Crest Pro Lite 7.5

W

Weogo Reed

Freshman
Jan 4, 2012
99
2
8
Western North Carolina
Hi Y'all,

A while back I ordered a Crest Pro Lite 7.5 amp and it arrived today.

Hooked up signal, power and speakers and listened to it.
It sounds fine, hope to put it to more of a test in a few days.

Thanks and good health, Weogo
 
Re: Crest Pro Lite 7.5

Hello, can you share how it sounds compared to other amplifiers on the same speakers, if that's what you did? Driving subs? Fan noise? I am looking at this amp as well, any hands on observation would be greatly appreciated!
 
Re: Crest Pro Lite 7.5

They have low fan noise, exiting out of the front. They sound amazing, dual differential design, fully balanced from input to output. Lots of power, using 4 Pro Lite 7.5s (IPR 2 7500 with beefed up power supply) to power 4x Peavey VR 218s. I used to use a Crown Itech and am VERY pleased with the IPR/Pro lite for sub duty. Ive also used Macro Techs and assorted Crest and Peavey amps and these cannot be beat for head room. Due to the great power supply they really excel at low frequency power, (<50 hz) This creates the feeling that you are actually gettng deeper response out of your subs, and in fact this is true. Other amps tend to have rail sag at low frequencies if they cannot recharge the supply caps fast enough. This also is why some amps dont weigh as much as older amps. The switching power supply is actually much better than toroids since it can charge the caps at a higher freq. A quick and dirty example of this is why a amp designed for 60 hz operation performs poorly at 50hz line conditions. Msg me if you need any more info.
 
Re: Crest Pro Lite 7.5

Marjan Milosevic said:
Are those global psu or there are two versions of them?
Click to expand...

There are two versions: 120V and 240V
The power supply is optimized to operate at either 50Hz or 60Hz.

If you have a unit that is set up for one mode of operation, it can be converted to the other mode of operation fairly simply. The biggest issue is getting the appropriately sized circuit breaker installed.
 
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Re: Crest Pro Lite 7.5

You beat me to it. Although it's not "global" by means of auto detecting mains voltage it's nice that full power is available in 50hz countries. For the street price of a grand for a crest pro lite 7.5 and 750 for the ipr 7500 you really can't find a comparable amplifier.
 
Re: Crest Pro Lite 7.5

A few Crests from the past had a voltage select jumper in the primary PSU. Converting them from 120 to 230V was a matter of resetting that jumper in the correct position and replacing the mains connector.
I don't know if this is possible with these amps :)
 
Re: Crest Pro Lite 7.5

Helge Dr. Bentsen said:
A few Crests from the past had a voltage select jumper in the primary PSU. Converting them from 120 to 230V was a matter of resetting that jumper in the correct position and replacing the mains connector.
I don't know if this is possible with these amps :)
Click to expand...
It is basically that easy-except as said earlier the breaker (on off switch) should change value to half or double the current rating to be "right".
 
Re: Crest Pro Lite 7.5

Helge Dr. Bentsen said:
A few Crests from the past had a voltage select jumper in the primary PSU. Converting them from 120 to 230V was a matter of resetting that jumper in the correct position and replacing the mains connector.
I don't know if this is possible with these amps :)
Click to expand...

Does anyone know for sure if this is the case for the Prolite range? They are available on E-bay USA for less than half the European price!
 
Re: Crest Pro Lite 7.5

Jim Rowe said:
Does anyone know for sure if this is the case for the Prolite range? They are available on E-bay USA for less than half the European price!
Click to expand...

As me and Josh stated earlier, that is exactly the case.

But the current rating on the switch (Which is the breaker) will no longer be correct.

If you buy the 120V version-and switch it to 240V, the breaker will be twice the size it should be. The only real danger is that if there is an internal problem-additional damage could occur to the amp-causing additional expense in the repair.

If you buy the 240V version and switch it to 120V, then the breaker could trip before it is supposed to (because it is half the value it is supposed to be).

Here is a funny "fact". Did you know UL does NOT require a circuit breaker or fuse to be in something that is plugged into an AC service?
 
Re: Crest Pro Lite 7.5

If you are coming to InfoComm14, be sure to stop by the Peavey Commercial Audio booth to see the Pro-LITE 7.5 doing some rather uncommon work.

You can even make yourself a key-chain to take home, depending on if you can sing the tune.
 
Re: Crest Pro Lite 7.5

You guys had a cool booth this year. I can't wait for the eMotion/Crest hardware to hit. It looks like I will keep pestering Joel on a quarterly basis for etas.
 
Re: Crest Pro Lite 7.5

Ivan Beaver said:
As me and Josh stated earlier, that is exactly the case.

But the current rating on the switch (Which is the breaker) will no longer be correct.

If you buy the 120V version-and switch it to 240V, the breaker will be twice the size it should be. The only real danger is that if there is an internal problem-additional damage could occur to the amp-causing additional expense in the repair.
Click to expand...
Or burning down your house.
If you buy the 240V version and switch it to 120V, then the breaker could trip before it is supposed to (because it is half the value it is supposed to be).

Here is a funny "fact". Did you know UL does NOT require a circuit breaker or fuse to be in something that is plugged into an AC service?
Click to expand...

That is funny (ha ha)... In my experience UL often made us instal fuses even inside products (not user serviceable) to prevent fires should say a diode short out or other common component failure that caused high temperature rise near flammable media.

They apparently do not require a fuse/breaker in an extension cord.

JR
 
Re: Crest Pro Lite 7.5

John Roberts said:
Or burning down your house.


That is funny (ha ha)... In my experience UL often made us instal fuses even inside products (not user serviceable) to prevent fires should say a diode short out or other common component failure that caused high temperature rise near flammable media.

They apparently do not require a fuse/breaker in an extension cord.

JR
Click to expand...
Or light fixtures and other products.

It is "assumed" that the circuit breaker in the panel will blow before the wire melts.

One of our OEM amp manufacturers found this out when researching the requirements for one of the high power amps.

Of course it may be what particular part of the code one is looking at or who they are talking to.
 
Re: Crest Pro Lite 7.5

Ivan Beaver said:
Or light fixtures and other products.

It is "assumed" that the circuit breaker in the panel will blow before the wire melts.
Click to expand...
In my experience UL does not ASSume, they certify designs as safe, so the light fixtures are well tested. Even things like the line cords used are specified and certified.
One of our OEM amp manufacturers found this out when researching the requirements for one of the high power amps.

Of course it may be what particular part of the code one is looking at or who they are talking to.
Click to expand...

That has not been my experience. Hopefully you have the UL file number for that OEM amp module, where UL tested and certified it as safe without a fuse/breaker. There are different ways to skin any cat, so if the amp can safely operate w/o a line cord fuse/breaker it's all good.

FWIW with modern amps the resettable mains breaker is more a short term power limiting device than used for human safety. The transformer will probably have an internal thermal fuse for when the breaker fails hard on (they can do that).

I have had my share of knock down drag out battles with UL over things as simple as what line cord I use on a 3kW amp, which is modest power by modern standards.

JR
 
Re: Crest Pro Lite 7.5

Has anyone used the DSP version yet? I'm curious if the limiters are actually usable or if they're similar to DRPA's "limiters".
 
Re: Crest Pro Lite 7.5

Gary Weller said:
Has anyone used the DSP version yet? I'm curious if the limiters are actually usable or if they're similar to DRPA's "limiters".
Click to expand...
What do you mean by "usable"?

The only adjustment is 1dB steps-down from max output. So they basically act as a maximum output voltage limiter.

The amp also has the DDT circuit-which keeps it from clipping. As far as I know the DDT is not defeatable
 
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