Crest 4000 amplifier info needed

starkiller · 6th August 2010, 11:41 PM

Hi

Have a Crest 4000 amp, not the CC one, just the plain 'ol 4000. Been trying to find specs for it without luck. Even the folks at Crest say they don't have a thing, ZIp-zilch-nada. So, posting here in case by luck someone has the same amp or knows the specs or has a service or owners manual for one.

Thanks!

djk · 7th August 2010, 08:05 AM

If I remember correctly, the Crest 4000 is 700W/2R per channel.

Here is the schematic:

http://www.crestaudio.com/media/sche...hematicSet.pdf

I've used the On Semiconductor outputs and drivers to repair these, they work fine.

starkiller · 9th August 2010, 09:09 PM

Do you think there would be any problem in using two pairs of speakers in parallel?

Enzo · 10th August 2010, 12:51 AM

The amplifier doesn't know or care how MANY speakers you connect to it. All the amp ses is the total impedance of what you connect. In other words one 4 ohm speaker will be a greater burden on an amp channel than two 16 ohm speakers. And an 8 ohm cabinet can have one speaker or eight speakers in it, but the amp only sees the 8 ohms.

ANy amp has ratings, often printed on the rear panel. The amp will be rated down to some impedance - 4 ohms for example. A solid state amp like that will be happy with any load impedance down to that rated impedance. If it is rated for 4 ohms, don't offer it 2 ohms. Higher impedances are fine. An amp rated down to 4 ohms will be happy as a clam all day pushing 8 ohm speakers.

SO you have to look at the speakers you intend to use for their impedances. If they are 8 ohm speakers, then two of them makes 4 ohms. If they are 16 ohm speakers, then two of them makes 8 ohms. And if they are 4 ohm speakers, then a pair of them makes 2 ohms. Look at what speakers you have, determine what two of them would make and compare that to the amp rating.

starkiller · 10th August 2010, 01:32 AM

Thnaks for the info. Yeah, i know about the impedence and stuff, just have never run two sets of speakers in parallel before and want to make sure. One set is 8 ohm and one set is 6ohm so i am guessing the total load should be fine.

6th August 2010, 11:41 PM	#1
starkiller diyAudio Member Join Date: Aug 2010	Crest 4000 amplifier info needed Hi Have a Crest 4000 amp, not the CC one, just the plain 'ol 4000. Been trying to find specs for it without luck. Even the folks at Crest say they don't have a thing, ZIp-zilch-nada. So, posting here in case by luck someone has the same amp or knows the specs or has a service or owners manual for one. Thanks!

7th August 2010, 08:05 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	If I remember correctly, the Crest 4000 is 700W/2R per channel. Here is the schematic: http://www.crestaudio.com/media/sche...hematicSet.pdf I've used the On Semiconductor outputs and drivers to repair these, they work fine. __________________ Candidates for the Darwin Award should not read this author.

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9th August 2010, 09:09 PM	#3
starkiller diyAudio Member Join Date: Aug 2010	Do you think there would be any problem in using two pairs of speakers in parallel?

10th August 2010, 12:51 AM	#4
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	The amplifier doesn't know or care how MANY speakers you connect to it. All the amp ses is the total impedance of what you connect. In other words one 4 ohm speaker will be a greater burden on an amp channel than two 16 ohm speakers. And an 8 ohm cabinet can have one speaker or eight speakers in it, but the amp only sees the 8 ohms. ANy amp has ratings, often printed on the rear panel. The amp will be rated down to some impedance - 4 ohms for example. A solid state amp like that will be happy with any load impedance down to that rated impedance. If it is rated for 4 ohms, don't offer it 2 ohms. Higher impedances are fine. An amp rated down to 4 ohms will be happy as a clam all day pushing 8 ohm speakers. SO you have to look at the speakers you intend to use for their impedances. If they are 8 ohm speakers, then two of them makes 4 ohms. If they are 16 ohm speakers, then two of them makes 8 ohms. And if they are 4 ohm speakers, then a pair of them makes 2 ohms. Look at what speakers you have, determine what two of them would make and compare that to the amp rating.

10th August 2010, 01:32 AM	#5
starkiller diyAudio Member Join Date: Aug 2010	Thnaks for the info. Yeah, i know about the impedence and stuff, just have never run two sets of speakers in parallel before and want to make sure. One set is 8 ohm and one set is 6ohm so i am guessing the total load should be fine.

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