Yamaha CP2000 rails, Holy cow!

danielm · 17th January 2007, 12:43 AM

I measure +,- 119V! Its one of many that have died on us. Used to have a rack full. Loaded with QSC now.

Outputs are 4x 2sc3856, 4x 2sa1942.

Nice layout is all I can say for this POS.

Can these devices survive at this potential?

lumanauw · 17th January 2007, 01:10 AM

This CP2000 uses what is called EEEngine. The actual C-E voltage of the output device is only about 10V all the time. The rest 109V is managed by classD voltage down-regulator.

How is the sound of this amp? Is QSC sounds better?

danielm · 17th January 2007, 03:21 AM

Quote:

Originally posted by lumanauw
This CP2000 uses what is called EEEngine. The actual C-E voltage of the output device is only about 10V all the time. The rest 109V is managed by classD voltage down-regulator.

How is the sound of this amp? Is QSC sounds better?

In my opinion the CP2000 is not an amp I would ever want to own again. It has a real difficult time with anything other than a perfectly resistive load. It cannot drive a Lab sub with out doing strange things.

As far as cheap pro sound power amps go, the EP2500 will eat the CP2000 for lunch. I had a chance to put an EP2500 on the bench and try to break it. It meets its advertised specs and then some. Tough loads are no problem. Is it a QSC 2450? No, but its a very close clone.
The Yamaha CP2000 meet a budget we had a few yrs back for a system. It was alway connected to a comfortable load that dipped to around 6 ohms. Failed one day while powering it up. It was maybe one yr old. A QSC 2450 pulled from another rack kept the show going.
The system is a small three meter line array using 16 tens, BC750 hf drivers and four 27 hertz folded horn Lab subs. Xover points are 90 and 1.2Khz.
I had used the CP2000s at one time to drive some of the mid boxes. Now its all QSC.

The system will easily do 100dba at 150+ feet FOH and sounds as clean and acurate as my old Acoustats at home.

There may be a pic or two here:

www.beanstock.org

Anyone interested in a "one legged" CP2000? Cheap.

lumanauw · 17th January 2007, 03:44 AM

Quote:

In my opinion the CP2000 is not an amp I would ever want to own again. It has a real difficult time with anything other than a perfectly resistive load. It cannot drive a Lab sub with out doing strange things.

Thanks for the info. You mentioned "strange things". What is it?

I'm about to make an experiment with EEEngine system. But if from your info this EEEngine only makes "strange things", I will cancel this experiment.

danielm · 17th January 2007, 04:02 AM

The CP2000 has three LEDs. Green , yellow and Red. The green indicates signal, yellow is some relative level and red indicates clipping of the output waveform. If I recall the clip (red LED) came on before the yellow as the level was brought up.
I noticed this when driving the Lab sub which dips to just under four ohms at one point in the passband.

imix500 · 17th January 2007, 04:25 AM

How similar is this amp to the H series? Yamaha speaks of sharing protection circuitry but I wonder if it has any other similarities?

lumanauw · 17th January 2007, 04:30 AM

Hi, Danielm,

Besides the led indicator, is there anything strange about the sound?

danielm · 17th January 2007, 01:32 PM

Quote:

Originally posted by lumanauw
Hi, Danielm,

Besides the led indicator, is there anything strange about the sound?

I would not drive the load. We noted very little power out at the point the "clip" LED was flickering. My first thought was one of the two drivers in the sub was shorted. Apparently, the amp was in some protect mode.

Lightly loaded, the CP2000 sounds fine. Although, I never put one on the bench and checked, I always got the impression it was a "lightweight" when it comes to power output. An old Peavey CS-800 has more... 'balls'.

The amp board has an odd layout in the output section. Anyone have a schematic? I might as well repair it.

brewgrey · 6th January 2008, 09:19 PM

I have the schematic. Can e-mail it.

super mario · 24th January 2008, 08:55 PM

Hi,

I have CP2000 waiting repair for over a year, because I can't find
schematic. I received this amp without any transistor on board, so I have no idea how to start repair.
Please sir can you send me schematic and help me so much after long, long search...?
Sorry if something is not correct with my English writing

Thanx a lot.

Best regards

17th January 2007, 12:43 AM	#1
danielm diyAudio Member Join Date: Dec 2006	Yamaha CP2000 rails, Holy cow! I measure +,- 119V! Its one of many that have died on us. Used to have a rack full. Loaded with QSC now. Outputs are 4x 2sc3856, 4x 2sa1942. Nice layout is all I can say for this POS. Can these devices survive at this potential?

6th January 2008, 09:19 PM	#9
brewgrey diyAudio Member Join Date: May 2003 Location: Indiana	2000 Schematic I have the schematic. Can e-mail it.

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17th January 2007, 01:10 AM	#2
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	This CP2000 uses what is called EEEngine. The actual C-E voltage of the output device is only about 10V all the time. The rest 109V is managed by classD voltage down-regulator. How is the sound of this amp? Is QSC sounds better?

17th January 2007, 04:02 AM	#5
danielm diyAudio Member Join Date: Dec 2006	The CP2000 has three LEDs. Green , yellow and Red. The green indicates signal, yellow is some relative level and red indicates clipping of the output waveform. If I recall the clip (red LED) came on before the yellow as the level was brought up. I noticed this when driving the Lab sub which dips to just under four ohms at one point in the passband.

17th January 2007, 04:25 AM	#6
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Nashville, TN	How similar is this amp to the H series? Yamaha speaks of sharing protection circuitry but I wonder if it has any other similarities?

17th January 2007, 04:30 AM	#7
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Hi, Danielm, Besides the led indicator, is there anything strange about the sound?

24th January 2008, 08:55 PM	#10
super mario diyAudio Member Join Date: Jan 2008	Hi, I have CP2000 waiting repair for over a year, because I can't find schematic. I received this amp without any transistor on board, so I have no idea how to start repair. Please sir can you send me schematic and help me so much after long, long search...? Sorry if something is not correct with my English writing Thanx a lot. Best regards

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