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post #1381 of 1783 Old 12-04-2017, 11:41 AM
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Originally Posted by MKtheater View Post
Want to sell one of your amps?
Sure its just sitting there in the box..
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post #1382 of 1783 Old 12-04-2017, 12:05 PM - Thread Starter
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Fp measurements up next?!
I measured the only thing anyone cares about from them, max power

I have a bt enhanced fp14k sitting here still. I can run some sweeps on it at some point.
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post #1383 of 1783 Old 12-04-2017, 12:18 PM
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Originally Posted by notnyt View Post
I measured the only thing anyone cares about from them, max power

I have a bt enhanced fp14k sitting here still. I can run some sweeps on it at some point.
Yeah it would still be cool to see max power over frequency bands, sustained, and also THD.. But its only been since March and I know your busy..
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post #1384 of 1783 Old 12-04-2017, 12:25 PM - Thread Starter
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Originally Posted by Jason kiDD View Post
Yeah it would still be cool to see max power over frequency bands, sustained, and also THD.. But its only been since March and I know your busy..
I posted the info for the sanway fp14k earlier. The older ones sustain like 2800 or so, newer ones 3800. The BT enhanced will put out 4800 for a little under 2 seconds then about 3800.

4.4ohms bridged sanway fp14000

Hz Vpp burst Burst Watts
5 504 7214
10 584 9686
20 624 11058
30 632 11344
40 680 13132
80 728 15052
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post #1385 of 1783 Old 12-04-2017, 12:33 PM
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Originally Posted by notnyt View Post
I posted the info for the sanway fp14k earlier. The older ones sustain like 2800 or so, newer ones 3800. The BT enhanced will put out 4800 for a little under 2 seconds then about 3800.

4.4ohms bridged sanway fp14000

Hz Vpp burst Burst Watts
5 504 7214
10 584 9686
20 624 11058
30 632 11344
40 680 13132
80 728 15052
okay awesome thanks for all the hard work of course...
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post #1386 of 1783 Old 12-05-2017, 01:36 PM
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What are the 8 ohm numbers bridged?

Building the room, speakers, and subs.
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post #1387 of 1783 Old 12-05-2017, 02:38 PM - Thread Starter
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Originally Posted by MKtheater View Post
What are the 8 ohm numbers bridged?
Didn't test, but since those numbers are primarily current limited, you're looking at at around 7-8kw.
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post #1388 of 1783 Old 12-06-2017, 12:06 PM
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Didn't test, but since those numbers are primarily current limited, you're looking at at around 7-8kw.
I'm patiently waiting your test on the Botai enhanced FP14000
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post #1389 of 1783 Old 12-06-2017, 12:12 PM
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Originally Posted by dB_Max View Post
I'm patiently waiting your test on the Botai enhanced FP14000
Sorry the quote is a mistake..... don't know how that got in to the post
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post #1390 of 1783 Old 12-06-2017, 12:14 PM
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Sorry the quote in the previous post is a mistake.......don't know how that got in to the post
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post #1391 of 1783 Old 12-08-2017, 10:37 AM
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Quote:
Originally Posted by notnyt View Post
I posted the info for the sanway fp14k earlier. The older ones sustain like 2800 or so, newer ones 3800. The BT enhanced will put out 4800 for a little under 2 seconds then about 3800.

4.4ohms bridged sanway fp14000

Hz Vpp burst Burst Watts
5 504 7214
10 584 9686
20 624 11058
30 632 11344
40 680 13132
80 728 15052
Why do amps have such a hard time with lower frequencies? Does it have anything to do with DC?
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post #1392 of 1783 Old 12-08-2017, 10:38 AM - Thread Starter
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Originally Posted by murphy2112 View Post
Why do amps have such a hard time with lower frequencies? Does it have anything to do with DC?
The signals are more demanding. Each cycle of 5hz is 200ms. Each cycle of 50hz is 20ms.
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post #1393 of 1783 Old 12-16-2017, 11:40 PM - Thread Starter
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Not quite an amplifier, but figured it'd be worth testing.

So here's the cleanest interface I've seen yet, the MOTU 8a (which performs pretty much identically to the 1248 and the 16a). Tests looped into itself, and then into the RTX6001 analyzer.

0.000025% THD and 0.0002% THD+N

The best THD+N performance was at about 10v out. Best THD performance was just under 1v out.

MOTU 8a looped into itself







MOTU 8a into RTX6001








Going to test the RME UFX+ next, but I don't want to pull it out of my rack. Will have to move the test gear over to it, but that's another day.
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Last edited by notnyt; 12-17-2017 at 01:16 AM.
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post #1394 of 1783 Old 12-19-2017, 03:17 PM
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Here is my MOTU 624 looped:

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post #1395 of 1783 Old 12-19-2017, 03:19 PM - Thread Starter
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Originally Posted by desertdome View Post
Here is my MOTU 624 looped:
A bit of that distortion comes from the a/d. The a/d also has a bunch of hf noise. The 624 is in the same family as the 8a, both perform really well.

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post #1396 of 1783 Old 02-01-2018, 07:04 PM - Thread Starter
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new little guy on the bench. Connex IRS2200SMPS. Tiny little mains powered thing. Measured best of 0.0005% THD and 0.004% THD+N at 1khz into 8 ohms on the test bench so far. 0.01% THD+N at 1w into 8 ohms, 0.015% at 4 ohms.



Very efficient, very quiet. This will likely be my test amp for the bench, and will pick up another two for my surround//side channels.

Detailed measurements coming at some point.

1w into 8 ohms. It's no hypex, but it's not bad.
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post #1397 of 1783 Old 02-01-2018, 08:27 PM
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Does it come in a finished box? Or is it just the board?
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Does it come in a finished box? Or is it just the board?

http://connexelectronic.com/product/irs2200smps/

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post #1399 of 1783 Old 02-02-2018, 02:25 AM - Thread Starter
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Connex IRS2200SMPS

http://connexelectronic.com/product/irs2200smps/


pros: cheap, high efficiency, small, decent power output, balanced

cons: slightly rising frequency response above 10khz at 8 ohms, bit of HF distortion when pushed.









frequency response...



Distortion 8 ohms...









Distortion 4 ohms...










IMD


current draw...


1khz square wave...
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post #1400 of 1783 Old 02-03-2018, 11:39 AM
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I'd try to find someone to fix the IPR2-7500 for cheaper to start with. Which xxx18s do you have? What's the impedance?

Also where are you getting the ipr2-7500 for $700? That's a good deal.
I agree with Not on getting the IPR2-7500 foxes if you can ensure it would be fixed to like new.

Regarding amps FOR SUBS, I’m not at all impressed by the iNukes since they lack power down deep. The best subwoofer amps on the market are the SpeakerPower SP2-8000 (120V) or SP2-12000 (240V). However those are almost double the price of the IPR2-7500. So for most users for subs, I recommend the Peavey IPR2-7500 (DSP) or the slightly better sister amp in the Crest Prolite 7.5 (DSP). Those amps would give you about 80-90% of the capability of the SpeakerPower amps for about half the cost.
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post #1401 of 1783 Old 02-03-2018, 12:02 PM - Thread Starter
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I agree with Not on getting the IPR2-7500 foxes if you can ensure it would be fixed to like new.

Regarding amps FOR SUBS, I’m not at all impressed by the iNukes. The best subwoofer amps on the market are the SpeakerPower SP2-8000 (120V) or SP2-12000 (240V). However those are almost double the price of the IPR2-7500. So for most users for subs, I recommend the Peavey IPR2-7500 (DSP) or the slightly better sister amp in the Crest Prolite 7.5 (DSP). Those amps would give you about 80-90% of the capability of the SpeakerPower amps for about half the cost.
The PL7.5 / IPR2-7500 are definitely way better than the inukes, and are on my short list. They can run lower impedance loads and output double the power. Efficiency is much better as well. I don't know about that 80-90% of a speakerpower amp part... The IPR2-7500 run out of steam around 5kw... one channel of an sp2-12000 will outperform that... I think Luke measured like 8kw of output from one of those for sustained for a some seconds.

The speakerpower amps are definitely the way to go if you can put a low impedance load on them and have the budget. The PL7.5 is also a good choice. A clone will manage similar sustained output to the pl7.5, but it can do so with a higher impedance load and have another 3-4db of burst capability over it. Obviously there are drawbacks to the clone amps, but they're serious performers.

All that said, all the amps listed above aside from the speakerpower units are loud. I've yet to have the fans in my SP2-12000 even spin up. If you have the amps in their own room, not a problem.

My personal order of preference would be
1) SP2-12000 / SP2-8000 depending on electrical availability. the 8000 is more efficient by a few percent (~5) and can run on 120v, the 12000 requires 240 for full performance.
2) Smiths FP14000 clone
3) PL7.5 then IPR2-7500

If you were to group these in dollar to watts, it'd be ordered 2, 3, 1.

Honorable mention to the Powersoft K20 and K10, which are great as well, but they price themselves out of competition. They also sound like they're going to take off with all the 1U high rpm fans.
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post #1402 of 1783 Old 02-03-2018, 12:23 PM
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Thanks Not. I was trying to be nice to the IPR2-7500 by saying 80-90% since I do use them in my products, I didn’t want to be too partial. So I’ll defer to your measurements although in some testing head to head in anecdotal real-world tests, the IPR2-7500 availed itself pretty well but gave up before the SP2-8000 running the same HS-24 sub. This was at Beast’s GtG several years ago. So overall, especially for the money, the IPR2-7500 is quite capable. I really don’t consider the clones due to UL issues in case of fire.
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post #1403 of 1783 Old 02-03-2018, 12:26 PM - Thread Starter
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Thanks Not. I was trying to be nice to the IPR2-7500 by saying 80-90% since I do use them in my products, I didn’t want to be too partial. So I’ll defer to your measurements although in some testing head to head in anecdotal real-world tests, the IPR2-7500 availed itself pretty well but gave up before the SP2-8000 running the same HS-24 sub. This was at Beast’s GtG several years ago. So overall, especially for the money, the IPR2-7500 is quite capable. I really don’t consider the clones due to UL issues in case of fire.
Depending on the load, the IPR2-7500 may end up closer to the SP2-8000. Examples given earlier were with optimized loads on them. If you're using 3-4 ohm loads, it's much closer.
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I was looking at the Connex CxD 500 boards to try on my Crowsons a while back, but I thought they might be a bit skimpy on power and might have issues at very low frequencies. Thanks for sharing the test. I still have an empty amp chassis that I never populated, and perhaps now is a time to revisit my amp projects. Why did you pick that integrated one over the other boards like the CxD?

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I was looking at the Connex CxD 500 boards to try on my Crowsons a while back, but I thought they might be a bit skimpy on power and might have issues at very low frequencies. Thanks for sharing the test. I still have an empty amp chassis that I never populated, and perhaps now is a time to revisit my amp projects. Why did you pick that integrated one over the other boards like the CxD?
size and efficiency. It definitely hit the rated power numbers. I'd trust his stats for that at least.
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Measuring Amplifiers

Has anyone fan modded the Peavey IPR2 7500 or Crest pro-lite 7.5? Any issues?

Also, does anyone have one of these on a smart strip for auto on/off? Wondering if there is the power on/off thump like the I nuke 6k’s have.


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post #1407 of 1783 Old 02-04-2018, 12:58 PM
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Thanks for the input guys. Unfortunately the peavy needs a $400 part. I can get a new one for $700 or a clone for the same, old clone used or new clone for whatever they go for. I have two 4 ohm subs but could wire them differently

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post #1408 of 1783 Old 02-04-2018, 03:24 PM - Thread Starter
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Originally Posted by bear123 View Post
Has anyone fan modded the Peavey IPR2 7500 or Crest pro-lite 7.5? Any issues?

Also, does anyone have one of these on a smart strip for auto on/off? Wondering if there is the power on/off thump like the I nuke 6k?s have.


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would not recommend fan modding unless you add a temperature based fan speed controller. There's not too much for cooling inside.

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Thanks for the input guys. Unfortunately the peavy needs a $400 part. I can get a new one for $700 or a clone for the same, old clone used or new clone for whatever they go for. I have two 4 ohm subs but could wire them differently
what part out of curiosity?
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I think it was for a couple things. I will have to ask. I know the amp was toast. Power supply, boards or something like that.

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