Peavey IPR 1600 DSP

[Michael Murphy]

Ran up the new IPR today, 50hz sine wave 53v with out DDT lighting up @ vol -3, 0 being the loudest. @ 0 58v DDT comming on a bit. OEM manual states maximum voltage swing is 55v. Snoop Lion, here comes the king 54v DDT on 50V DDT off.

How did it run up my 2 ea T39's vs the QSC 1400. HELLO the bass lines were more authoritative, more punch, more depth and clarity between sudden low freq changes. Had snoop lions song that was givin me hell to clean up the bass line clean as a whistle.

Did not use any of the DSP features, cause Ive got the PA+ up top, but played with them before adding it to the system, intuitive and easy to use if it was to be used as a stand alone amp and dsp.

The 2 OT12's before would over run the T39's, now not so much, to the point I had to check if 2 were playing.

At 20 ft away measured 94db and the bass has my clothes shimmering, up close pounding on you. (Still have a leak to fix on 1 cab as air is coming out the rear hand holds)

Ran for a couple of hours, all styles of music, ddt full on, off some times, very little audible change when turning up until DDT kicks in.

The 2 T39's v plated now sound like I had anticipated it would have with 4.

Tooks some pics and videos. Will add link later. Even got the stabilizer cable between the upper and lower v plate to start to want to make a sine wave!

Temperature with my 3ohm load, could not even feel some warmth on the case, fan a full speed sounds like F16 in the distance, my PC fan makes more noise.

So overall impression very very very happy

[netwerks]

Also looking good though listing for $100 more - IPR2 2000DSP. It appears to have a limiter built into the DSP however it is limited by dB not by volts.

http://www.peavey.com/products/index.cf ... nbsp%3BDSP

[Michael Murphy]

I think the 2 are the same, will chek furher. Oh and the voltages were mesured with DVM.

[Ryan A]

I love my IPR 1600 dsp as well. How do you turn off the DDT I didn't kno that was possible. Not that I'd want to, it's a very graceful but protective limiter.

[Tom Smit]

I believe pumpfast did it by increasing and decreasing the volume on the desk while measuring the voltage.

[88h88]

Y'know I've never actually used my 1600 to run a pair of subs... I've got next week off work so weather allowing I'll get on that and see what happens.

[Michael Murphy]

Yeah Ryan as Tom said I was using the main mixer to increase the signal to engage and disengage the DDT, no turning it off or bypassing it. This amp so goes against traditional terminology. The gain knobs are referred to as volume knobs, even on the display it indicates volume.

As for the IPR2 2000, I remember going over the specs vs the IPR 1600 DSP and the only difference I could find was the 2000 states 900w@ 2ohms, 530w @ 4ohms, while the 1600 states 900w@ 2ohms, 515w @ 4ohms. I think its just a lil rebranding.

using http://www.net-comber.com/decibel.html the 54v vs 34v nets a 4db increase hence the audible change in sound. Those T39's wernt getting enough power. I have an eq on the mixer and before I had the 40-80hz up by 6db and at lwer volumes could switch the eq on and off and hear the gain difference, could not do it at max volume because the amp would clip. Tried it again with the new amp at war volume no change, so the QSC 1400 was definitely under power.
Heres a couple pics and vids. Watch the cable in the last one.
https://www.dropbox.com/s/ik0mdsaprxb9g ... .49.16.jpg https://www.dropbox.com/s/6wv7mnf5hix8l ... .49.54.jpg https://www.dropbox.com/s/gcpjs3i9lpscv ... .28.00.mp4 https://www.dropbox.com/s/nxhbvpm21rvlu ... .43.32.mp4

[Charles Jenkinson]

It's going through my mind, so I gotta ask: Isn't this amp only just big enough for running a pair of T39's flat out, one on each channel?

[Michael Murphy]

Id say yes. However I ran the 2 T39s in parallel of 1 channel, so I can also power the OT12s on the other side. IMO perfect match for lab 12's

[Ryan A]

Yeah Ryan as Tom said I was using the main mixer to increase the signal to engage and disengage the DDT, no turning it off or bypassing it.

Ah, I read the post wrong, my bad.

I'm running my T39's as a 4 ohm load (2 ohm speaker [4 + 4 ohm coil wired parallel] + horn impedance) to each channel of the IPR 1600 DSP, and its taken the load with no problem and sounds great, never sounds like it's struggling to push the subs.

[Charles Jenkinson]

...IMO perfect match for lab 12's

One on each channel....?

Isn't it the case that the assessments you're making about running up to the DDT limiter, the maximum voltage it will do, and then saying it's fine for a pair of T39's (LAB12's) all rather marginal? 300W at 8 ohms is bang on 49V. Furthermore, from the spec's, the power is not there at 4 ohms to run to the max.

All I'm thinking is that a little conservatism is needed, after a few of us went through the process of defining the bleeding edge of amp performance in the 2 ohm thread.

I could be missing something - let me know.

[Michael Murphy]

To clear things up, I have the infinitys in the cabs, almost identical specs to the labs, which I also have but have not put them in cause I want to measure the cabs properly using the SA 3055 which will be arriving shortly, then the labs will go in. The infinitys are 4ohms, so add 2 for the cab, 6 and parallel wired to one channel nets 3ohm load. The 6ohm labs will end up 4ohms parallel wired. I agree with you the published specs dont add up to the measured values, they are lower, which were taken with out the drivers attached. Ill take some with the drivers attached and see if it makes a difference.

I actually have 2 T39 plans the first has the Lab 12 limited at 50v the second at 55v. The DVM shows 53v with a 50hz test tone. Head room has been unofficially declared not relevant with having to limit and all so what im saying is this lil 7lb sucker has the umph to handle the labs.

[netwerks]

Yeah Ryan as Tom said I was using the main mixer to increase the signal to engage and disengage the DDT, no turning it off or bypassing it. This amp so goes against traditional terminology. The gain knobs are referred to as volume knobs, even on the display it indicates volume.

As for the IPR2 2000, I remember going over the specs vs the IPR 1600 DSP and the only difference I could find was the 2000 states 900w@ 2ohms, 530w @ 4ohms, while the 1600 states 900w@ 2ohms, 515w @ 4ohms. I think its just a lil rebranding.

using http://www.net-comber.com/decibel.html the 54v vs 34v nets a 4db increase hence the audible change in sound. Those T39's wernt getting enough power. I have an eq on the mixer and before I had the 40-80hz up by 6db and at lwer volumes could switch the eq on and off and hear the gain difference, could not do it at max volume because the amp would clip. Tried it again with the new amp at war volume no change, so the QSC 1400 was definitely under power.
Heres a couple pics and vids. Watch the cable in the last one.
https://www.dropbox.com/s/ik0mdsaprxb9g ... .49.16.jpg https://www.dropbox.com/s/6wv7mnf5hix8l ... .49.54.jpg https://www.dropbox.com/s/gcpjs3i9lpscv ... .28.00.mp4 https://www.dropbox.com/s/nxhbvpm21rvlu ... .43.32.mp4

I believe the new IPR2 series has an actual limiter section in the dsp which can be adjusted in dB increments.

[Ryan A]

...IMO perfect match for lab 12's

One on each channel....?

Isn't it the case that the assessments you're making about running up to the DDT limiter, the maximum voltage it will do, and then saying it's fine for a pair of T39's (LAB12's) all rather marginal? 300W at 8 ohms is bang on 49V. Furthermore, from the spec's, the power is not there at 4 ohms to run to the max.

All I'm thinking is that a little conservatism is needed, after a few of us went through the process of defining the bleeding edge of amp performance in the 2 ohm thread.

I could be missing something - let me know.

You are. Running max voltage on an amplifier is no different that running max voltage on a speaker. It shouldn't be done very often. If you find yourself in that situation you should be adding more cabs/amplifiers. This amp is a perfect match for a pair of titans voltage/power wise (50v limit for each).

As far as the "bleeding edge" so to speak, you only reach that when trying to run the cabs @ 2 ohms per channel with this amplifier. 4-8 ohms is absolutely no sweat, even into the limiter. Take it from somebody who has the amp.

[Michael Murphy]

Networks Ill look into that, have not found a IPR2 owner manual as yet.

You know this whole thing on the amps capability has me wondering why the questions.

We know a lab 12 is recommended by bill to be limited at 50v

Any one setting up there berry or PA+ limiter has been told to do the same thing, push everything up, limit until the signal wont pass 50v, with driver disconnected. Set it and forget it, but check it once an a while.

All Ive put forth was exactly stated in the first post. To summaries

With out DDT engaging 50V

Right now its seeing a 3ohm load and is happy, it will be even more when it get up to 4ohm

AND If the limit reccomendation is 50v for the driver and the IPR can put out 50V I dont see any harm in running them at those values, but I do agree that if you want more a second pair of Titans is the way to go for some measure of conservatism. But if the driver and amp can both take/ do 50v well im gonna push it.

As a foot note this system is going to be rented out so Im pushing it hard to see what it can take, cause when im not around and the DJ see's them girls dancing he's going to try and sqeeze the limits too. I think the DDT feature will take care of this. Oh and I found a post on the IPR forum that said it may not catch a transient if not in DDT mode but will when its on, so I ran it on almost all day yesterday and if it can survive my hard hitting rap, dub, dubstep, reggae and dance it can survive a local dj.

Thats it!

Is it only me but seeing a 1/4 cable pulled tight wanting to make like the tacoma bridge is amazing.