rook question class D

mechaboy1 · 15th December 2006, 01:35 AM

Hi guys,
I tried searching the forums but could not find this answerI have a basic question to ask you. I just purchased a Crest 7001 amplifier. I learned it is a class D amp. I heard that class AB amps are more better for highs and mids than a class D amp. I will be running 2 full range speakers JBLMp215's with 250 RMS 8 olms on the Crest 7001 which is 550 watts per channel at 8 olms. I heard you always double the RMS so my amp should be around 500 watts per channel. Will this amp have to much bass and less clarity for my speakers? Is there only a little difference? I have a 4801 and I like the sound it is thick. Should I have went with the crest CA 6 or 9 ab amps?

BWRX · 15th December 2006, 11:23 AM

Quote:

Originally posted by mechaboy1
I heard that class AB amps are more better for highs and mids than a class D amp.

This is just not true for most of the class d amps out there today. Back when they were used mainly in car audio applications they got the bum rap of only being subwoofer amps.

Since you already bought it, why don't you just listen to it and find out for yourself?

fredos · 15th December 2006, 11:35 AM

Sorry but your Crest 7001 is a analogue amplifier with a switching power supply...

Fredos

mechaboy1 · 15th December 2006, 05:52 PM

Thanks for the clarrification BWRX. I will try out the amp, so they aren't just subwoofer amps. I searched several internet sites and most of them did say class D amps were used for subswoofers because of there power and efficiency. I also read some people say class D amps were D for Digital. In reading a reliable source I found out they are not digital at all. That is a commonly used myth. Not every amp manufacturer can build class D amps because they must be built well. What does Fredos mean by a it having a switching power supply?
The 4801 was also a class D amp, but with less wattage, after trying that amp and listening to the sound I feel I will never go back to any other type of amp, but the next 2 models up. I just wanted to make sure it wasn't gong to have to much low end for my speakers, since it has more wattage than my 4801. Also will these run ok on 15 amp circuit breakers. I read one person say they won't, the guy at Crest said 20 or 21 amps are recomended. Thanks for the replys guys.

mechaboy1 · 15th December 2006, 09:43 PM

I looked at your site Fredos, I can't believe that amp is 10 pounds, uses 1U rack space, and it is true digital, that is amazing. The wattage numbers are out of this world. Can these amps take a beating?

Nixie · 16th December 2006, 02:37 AM

What is this thread, some kind of D-amp advertisement?

What's next, peranders will post here selling an improved version?

mechaboy1 · 16th December 2006, 02:55 AM

I am in no way affiliated with Fredos. I just came on here to learn some basic knowledge of D amps from the pros.

Workhorse · 16th December 2006, 04:49 AM

Quote:

Originally posted by mechaboy1
I am in no way affiliated with Fredos. I just came on here to learn some basic knowledge of D amps from the pros.

Hi Mechaboy1,

The amplifiers you are mentioning were Class-H from Crest not Class-D, correct your mistake, Crest CA Series, PRO Series all are Class-H amps,
Only Crest CD 1000, CD2000, CD3000 are Class-D amps.....

Fredos make Class-D amps there arenot digital but Analogue Switching Amplifiers, They are lightweight because they donot feature the Heavy Toroidal Transformer and massive Heatsinks in Class-AB type amps...
These use Switching Supply and Switching Amplifier and thus weight less .....

Update yourself!

regards,
K a n w a r

DcibeL · 16th December 2006, 05:51 AM

Quote:

Originally posted by Nixie
What is this thread, some kind of D-amp advertisement?

Well that was about the rudest thing you could have said. Where's the advert? I'd love to see it.

Nixie · 16th December 2006, 05:56 AM

Quote:

Originally posted by DcibeL
Where's the advert? I'd love to see it.

Quote:

Originally posted by mechaboy1
I can't believe that amp is 10 pounds, uses 1U rack space, and it is true digital, that is amazing. The wattage numbers are out of this world.

Wasn't even my idea initially; someone pointed it out to me in the IRC channel, and I couldn't agree more.

15th December 2006, 01:35 AM	#1
mechaboy1 diyAudio Member Join Date: Sep 2006	rook question class D Hi guys, I tried searching the forums but could not find this answerI have a basic question to ask you. I just purchased a Crest 7001 amplifier. I learned it is a class D amp. I heard that class AB amps are more better for highs and mids than a class D amp. I will be running 2 full range speakers JBLMp215's with 250 RMS 8 olms on the Crest 7001 which is 550 watts per channel at 8 olms. I heard you always double the RMS so my amp should be around 500 watts per channel. Will this amp have to much bass and less clarity for my speakers? Is there only a little difference? I have a 4801 and I like the sound it is thick. Should I have went with the crest CA 6 or 9 ab amps?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Little Class D question	The Dragon	Class D	4	16th May 2007 09:01 PM
Another question about class A.	boxedin	Solid State	72	10th January 2006 11:58 PM
Question on PS for class AB vs class A	Duck-Twacy	Solid State	7	10th June 2004 10:44 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

15th December 2006, 11:35 AM	#3
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	Sorry but your Crest 7001 is a analogue amplifier with a switching power supply... Fredos

15th December 2006, 05:52 PM	#4
mechaboy1 diyAudio Member Join Date: Sep 2006	Thanks for the clarrification BWRX. I will try out the amp, so they aren't just subwoofer amps. I searched several internet sites and most of them did say class D amps were used for subswoofers because of there power and efficiency. I also read some people say class D amps were D for Digital. In reading a reliable source I found out they are not digital at all. That is a commonly used myth. Not every amp manufacturer can build class D amps because they must be built well. What does Fredos mean by a it having a switching power supply? The 4801 was also a class D amp, but with less wattage, after trying that amp and listening to the sound I feel I will never go back to any other type of amp, but the next 2 models up. I just wanted to make sure it wasn't gong to have to much low end for my speakers, since it has more wattage than my 4801. Also will these run ok on 15 amp circuit breakers. I read one person say they won't, the guy at Crest said 20 or 21 amps are recomended. Thanks for the replys guys.

15th December 2006, 09:43 PM	#5
mechaboy1 diyAudio Member Join Date: Sep 2006	I looked at your site Fredos, I can't believe that amp is 10 pounds, uses 1U rack space, and it is true digital, that is amazing. The wattage numbers are out of this world. Can these amps take a beating?

16th December 2006, 02:37 AM	#6
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	What is this thread, some kind of D-amp advertisement? What's next, peranders will post here selling an improved version?

16th December 2006, 02:55 AM	#7
mechaboy1 diyAudio Member Join Date: Sep 2006	I am in no way affiliated with Fredos. I just came on here to learn some basic knowledge of D amps from the pros.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)