Did u hear about Crescendo amps... ive heard that from Hunter Audio India...

diysmartdeep21 · 12th February 2005, 06:21 AM

what is the cresendo amps well wat ive heard that these are the only amps which drives the tripple 270mm or quad 270mm magnet based woofers.... and he said that the magnet size is overdamped...so we have to use something really powerful amp...
but what cresendo means???

why cant chip amps drive such huge drivers....?

If so velodyne uses the class D chip amps to drive their monsters...

what can class D chip amps drive the Huge magnet structed Woofers?

hunter audio · 9th July 2005, 06:49 PM

hi

most probably people in chip amps will not be able to help , post this in solid state (where all the solid guys are actually ) and ull get all your repies

suranjan

Bgt · 10th July 2005, 08:26 PM

Crescendo was the Power Mosfet Amp from Elektor in 1982

slackman · 11th July 2005, 08:19 AM

Yes,
and later on the 'Millennium Crescendo' ...

Very cool design but belongs to the solid state fraction.

mik

Bgt · 11th July 2005, 03:43 PM

Quote:

Very cool design

Jep, I made dozens of them. Never a problem. Lots of mods. and rock stable. The best amp. Elektor ever made. Made all the amps. from Elektor but this 1 stayed. Still use 4 of them.

jean-paul · 11th July 2005, 07:36 PM

Wasn't it the original Crescendo that oscillated quite frequently ( or was that the other, later one ? ).

Bensen · 11th July 2005, 09:09 PM

yes, jean-paul. It was the first Crescendo amp (1982) that oscillated pretty havely when used wired wound resistors. Mine amp runs perfectly since 1998.

With the Crescendo ME, I had first also a few problems wih oscillation, but these were solved by making better PCBs.

But I wouldn't know why many other amps couldn't drive these woofers, there are much better diy amps than the crescendo's.

amplifierguru · 12th July 2005, 02:11 AM

Hi all.

I have had zero to do with on chip power amps but here's a possible theory (we physicists are good at theories) - Chip amps are marketed on power output and so this is the primary goal, reactive load driving ability which would cause considerably higher package and output stage dissipation, is not! So the output stages probably have some restrictive SOA protection included which is why they don't drive reactive loads so well.

Just a theory.

Greg

Eva · 12th July 2005, 06:25 AM

This smells of dirty marketing.

edl · 12th July 2005, 08:42 AM

the original crescendo schema:
http://www.audiofanatic.it/Schemi/Ti...K135_2SJ50.jpg

12th February 2005, 06:21 AM	#1
diysmartdeep21 Banned Join Date: Jan 2004 Location: ANDHRA PRADESH	Did u hear about Crescendo amps... ive heard that from Hunter Audio India... what is the cresendo amps well wat ive heard that these are the only amps which drives the tripple 270mm or quad 270mm magnet based woofers.... and he said that the magnet size is overdamped...so we have to use something really powerful amp... but what cresendo means??? why cant chip amps drive such huge drivers....? If so velodyne uses the class D chip amps to drive their monsters... what can class D chip amps drive the Huge magnet structed Woofers?

11th July 2005, 07:36 PM	#6
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Wasn't it the original Crescendo that oscillated quite frequently ( or was that the other, later one ? ). __________________ It's only audio

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9th July 2005, 06:49 PM	#2
hunter audio diyAudio Member Join Date: Dec 2003 Location: calcutta	hi most probably people in chip amps will not be able to help , post this in solid state (where all the solid guys are actually ) and ull get all your repies suranjan

10th July 2005, 08:26 PM	#3
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	Crescendo was the Power Mosfet Amp from Elektor in 1982

11th July 2005, 08:19 AM	#4
slackman diyAudio Member Join Date: Mar 2005 Location: Germany, lower saxonny (Bremervörde)	Yes, and later on the 'Millennium Crescendo' ... Very cool design but belongs to the solid state fraction. mik

12th July 2005, 02:11 AM	#8
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Hi all. I have had zero to do with on chip power amps but here's a possible theory (we physicists are good at theories) - Chip amps are marketed on power output and so this is the primary goal, reactive load driving ability which would cause considerably higher package and output stage dissipation, is not! So the output stages probably have some restrictive SOA protection included which is why they don't drive reactive loads so well. Just a theory. Greg

12th July 2005, 06:25 AM	#9
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	This smells of dirty marketing.

12th July 2005, 08:42 AM	#10
edl diyAudio Member Join Date: Oct 2004	the original crescendo schema: http://www.audiofanatic.it/Schemi/Ti...K135_2SJ50.jpg

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