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Hi All, I'm hoping the more trechncally minded of you will be able to help me find a solution to my pre/power issues. I own a pair Of Quad Platinum MonoBlocks and a DEQX Premate +. I am using the Premate Plus as the Preamp and streaming source. I have included links to the manuals below in case they are useful to anyone in helping to solve.... https://www.manualslib.com/manual/1005413/Quad-Platinum-Series.html https://www.manualslib.com/manual/1726275/Deqx-Hdp-4.html#product-PreMATE Problem 1 - I get loud pops from the speakers when changing sources. I have been reliably informed by Alan Langford who designed the DEQX units that this is because of the power supply differences in the design of Deqx Pre and Quad Power amps. The quads are designed to work on two pin IEC cables without grounding where as the DEQX uses 3 pin IEC and is grounded. Hopefully I am explaining this right - the difference in ground volage of the two units creates a ground loop which manifests as a pop when the relays switch in the pre-amp. Alan advised me I could remove the chassis ground on the DEQX; and although not recommended as a safety precaution for the user this should solve the Ground loop problem. Which it has but... Problem 2 The 12v triggers on my Deqx will not trigger turn on the Power amps.... So are these two issues related and is there anything else I can try to solve both of these issues? Potential solutions my inexperienced brain has come up with.... 1. Could I somehow ground the chassis of the Quad Mono's instead of removing the chassis ground of the Deqx? - Would this be detrimental in any way to the sound or safe operation of the Power amps? - Would this still potentially result in the same problem with the 12v triggers as the ground voltage difference would still be the same? 2. Would some form of buffer such as the one linked below between the Pre and Monoblocks solve the pop issue? https://www.musicalfidelity.com/uploads/manuals/English/x10v3_eng.pdf 3. Would balanced XLR IC's rather than RCA IC's help due to cancelling out the feedback from the ground loop? 4. Is there a separate power sensing or IR 12v Trigger I can use to trigger the Monoblocks if none of the above will work? 5. Failing all of the above, I'd prefer to keep the Quad MB's over the Deqx. Are there other Pre-amps I should be looking at that run on a 2 pin (groundless) IEC design? I'm not keen on the Quad DMP as it does not give me the ability to use my own DAC or add a turntable later. I can't find any reviews of the Quad Platinum Pre anywhere, although there is one for sale Germany atm https://www.ebay-kleinanzeigen.de/s-anzeige/vor-verstaerker-quad-platinum-pre-amplifier/1448371173-172-9449 I am using Google translate to usnderstand the ad, but he seems to mention that this amp has a hissing noise. I think he may be talking about a low signal to noise ratio but either way it doesnt exactly fill me with me confidence. Any German speakers are welcome to weigh in on this one! Any other constructive comments or things I may not have thought of are welcome!! Thanks to all who take the time to read and comment. Regards, Brendon.
Further information: Up for sale is my Gieseler M18 PSU Kraftwerk - 5 7 8 9v 1.5A. I bought this new from Clay last year September. This is not a standard version of the Kraftwerk power supply, but has been upgraded with bigger capacitors. From Clay "It has has ended up with 27,000 uf of capacitance which is massive for a small PSU like that". In terms of performance it is in-between the standard version and the Gold Tuned power supplies. Pictures of the PSU and upgraded Caps have been added. The unit was used to power a W4S recovery, also for sale. Condition is excellent, however when preparing for packing, I have noticed there is 1 small hairline crack on the transformer. Postage in Australia included in price. Photos: Advertisements without photos of the actual item will not be approved.
Item: 15V power supply Location: Adelaide Price: $50 Item Condition: Good, some minor scratches on the top.. Reason for selling: I bought 2 then realised it had 2 outputs 🤦♂️ Payment Method: Pickup - Cash, Paypal, Extra Info: I had noise issues with my Pro-ject turntable and tried all sorts of things. Found running 15v from battery worked fine and then a friend suggested these. Worked a treat in cleaning up my hummmmmmmmm. Photos: Advertisements without photos of the actual item will not be approved.
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