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post #1321 of 1783 Old 03-21-2017, 01:04 PM - Thread Starter
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I'm working to clear a little project off my work bench this week so I can finish the full IPR2 tests, then I can put the enhanced FP14000 on the bench and do a full test on that.
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post #1322 of 1783 Old 03-21-2017, 01:08 PM
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Funny, I asked you back then what the 2 channel performance was. I believe you tested it in bridged mode.

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post #1323 of 1783 Old 03-21-2017, 01:10 PM
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How dare you do something else!

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post #1324 of 1783 Old 03-21-2017, 03:35 PM - Thread Starter
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Originally Posted by MKtheater View Post
How dare you do something else!
From what I remember with a single channel, they'll burst without issue as advertised and sustain the output I listed, even out one channel. They're beasts.
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post #1325 of 1783 Old 03-22-2017, 06:12 AM
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post #1326 of 1783 Old 03-22-2017, 08:34 AM
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From what I remember with a single channel, they'll burst without issue as advertised and sustain the output I listed, even out one channel. They're beasts.

Damn, if those numbers are times 2 then they are beasts! My woofers can take 2000 watts and I will port them at 10hz. I may sell my Peavy and pick up the BHT but the Peavy probably can drive my woofs easily. I will wire them in 4 ohms(D2) XXX 18s. The enclosure is massive as well which they require.

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post #1327 of 1783 Old 03-22-2017, 08:36 AM - Thread Starter
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Damn, if those numbers are times 2 then they are beasts! My woofers can take 2000 watts and I will port them at 10hz. I may sell my Peavy and pick up the BHT but the Peavy probably can drive my woofs easily. I will wire them in 4 ohms(D2) XXX 18s. The enclosure is massive as well which they require.
At 4 ohms, they'll burst about 4kw per chan, and sustain about 4800w combined for a second, then 3800w or so for a while longer.
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post #1328 of 1783 Old 03-22-2017, 08:41 AM
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That would seems like it will be fine, though that BHT is tempting, did you sell yours yet?

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post #1329 of 1783 Old 03-22-2017, 10:23 AM - Thread Starter
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That would seems like it will be fine, though that BHT is tempting, did you sell yours yet?
not yet, still sitting on my floor waiting for me to test it fully. so many projects. I assume you mean the botai enhanced clone
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post #1330 of 1783 Old 03-22-2017, 12:44 PM
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Yes, that one.

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post #1331 of 1783 Old 04-23-2017, 01:28 PM
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Originally Posted by notnyt View Post
I'm working to clear a little project off my work bench this week so I can finish the full IPR2 tests, then I can put the enhanced FP14000 on the bench and do a full test on that.
Very interested in noise floor results for IPR2 7500, channel A compared to channel B.
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post #1332 of 1783 Old 04-24-2017, 07:08 AM
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Originally Posted by john lutz View Post
Very interested in noise floor results for IPR2 7500, channel A compared to channel B.
Funny...I was wondering if I was just hearing things when I thought the noise floor on channel A was higher than B.
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post #1333 of 1783 Old 08-20-2017, 12:27 AM - Thread Starter
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Originally Posted by john lutz View Post
Very interested in noise floor results for IPR2 7500, channel A compared to channel B.
Both channels have a lot of hf switching noise. I don't see much difference between them. I'll get it hooked up to an RTA to see if there's a difference there, though.
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post #1334 of 1783 Old 08-20-2017, 12:29 AM - Thread Starter
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Since calculating power based on the peak to peak voltage on the center of the cea-2010 burst was being called into accuracy, I took the time to see just how far inaccurate it is.

Vpp = 57.6, Vrms = 20.3

You're welcome to do the math and see how far off that is

Also, this signal is not distorted in any way. During testing, I push the amp very slightly into clipping to produce ~1% THD so the top peak more closely matches the bottom anyway. This ensures the amp is at it's limits.



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post #1335 of 1783 Old 08-24-2017, 09:20 PM - Thread Starter
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Originally Posted by lukeamdman View Post
Funny...I was wondering if I was just hearing things when I thought the noise floor on channel A was higher than B.
If you were, it probably wasn't from the amp.
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post #1336 of 1783 Old 08-25-2017, 10:35 AM
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It would be interesting to see how various amps handle 1/4power followed by a full power burst. Rather than just cea and pure sinewaves.

Wouldn't that more accurately determine an amps true reserve power at handling content more likely found in a basshead movie or song?
Or at least give another meteric to oogle over.

Perhaps a max-sustained pinknoise test as well...

As nobody listens to sinewaves or bursts ( although some of you are crazy enough... )
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post #1337 of 1783 Old 08-25-2017, 11:20 AM - Thread Starter
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Originally Posted by BassThatHz View Post
It would be interesting to see how various amps handle 1/4power followed by a full power burst. Rather than just cea and pure sinewaves.

Wouldn't that more accurately determine an amps true reserve power at handling content more likely found in a basshead movie or song?
Or at least give another meteric to oogle over.

Perhaps a max-sustained pinknoise test as well...

As nobody listens to sinewaves or bursts ( although some of you are crazy enough... )
These tests are fairly good at showing what an amp can burst for various durations and what they can sustain. The interval burst test is good, but these tests are easy to generate and measure.
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post #1338 of 1783 Old 08-25-2017, 08:21 PM - Thread Starter
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IPR2-7500 2 ohm numbers. These are pretty impressive, though I would like to see more burst in the LF range. Excellent efficiency numbers and great sustained power. That said, the fans are noisy and the price is a little high for what you get.

I'd go with the Prolite 7.5 over this as it's basically the same amp with larger capacitors (7200uF) and is $50 cheaper at B&H.

summary:

2.2 ohms - 4kw single channel, 5kw two channels into
4.5 ohms - 2.5kw single channel, 3.7kw two channel into

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 all the way when its under heavy 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.

3v of switching noise at 349khz










1ch driven into 2.2r


2ch driven into 2.2r


1ch into 4.5r


2ch into 4.5r


1ch into 9r


2ch into 9r



This is a 100hz signal, you can see how little burst it has. I should have zoomed in on this more to make it easier to see, sorry.

OUTPUT
pink: output signal

INPUT
cyan: signal
purple - power
blue - current
yellow - voltage





Noise









Frequency Response



Distortion numbers 6db below clipping into 2 ohms
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post #1339 of 1783 Old 08-25-2017, 09:19 PM
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You say the price is high for what you get but it is my go to "budget" recommendation for DIY subwoofers if the person isn't willing to step up (double) to the SpeakerPower amps, which in my opinion are the best subwoofer specific amps on the market. Do you have an amp you recommend more for subwoofer duty? I know I'm being specific here but subwoofers normally tax an amp more than other loads. Also, I'm sometimes asked to make recommendations for DIY subwoofer builds so I'd like to know what options are out there. Thanks.
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post #1340 of 1783 Old 08-25-2017, 09:33 PM - Thread Starter
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You say the price is high for what you get but it is my go to "budget" recommendation for DIY subwoofers if the person isn't willing to step up (double) to the SpeakerPower amps, which in my opinion are the best subwoofer specific amps on the market. Do you have an amp you recommend more for subwoofer duty? I know I'm being specific here but subwoofers normally tax an amp more than other loads. Also, I'm sometimes asked to make recommendations for DIY subwoofer builds so I'd like to know what options are out there. Thanks.
Depends how many subs are in use I guess. You can get about 4 nu6k's for the same price. The FP clones are also cheaper and have triple the output power in burst, but a little less sustained. SP would obv be my choice as well, though cost is higher.

The efficiency on these is nice. They have a nice breaker on the back as well. No fuses to worry about. I'd pick an FP first but this would be my next choice.

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post #1341 of 1783 Old 08-25-2017, 09:45 PM
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Thanks. Clones are dead to me though as I can't/won't recommend something without a UL listing.

Regarding the Behringers, they aren't quite as powerful down low so with a large sealed system, I'm not sure they're the best choice. It would be a great budget amp for a ported system though. That's at least my real world impression after having played with one. Is that accurate?
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post #1342 of 1783 Old 08-25-2017, 09:53 PM - Thread Starter
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Thanks. Clones are dead to me though as I can't/won't recommend something without a UL listing.

Regarding the Behringers, they aren't quite as powerful down low so with a large sealed system, I'm not sure they're the best choice. It would be a great budget amp for a ported system though. That's at least my real world impression after having played with one. Is that accurate?
The nu6k's will get you 1600w into 4 ohms, or 2400w total with 2 channels driven. so yeah, not the most potent, but if you have a load of subs, they're pretty cheap to spread around. It takes about 2 of the nu6ks to match the IPR2, but you can get 4 for the same price if budget is limited.

I hear you on the clones, they have their downfalls, and as a vendor you can't recommend them. These are prob the best option next to the speakerpower amps, then. The sp1-6000 is about the same price and is a better amp, though.
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post #1343 of 1783 Old 08-25-2017, 11:06 PM
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Good info and thanks for the summary. Last question. I'm not searching through 1300+ posts to find where you tested the Behringers but as I said, it seemed like the Berrys run out of low end grunt under 15Hz. Is that true or did your testing show them to put out power down low? Now that I think about it, I remember swapping a friend's Behringers NU6K for a SP2-8000, which as we agree isn't fair at all. So maybe my memory is flawed and the amps are fine down low but need to be doubled up as you suggest. Thanks again. Appreciate your efforts in testing and sharing the info.

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post #1344 of 1783 Old 08-26-2017, 12:18 AM - Thread Starter
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Originally Posted by dgage View Post
Good info and thanks for the summary. Last question. I'm not searching through 1300+ posts to find where you tested the Behringers but as I said, it seemed like the Berrys run out of low end grunt under 15Hz. Is that true or did your testing show them to put out power down low? Now that I think about it, I remember swapping a friend's Behringers NU6K for a SP2-8000, which as we agree isn't fair at all. So maybe my memory is flawed and the amps are fine down low but need to be doubled up as you suggest. Thanks again. Appreciate your efforts in testing and sharing the info.
I tested an NU4-6000, they didn't have much dropoff down low at all, just not much power output.

This is in bridged config

1ch into 4r


2ch into 4r
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post #1345 of 1783 Old 08-26-2017, 06:54 AM
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Great info. Thank you!

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post #1346 of 1783 Old 08-26-2017, 07:45 AM
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Let me make sure I am reading this right. If you use the Inuke6K as a two channel amp it provides around 1200 watts per channel into 4 ohms, assuming both channel driven and the IPR2 provides 2400-2500 watts per channel into 2 ohms? If this is true than the Inuke would be the same at 4 ohms and the Peavy is a 2 ohm stable version? So in order to get the benefit of the 3 dB of the IPR2 one would have to wire for 2 ohms?

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post #1347 of 1783 Old 08-26-2017, 09:14 AM
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Good info and thanks for the summary. Last question. I'm not searching through 1300+ posts to find where you tested the Behringers but as I said, it seemed like the Berrys run out of low end grunt under 15Hz. Is that true or did your testing show them to put out power down low? Now that I think about it, I remember swapping a friend's Behringers NU6K for a SP2-8000, which as we agree isn't fair at all. So maybe my memory is flawed and the amps are fine down low but need to be doubled up as you suggest. Thanks again. Appreciate your efforts in testing and sharing the info.

MadHek tested the input signal circuit and found the roll off was introduced due to the size of several capacitors. His tests showed flat frequency response down to ~5Hz replacing 2 caps and 2-3Hz with 6 caps replaced. I did the mods on my 6000, and it is not too difficult and cost about $12 using Nichicon audio caps. I don't really run the amp full tilt though and can't comment on the high power behavior.
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post #1348 of 1783 Old 08-26-2017, 10:09 AM
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Originally Posted by FriscoDTM View Post
MadHek tested the input signal circuit and found the roll off was introduced due to the size of several capacitors. His tests showed flat frequency response down to ~5Hz replacing 2 caps and 2-3Hz with 6 caps replaced. I did the mods on my 6000, and it is not too difficult and cost about $12 using Nichicon audio caps. I don't really run the amp full tilt though and can't comment on the high power behavior.
Good info too. You mention ~5 Hz with 2 caps replaced and 2-3 Hz with 6 caps replaced. What did it show before the modifications? Thanks.

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post #1349 of 1783 Old 08-26-2017, 10:50 AM - Thread Starter
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Originally Posted by MKtheater View Post
Let me make sure I am reading this right. If you use the Inuke6K as a two channel amp it provides around 1200 watts per channel into 4 ohms, assuming both channel driven and the IPR2 provides 2400-2500 watts per channel into 2 ohms? If this is true than the Inuke would be the same at 4 ohms and the Peavy is a 2 ohm stable version? So in order to get the benefit of the 3 dB of the IPR2 one would have to wire for 2 ohms?
I'll be testing the ipr2 at 4 ohms later today so we'll be able to compare
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post #1350 of 1783 Old 08-26-2017, 10:56 AM - Thread Starter
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Good info too. You mention ~5 Hz with 2 caps replaced and 2-3 Hz with 6 caps replaced. What did it show before the modifications? Thanks.
I linked the graph in the other inuke thread that's running, but here it is again. This is Madhek's measurement.




I think the nu4-6000 I tested was pretty much flat to 10hz and -5db at 2hz.

There's a strange non linearity at 100hz, I don't know what the deal with that is, but it's in all my measurements of this amp and I haven't seen it in any of my others.

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