the required voltage.

Last edited by notnyt; 12-02-2016 at 05:48 AM.
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post #1222 of 1783 Old 12-02-2016, 11:18 AM
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In running the ipr2 and crest 7.5 (big brother by 4 1100uF caps vs 600uF in the peavey) I always was able to power cycle the amp when I ran it in 2 ohm stereo. I don't recall any breakers internal and there certainly isn't one external on my unit though. Very interesting.
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post #1223 of 1783 Old 12-02-2016, 11:22 AM - Thread Starter
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In running the ipr2 and crest 7.5 (big brother by 4 1100uF caps vs 600uF in the peavey) I always was able to power cycle the amp when I ran it in 2 ohm stereo. I don't recall any breakers internal and there certainly isn't one external on my unit though. Very interesting.
on the ipr2 there's an external breaker right below the plug. The crest doesn't seem to have this. I want to test one of the crests at some point, but unless there's more than just capacitor changes, it will ultimately be limited by its efficiency.
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post #1224 of 1783 Old 12-02-2016, 11:26 AM
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In running the ipr2 and crest 7.5 (big brother by 4 1100uF caps vs 600uF in the peavey) I always was able to power cycle the amp when I ran it in 2 ohm stereo. I don't recall any breakers internal and there certainly isn't one external on my unit though. Very interesting.
Wasn't your cycling issue determined to be a thermal shutdown?
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post #1225 of 1783 Old 12-02-2016, 11:35 AM
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on the ipr2 there's an external breaker right below the plug. The crest doesn't seem to have this. I want to test one of the crests at some point, but unless there's more than just capacitor changes, it will ultimately be limited by its efficiency.
Looking at them both side by side, that was it, just the cap changes which likely only helps with their sustained power by what, another 2-3ms? Lol.

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Wasn't your cycling issue determined to be a thermal shutdown?
It was never definitive, only assumed it was thermally shutting down, but alas, even the crest guys didn't really have an answer.
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post #1226 of 1783 Old 12-12-2016, 03:00 PM - Thread Starter
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Just tested nu3000dsp real quick at 30 and 40hz... It'll burst like 1600w into 4r bridged, and sustain it for a couple of seconds before going into protect... nothing shocking here... Mine is fan modded, but I don't think even a non modded version will sustain much longer. I get between 5-10 seconds on mine at a full 1kw output before protect.
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post #1227 of 1783 Old 12-12-2016, 03:11 PM
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Just tested nu3000dsp real quick at 30 and 40hz... It'll burst like 1600w into 4r bridged, and sustain it for a couple of seconds before going into protect... nothing shocking here... Mine is fan modded, but I don't think even a non modded version will sustain much longer. I get between 5-10 seconds on mine at a full 1kw output before protect.
With a sine wave?

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post #1228 of 1783 Old 12-12-2016, 03:13 PM - Thread Starter
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With a sine wave?
same as all the rest... cea2010 for burst before it's visibly bad, and sine for sustained.
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post #1229 of 1783 Old 12-12-2016, 03:35 PM
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same as all the rest... cea2010 for burst before it's visibly bad, and sine for sustained.
I've e-mailed with Don Keele about this. The CEA-2010 tones have a crest factor of 7.3 dB for a single burst, but if you play them continuously, the crest factor goes way up. For example, a 1 kHz tone played continuously has a crest factor of 29.1 dB. Unlike sine waves, the crest factor varies with frequency. You can't use the peak number and come up with RMS. The Vrms of these signals is so low just about anything can play them. The CEA-2010 tones are designed to test subwoofers.

CEA-2006 burst tones are designed for testing amplifiers. For the burst tests, distortion also has to be measured and can't exceed 1% THD. The Common Amplifier Format and Audioholics using CEA-2006 bursts for testing of amps.

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post #1230 of 1783 Old 12-12-2016, 04:10 PM - Thread Starter
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Originally Posted by desertdome View Post
I've e-mailed with Don Keele about this. The CEA-2010 tones have a crest factor of 7.3 dB for a single burst, but if you play them continuously, the crest factor goes way up. For example, a 1 kHz tone played continuously has a crest factor of 29.1 dB. Unlike sine waves, the crest factor varies with frequency. You can't use the peak number and come up with RMS. The Vrms of these signals is so low just about anything can play them. The CEA-2010 tones are designed to test subwoofers.

CEA-2006 burst tones are designed for testing amplifiers. For the burst tests, distortion also has to be measured and can't exceed 1% THD. The Common Amplifier Format and Audioholics using CEA-2006 bursts for testing of amps.
I'm not continuously playing the burst tones. I'm using the p-p numbers from the 2010 burst for peak numbers, the sustained numbers I posted are from sine wave output. cea-2006 might work better for higher frequencies, but for measuring burst at low frequencies its useless.
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