QSC EX4000? |
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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I did all repairs for the BeNeLux importer for like 15 years, that's how I know these things first hand and have service manuals, factory internal info, part number lists and stuff like that.
Yes they do have dual transformers and true seperate PSUs. There's only one NTC ( soft start ) and one powerswitch, but apart from that, each channel works independant from the other. Seperate transformers, fuses and rectifiers. The electrolytic caps for each channel are on the main amp boards. The only true independant amps QSC ever had, seperate power cords, switches and all, were the 3800's.
The difference is marginal in terms of being measurable, let alone you could hear it in terms of dB's produced with speakers on it. I have all types in use on a variety of speaker systems ranging from 16 ohm to 2 Ohm and the only thing I can notice different, is that the RMX series tends to keep things a bit cooler, not by much though.
I don't have them, but can make some pictures the first time I have one for repair again. The last time I had one, was a few months ago, so don't expect a picture right away Edited by Peter Jan - 21 January 2009 at 3:55pm |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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Bare in mind that the EX 4000 is 22 year-old design. The MX 3000a offers the same power as the EX 4000. That was my choice (EX 4000) for low-mids many years ago before upgrading to the PL 6.0 The EX 4000 also weighs around 34.09 kgs and, has a very strong turn on surge. Here is a photo I took close to 10 years ago. "> I would say the RMX 4050 would be similiar to the EX 4000/MX 3000a in terms of performance. Best Regards, |
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Elliot Thompson
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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Well, here you see one channel, the other is upside down under it. You can turn both amp sections mounted on the heatsink, upside down. That mirror mounting thing is very convenient for repairs as almost everything can be measured like it is in the picture. |
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ychole audio
Young Croc Joined: 18 January 2007 Location: United States Status: Offline Points: 625 |
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Can anyone provide the internal pics of the mx3000a so we can lay it side-by-side with the ex4000?Are the same on the layout on the inside?
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I am ZERIEL'S dad!!!
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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I said it before a few times : "the amps themselves are really entirely identical. There's not one single component different between them. All differences are situated in the add-ons. XLR connections or TRS jacks, rotary pots with steps or stepless, Speacon or binding post only, a few more indicator LED's on the front and an extra piece of metal in the front making the "pro" models a tiny bit stronger for heavy duty road use, but that's about it. I have service manuals of all QSC's and have layed the schematics side by side, I have repaired hundreds of QSC amps and JBL amps and have seen with my own eyes they are a true match. The only difference over the years is that the first EX-4000 circuit boards had the step-up stages and temperature management build out of discrete components and they started using small smd boards to replace those sections after a few years." Edited by Peter Jan - 26 February 2009 at 4:56pm |
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la malta
New Member Joined: 08 February 2009 Status: Offline Points: 4 |
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I have a question for you guys.
The specs for the 4050hd say it's damping factor is >250 at 8 ohms impedance. Does anyone know what its damping factor is at 4 and 2 ohm loads per channel? |
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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>125 @ 4 Ohm and half of that @ 2 Ohm |
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Bob Lee (QSC)
Registered User Joined: 10 April 2009 Location: Costa Mesa, Cal Status: Offline Points: 59 |
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The MX3000a and later version of the EX4000 are the same except for the display and input modules.
The EX4000 got an upgrade (slight boost in power rating, deleted HF/high-power limiting) when the MX3000a was developed.
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Bob Lee
Apps Engnr, QSC Audio Secretary, Audio Engineering Soc. |
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ryanbairan
Registered User Joined: 29 September 2008 Location: asia Status: Offline Points: 68 |
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EX4000 was one of the best amplifier in soubd industry
but try to check the capacitor some times it blows or embows,
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Sabbelbacke
Registered User Joined: 02 February 2010 Location: Germany Status: Offline Points: 48 |
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Hi there,
searching the web brought me here .. I have a QSC EX4000 here with a blown transformer (and maybe other parts are fried as well). Does anyone happen to have a spare transformer or a partly broken amp to use as a replacement? I tried QSC Germany, but they are out of transformers and the shops I know who are able to build new ones don´t have the suitable core for this kind of transformer shape. Thank you for any assistance. |
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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Try QSC Belgium ( AED BVBA ). Last time I checked, they had them in stock.
Part n° is XF-000003-00 or XF-004000-00 and specify it's for either MX-3000a, EX-4000 or JBL MPX1200 or MPA1100. They are all identical. |
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Sabbelbacke
Registered User Joined: 02 February 2010 Location: Germany Status: Offline Points: 48 |
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Hello Peter,
thank you for this, I will contact them :) Hope they still have some and shipping isn´t too much to Germany. |
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