IPR7500 vs Crown XLS1500 - Graphed - AVS Forum
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post #1 of 10 Old 10-17-2013, 07:59 AM - Thread Starter
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Here's a comparison between these two amps running on my two sealed url-18's. The red curve is when I had an xls1500 bridged on each url with huge amounts of boost down low. Using my miniDSP I had a heavy low shelf with about 8db boost plus a big peak at about 15hz with 8db boost on each sub just to get things flat to 20. I also tried running a second shelf but it didn't gain much more. I then swapped out the amps for an IPR7500 with one sub on each channel and no changes to the dsp which resulted in the orange curve. I was then able to remove all boost and get pretty much the exact same curve I had before with boost. Pretty clearly shows the rolloff on the xls series amps. I still run 5 of them on all my speakers as they are great amps for full range or upper bass but not deep bass. Just for clarity these sealed subs only cover from 25Hz down while I have a JTR Orbit Shifter covering 25-90 Hz.

The IPR is a beast. I'm not going past one light and I get the feeling I could destroy the uxl's without any trouble. The fan is louder and the lights are annoying as hell but it works.


(3) JTR Noesis 212HT (LCR)
(2) JTR Single 8 (wides)
(2) JTR Slanted 8 (sides)
(2) DIY Eminence 10" coax (rear Surrounds)
(2) JTR Orbit Shifters
(2) Mach5 UXL-18's sealed
(2) Soundsplinter 15's sealed
Speakers powered by 6 crown xls 1500's
UXL's powered by Peavey IPR-7500

My theater:
http://www.avs...
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post #2 of 10 Old 10-17-2013, 11:21 AM
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10 dB increase from 8-10 Hz! How much do you actually realize that increase? I see that you removed the 8 dB boost later to achieve the same curve as before with the XLS so what was the point? I appreciate the measurement though. I may want to swap amps in my IB system sometime...

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post #3 of 10 Old 10-17-2013, 11:34 AM - Thread Starter
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I removed all the boosts and got the same curve then added a bit back in to get a smoother curve that extends deeper. I am now able to increase the level of the subs to get more of a house curve without running into power limits. Before with over 20db of boost things weren't happy when run hot. Now I can go until I'm in pain or I mealy the voicecoils without the amp complaining.

(3) JTR Noesis 212HT (LCR)
(2) JTR Single 8 (wides)
(2) JTR Slanted 8 (sides)
(2) DIY Eminence 10" coax (rear Surrounds)
(2) JTR Orbit Shifters
(2) Mach5 UXL-18's sealed
(2) Soundsplinter 15's sealed
Speakers powered by 6 crown xls 1500's
UXL's powered by Peavey IPR-7500

My theater:
http://www.avs...
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post #4 of 10 Old 10-17-2013, 11:58 AM
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Nice! biggrin.gif

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post #5 of 10 Old 10-17-2013, 01:07 PM
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Quote:
Originally Posted by subyguy View Post

Here's a comparison between these two amps running on my two sealed url-18's. The red curve is when I had an xls1500 bridged on each url with huge amounts of boost down low. Using my miniDSP I had a heavy low shelf with about 8db boost plus a big peak at about 15hz with 8db boost on each sub just to get things flat to 20. I also tried running a second shelf but it didn't gain much more. I then swapped out the amps for an IPR7500 with one sub on each channel and no changes to the dsp which resulted in the orange curve. I was then able to remove all boost and get pretty much the exact same curve I had before with boost. Pretty clearly shows the rolloff on the xls series amps. I still run 5 of them on all my speakers as they are great amps for full range or upper bass but not deep bass. Just for clarity these sealed subs only cover from 25Hz down while I have a JTR Orbit Shifter covering 25-90 Hz.

The IPR is a beast. I'm not going past one light and I get the feeling I could destroy the uxl's without any trouble. The fan is louder and the lights are annoying as hell but it works.


What I did for the lights was tape a little bit of left-over black velvet from my old DIY screen to the top of the 7500. I just let it drape over the front of the amp so when the fans are running it blows up a shade, but not enough to see any of the lights. ventilation is still good enough that I have yet to see it get hot at all. I want to start working on a fan mod but I have no idea what type of replacement fans could/would work with it. If I knew I would get started yesterday.

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post #6 of 10 Old 10-17-2013, 01:24 PM - Thread Starter
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Good idea on the fabric. I have plenty if black velvet left from bat caving the room. As for fans there are 3 in the ipr. I had it opened up to wire in a relay to trigger. I should have written down the specs but didn't and now it's mounted in my rack. I have a glass door on my rack and with it closed the fan noise is acceptable and only noticeable when nothing is playing. Unfortunately it is the only piece of year that's at all audible.

(3) JTR Noesis 212HT (LCR)
(2) JTR Single 8 (wides)
(2) JTR Slanted 8 (sides)
(2) DIY Eminence 10" coax (rear Surrounds)
(2) JTR Orbit Shifters
(2) Mach5 UXL-18's sealed
(2) Soundsplinter 15's sealed
Speakers powered by 6 crown xls 1500's
UXL's powered by Peavey IPR-7500

My theater:
http://www.avs...
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post #7 of 10 Old 10-18-2013, 04:47 AM
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Thank you so much for the info. I've never liked bridging low wattage amps. Always gotten much better performance using higher watt amps in stereo mode.
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post #8 of 10 Old 10-18-2013, 07:22 AM - Thread Starter
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The XLS isn't really a low wattage amp (at 1500w bridged same as ep4000) but it's more the built-in 20Hz filter that is the issue. I never truely believed there was one in it until now lol.

(3) JTR Noesis 212HT (LCR)
(2) JTR Single 8 (wides)
(2) JTR Slanted 8 (sides)
(2) DIY Eminence 10" coax (rear Surrounds)
(2) JTR Orbit Shifters
(2) Mach5 UXL-18's sealed
(2) Soundsplinter 15's sealed
Speakers powered by 6 crown xls 1500's
UXL's powered by Peavey IPR-7500

My theater:
http://www.avs...
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post #9 of 10 Old 10-18-2013, 11:11 PM
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If you EQ differently, overlaying the curves is kind of worthless. How about graphs without any EQ? Or at least use the same EQ.
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post #10 of 10 Old 10-19-2013, 07:21 AM - Thread Starter
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Quote:
Originally Posted by notnyt View Post

If you EQ differently, overlaying the curves is kind of worthless. How about graphs without any EQ? Or at least use the same EQ.

Reading comprehension LOL...

"I then swapped out the amps for an IPR7500 with one sub on each channel and no changes to the dsp which resulted in the orange curve."

(3) JTR Noesis 212HT (LCR)
(2) JTR Single 8 (wides)
(2) JTR Slanted 8 (sides)
(2) DIY Eminence 10" coax (rear Surrounds)
(2) JTR Orbit Shifters
(2) Mach5 UXL-18's sealed
(2) Soundsplinter 15's sealed
Speakers powered by 6 crown xls 1500's
UXL's powered by Peavey IPR-7500

My theater:
http://www.avs...
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