Measuring Amplifiers - Page 25 - AVS Forum | Home Theater Discussions And Reviews
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post #721 of 1707 Old 06-09-2015, 07:30 AM
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I was going to send him my IPR7500 a while ago but I was gone for work for quite a while and it slipped my mind. I have one that I'm not using now that I could still send him. It wouldn't be an inconvenience for me at all to be without it for a while.

Not let me know if you would be ready for testing this amp and I can get it out this week yet.
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post #722 of 1707 Old 06-09-2015, 07:33 AM
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I was going to send him my IPR7500 a while ago but I was gone for work for quite a while and it slipped my mind. I have one that I'm not using now that I could still send him. It wouldn't be an inconvenience for me at all to be without it for a while.

Not let me know if you would be ready for testing this amp and I can get it out this week yet.
Oooh this would be great. Mine gets used all the time and my theater would not get used at all if I shipped mine out. Thanks for stepping up!

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post #723 of 1707 Old 06-09-2015, 08:56 AM
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I also have an IPR-7500 sitting unused at my dad's since he has stalled on his theater build. I could send that one so no one else is without the use of their amp. The only other amp I have sitting idle is a NU6000, which has already been tested so that about covers my amp availability.

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post #724 of 1707 Old 06-09-2015, 09:01 AM
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I also have an IPR-7500 sitting unused at my dad's since he has stalled on his theater build. I could send that one so no one else is without the use of their amp. The only other amp I have sitting idle is a NU6000, which has already been tested so that about covers my amp availability.
Notynt testing a NU4-6000, which may or may not perform different from a NU6000. So there would still be value testing the NU6000, unless you're saying you have a NU4-6000, not a NU6000.
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post #725 of 1707 Old 06-09-2015, 09:03 AM
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Notynt testing a NU4-6000, which may or may not perform different from a NU6000. So there would still be value testing the NU6000, unless you're saying you have a NU4-6000, not a NU6000.
No. It is an NU6000DSP, not the NU4. So how about I just pack up the bundle, haha.

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post #726 of 1707 Old 06-09-2015, 09:15 AM
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No. It is an NU6000DSP, not the NU4. So how about I just pack up the bundle, haha.
We're going to get you to buy amps you don't own yet to send to notynt for testing at the rate your contributions are climbing.
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post #727 of 1707 Old 06-09-2015, 09:25 AM
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We're going to get you to buy amps you don't own yet to send to notynt for testing at the rate your contributions are climbing.
Good thing we're talking cheap non-SpeakerPower amps. I think I'll balk once we get into the Lab Gruppen range.

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post #728 of 1707 Old 06-09-2015, 09:55 AM
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I also have an IPR-7500 sitting unused at my dad's since he has stalled on his theater build. I could send that one so no one else is without the use of their amp. The only other amp I have sitting idle is a NU6000, which has already been tested so that about covers my amp availability.
That's fine with me if you'd like to send yours in. Do we need to collect some fees for the shipping cost?
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post #729 of 1707 Old 06-09-2015, 10:04 AM
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That's fine with me if you'd like to send yours in. Do we need to collect some fees for the shipping cost?
Since I now have a business, I'll take care of it. But thanks for the offer.
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post #730 of 1707 Old 06-09-2015, 04:12 PM
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Since I now have a business, I'll take care of it. But thanks for the offer.
Thank you muchly, sir!
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post #731 of 1707 Old 06-09-2015, 06:14 PM
 
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Since I now have a business, I'll take care of it. But thanks for the offer.
2 thumbs up for you, that's 4 amps that lots of people will be interested in.
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post #732 of 1707 Old 06-09-2015, 06:18 PM
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Since I now have a business, I'll take care of it. But thanks for the offer.
Thank you for your contribution, that's quite a lineup of amps.

Anthem MRX510, OPPO BDP103, 2x Emotiva XPA-100, Elusive 1099 LCR in progress, LG FP9000 Clone, 2x Dayton Ultimax 15 tuned to 14Hz
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post #733 of 1707 Old 06-09-2015, 07:51 PM
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Thanks dgage.
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post #734 of 1707 Old 06-10-2015, 09:03 AM
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Glad to do it since I have them sitting, might as well do something productive with them.
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post #735 of 1707 Old 06-10-2015, 09:54 AM
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Didn't want to start a thread for this, but since we are all discussing the popular amps here, anyone with first hand experience who would care to comment on how loud the fans are on the Peavey IPR7500dsp? If this unit ends up testing substantially better than the Inuke6000 I imagine it will be a common upgrade path for people who want more output. I tried the fan mod on my Inuke and it went into protect even after some time just sitting idle. I might still try remote location with a 12V trigger wired into the factory power button somehow. Not sure why but I am not a huge fan of the smart power strip option. Anyway, remote location would be a pain to do with the power strip anyhow.
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post #736 of 1707 Old 06-10-2015, 11:30 AM
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I might still try remote location with a 12V trigger wired into the factory power button somehow.
Maybe this?

https://www.adafruit.com/products/268

Not sure if the 15amp limitation is going to be an issue though...
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post #737 of 1707 Old 06-10-2015, 11:50 AM
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Maybe this?

https://www.adafruit.com/products/268

Not sure if the 15amp limitation is going to be an issue though...
Keep in mind an amplifier isn't exactly a resistive load. If you shut it off when idle (not playing anything) it's probably not too inductive, but it certainly isn't a pure resistive load.
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post #738 of 1707 Old 06-10-2015, 11:59 AM
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Keep in mind an amplifier isn't exactly a resistive load. If you shut it off when idle (not playing anything) it's probably not too inductive, but it certainly isn't a pure resistive load.
Sorry, I'm not sure what that means. Are you saying that this little pigtail should be fine to use with an amplifier, or that it shouldn't be used with an amplifier?
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post #739 of 1707 Old 06-10-2015, 12:31 PM
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Sorry, I'm not sure what that means. Are you saying that this little pigtail should be fine to use with an amplifier, or that it shouldn't be used with an amplifier?
They're very careful on the product page to say that's for resistive loads, like heaters. Something like a motor is not a resistive load, but inductive, and has all sorts of other considerations. Meaning you can't use it on a 15A motor. You have to de-rate it to some lower current. Similarly an amplifier has a power supply with caps and isn't a resistive load. I've never been able to find out exactly how inductive an amp is. It probably varies from amp to amp and whether they have PFC or not.

That said, it's probably okay for an amplifier presuming you don't turn it off while running full blast and you're not using a massive several kW amp.
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post #740 of 1707 Old 06-10-2015, 12:34 PM
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That said, it's probably okay for an amplifier presuming you don't turn it off while running full blast and you're not using a massive several kW amp.
Um, iNuke 6k? :-( But I certainly don't plan on turning it off while running full blast.

Anyway, aren't they talking about prolonging the life of the relay, more than anything else?
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post #741 of 1707 Old 06-10-2015, 02:13 PM - Thread Starter
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Didn't want to start a thread for this, but since we are all discussing the popular amps here, anyone with first hand experience who would care to comment on how loud the fans are on the Peavey IPR7500dsp? If this unit ends up testing substantially better than the Inuke6000 I imagine it will be a common upgrade path for people who want more output. I tried the fan mod on my Inuke and it went into protect even after some time just sitting idle. I might still try remote location with a 12V trigger wired into the factory power button somehow. Not sure why but I am not a huge fan of the smart power strip option. Anyway, remote location would be a pain to do with the power strip anyhow.
If your inuke went into protect mode in idle, something is wrong, even with the fan mod. That said, I'm taking spl measurements from the fans in the units when I test the amps.
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post #742 of 1707 Old 06-10-2015, 02:24 PM
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Originally Posted by bear123 View Post
Didn't want to start a thread for this, but since we are all discussing the popular amps here, anyone with first hand experience who would care to comment on how loud the fans are on the Peavey IPR7500dsp? If this unit ends up testing substantially better than the Inuke6000 I imagine it will be a common upgrade path for people who want more output. I tried the fan mod on my Inuke and it went into protect even after some time just sitting idle. I might still try remote location with a 12V trigger wired into the factory power button somehow. Not sure why but I am not a huge fan of the smart power strip option. Anyway, remote location would be a pain to do with the power strip anyhow.
I know this is AVS and I don't have numbers to backup what I'm about to say but Not can soon have said numbers. The IPR-7500 is much more powerful than an iNuke 6000 for powering subs. And a SpeakerPower SP2-8000 is much more powerful than an IPR-7500 for powering subs even though the "published" specs are close.

I haven't heard the IPR-7500 in a while and it is out at my parents house so I can't listen to it but the fans in the iNuke 6000 are definitely loud. Now that I think about it, the IPR-7500s I have came from Coach and I believe he had them modded so they are quieter than standard.

Notnyt, since my IPR-7500s have modded fans, do you want to see if you can get a stock IPR-7500 instead?

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post #743 of 1707 Old 06-10-2015, 02:40 PM - Thread Starter
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I know this is AVS and I don't have numbers to backup what I'm about to say but Not can soon have said numbers. The IPR-7500 is much more powerful than an iNuke 6000 for powering subs. And a SpeakerPower SP2-8000 is much more powerful than an IPR-7500 for powering subs even though the "published" specs are close.

I haven't heard the IPR-7500 in a while and it is out at my parents house so I can't listen to it but the fans in the iNuke 6000 are definitely loud. Now that I think about it, the IPR-7500s I have came from Coach and I believe he had them modded so they are quieter than standard.

Notnyt, since my IPR-7500s have modded fans, do you want to see if you can get a stock IPR-7500 instead?
Do you have the IPR or the IPR2? Anyone can measure fan noise and send me info on that, so I'm not worried about that, however I'd like to measure the IPR2.
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post #744 of 1707 Old 06-10-2015, 02:45 PM
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Originally Posted by bear123 View Post
Didn't want to start a thread for this, but since we are all discussing the popular amps here, anyone with first hand experience who would care to comment on how loud the fans are on the Peavey IPR7500dsp? If this unit ends up testing substantially better than the Inuke6000 I imagine it will be a common upgrade path for people who want more output. I tried the fan mod on my Inuke and it went into protect even after some time just sitting idle. I might still try remote location with a 12V trigger wired into the factory power button somehow. Not sure why but I am not a huge fan of the smart power strip option. Anyway, remote location would be a pain to do with the power strip anyhow.
At idle, I can hear my 7500's fans over both of my nu3000dsp's only because they have a weird sound to them. I always wondered if all 7500's sounded like this or if I was just the unlucky one. Anyways, during heavy bass movie scenes I have never heard my 7500 and can clearly hear my inukes. None of my amps have fan mods because they are in a closet and my 7500 only has one channel being driven right now because I am waiting on my subs to show up and only have some si18's on it. When my new subs arrive, I will be using both channels with a two ohm load on each channel so that my change how loud the fans get. The 7500 doesn't break a sweat the way I am running it right now which is 2400w @4ohms according to the specs published by Peavy.


edit: has anybody noticed that the price of the 7500 went up? I was just looking and they are 999.99 I could have sworn that I got mine for 799.99. Non dsp version.

edit2: I went back and looked up what I paid for mine and it was 799. The freaking jacked up the price 200 dollars!

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post #745 of 1707 Old 06-10-2015, 02:53 PM
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Do you have the IPR or the IPR2? Anyone can measure fan noise and send me info on that, so I'm not worried about that, however I'd like to measure the IPR2.

Yes, I was wondering this too as mine is an IPR2.

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post #746 of 1707 Old 06-10-2015, 02:54 PM
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Do you have the IPR or the IPR2? Anyone can measure fan noise and send me info on that, so I'm not worried about that, however I'd like to measure the IPR2.
I'm almost positive it is the IPR2-7500, don't think I've ever seen an IPR-7500 althrough I've seen people mention the IPR-7500 but they really mean the IPR2-7500. Maybe the 2 means number of channels as opposed to the model. Next time I'm out at my parent's I can verify.

However, I was thinking you might want to get a bone stock IPR2-7500 to test since there isn't a way to know how much a fan mod might affect the results...or you could test both. Nothing like a little extra work.

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post #747 of 1707 Old 06-10-2015, 02:57 PM - Thread Starter
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I'm almost positive it is the IPR2-7500, don't think I've ever seen an IPR-7500 althrough I've seen people mention the IPR-7500 but they really mean the IPR2-7500. Maybe the 2 means number of channels as opposed to the model. Next time I'm out at my parent's I can verify.

However, I was thinking you might want to get a bone stock IPR2-7500 to test since there isn't a way to know how much a fan mod might affect the results...or you could test both. Nothing like a little extra work.
IPR2 is a newer model, I'm not worried about the fan mod as the burst tests are fast and the sustained tests is only for a couple seconds at a time at most, and I have plenty of time to let it cool if it warms up.
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post #748 of 1707 Old 06-10-2015, 03:07 PM
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I got 58db for the Peavy IPR2 7500 fans at idle and 59db for the NU3000dsp fans at idle.

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post #749 of 1707 Old 06-10-2015, 03:08 PM - Thread Starter
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I got 58db for the Peavy IPR2 7500 fans at idle and 59db for the NU3000dsp fans at idle.

Can you measure front and back of both of those for me at 12"? Move the meter around a bit (side to side) and give the highest sustained reading.

My NU3000DSP is modded so that will be useful for me as well, thanks!
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post #750 of 1707 Old 06-10-2015, 03:10 PM
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Can you measure front and back of both of those for me at 12"? Move the meter around a bit (side to side) and give the highest sustained reading.

My NU3000DSP is modded so that will be useful for me as well, thanks!
Yes. I was trying to keep the spl meter away from the air blowing out because that was making the meter read higher. Give me a few minutes..

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