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Connecting DSP to Amplifiers & Surge/Power Advice
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SnailSpace View Drop Down
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    Posted: 02 February 2023 at 10:11pm

I’ve bought a Power Distribution Unit which has  3 way power surge protection, it also has an ‘earth ground’ point.

I have my turntable earthed to my Mixer.

I notice that my older QSC 900 USA & dB-Mark DSP have ‘earth ground’ symbol but don’t see anything on QSC GX3 or Crown XLI 3500.

Where should I be grounding the PDU too (If at all?)


Also I’ve read a lot of debate online about what amp fuse (uk) to have in an iec (kettle) lead from amplifiers/gear etc going into a 13amp uk plug? General opinion in UK? Seems to be 10A online?



Edited by SnailSpace - 02 February 2023 at 10:12pm
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Points: 154 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SnailSpace Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2023 at 6:16pm
That’s the phrase I searched initially but they are all M6. After finding a chart M6 are 0.6mm wide mine measure at 0.5mm wide after measuring, so makes mine M5. They also sell them on Thomann and one of the reviews mentions they fit his older Thomann rack which one of mine is! Sorted!

Edited by SnailSpace - 28 January 2023 at 6:32pm
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Points: 2401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2023 at 4:06pm
Search for "rack mount screws" they have a nylon(plastic} washer with them that prevents scratching the equipment.

You should also run a tap through the holes in your rack to measure it's size, this will also clean out any dirt or paint that has accumulated. 
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Points: 154 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SnailSpace Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2023 at 1:01pm
Phew! Great. Yes site shows the cross section which has copper and some silver. It just just be the wholesaler put up the description they get from manufacturers and it differed. 

For anyone in the UK the wholesaler is called KENABLE, they have lots of Audio components that crossover from CCTV. They come up in searches on eBay for audio a lot. I imagine as Audio bits have slowed down in UK I imagine CCTV & IT has filled a bit of a gap. 

Another thing I did buy was a set of Rack Mount Bolts but they are really for the CPU cases the ones that mount into squares and they are M6 bolts. But when I have got them home my bolts are smaller by 2mm, as I have circular hole format on my racks, searched around and only ones listed as Audio are M6. I think I must need M5, seems to be plenty on eBay. Again it’s all the little things that slow progressLOL




Edited by SnailSpace - 28 January 2023 at 2:02pm
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Points: 2401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2023 at 2:16am
Yes any XLR cable you buy should be balanced which means it had wires connected to all 3 pins, these will typically have fairly small gauge wires inside(22-24ga) with a braided mesh shield. If the cable has heavy gauge wire and/or has only 2 conductors and no shield it is not suitable as an equipment interconnect.
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Points: 154 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SnailSpace Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2023 at 12:59am
Bought some XLR’s from a place online, but local for collection purposes, specialise in CCTV stuff but also has alot of Audio. But because they have sick a selection of XLRs I’ve read the description and it’s said ‘great for live and studio for when gear is close together’ exactly what I need? So I’ve got them, need to change as I’ve miscalculated lengths of a few short ones. So ive got to look and I’ve saw another section of Balanced XLRs? Do I need balanced?
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Points: 154 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SnailSpace Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2023 at 8:39pm
Thanks Conanski! Next step learning to use the DSP LOL
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Originally posted by SnailSpace SnailSpace wrote:

My poor Pre Amp ha! Nobody seems to like it on here ;) I see what you’re saying though the mixer has dedicated balanced XLR outs.

I understand what people are saying about the Pre Amp as it is just extra Bass Mid Treble & Volume into the equation.
Yes.. the mixer has all the same features and the preamp has nothing but unbalanced RCA I/O so it's not a great fit. 

Originally posted by SnailSpace SnailSpace wrote:

So what about Power - is a bog standard 19 power distribution bar enough for what I have or with turntable, mixer, dsp & x3 amps do I need some extra kit?
Put the amplifier rack on it's own dedicated circuit plugged directly in, and use a power bar for the rest of the equipment at home or a small UPS if playing out.

Edited by Conanski - 27 January 2023 at 2:43pm
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It’s not a ‘proper’ reggae/dub pre it’s a Gemini PA-700 so it’s basically a line of Bass/Mid/Treble and volume so I can see why people are saying it over complicates things as it probably adds extra variables that may mess with DSP sound settings.
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Points: 55 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JamesH Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2023 at 8:12am
I love a good pre
Who built it?

Oh, and, it's YOUR sound, so keep the pre in the rack
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Points: 154 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SnailSpace Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2023 at 7:56am
My poor Pre Amp ha! Nobody seems to like it on here ;) I see what you’re saying though the mixer has dedicated balanced XLR outs.

I understand what people are saying about the Pre Amp as it is just extra Bass Mid Treble & Volume into the equation.

So what about Power - is a bog standard 19 power distribution bar enough for what I have or with turntable, mixer, dsp & x3 amps do I need some extra kit?
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Points: 2401 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2023 at 12:34am
Why don't you leave the preamp out for the time being, then connect the mixer XLR outs to the DSP inputs and you have a complete signal chain. Once you have all the DSP processing setup you won't need much EQ... and what is available on the mixer should be sufficient. 
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