Long cable run from my phono preamp to linestage.

yep, sorry "MHz" speed always gets the better of me

Cheers George

10-27-14: Paraneer
I currently run 5 meters from a phono pre-amp to my integrated on a second table that I recently acquired. No worries!
Paraneer (System | Threads | Answers | This Thread)

10-27-14: Mcgal
I am running a 3m cable from my phono pre-amp to my pre-amp. I am using an upgraded cable for the 3m distance. Sounds great to me.
Mcgal (Threads | Answers | This Thread)

Paraneer/Mcgal/Dkarmeli, I have no doubt that you guys are getting a nice sound.

But without doing the calculations in my last post, what I'm saying you may not know if your getting the very best out of it.
And to do that I need the output impedance of Audiobrian's phono stage, then I can tell him what (pf) interconnect to use with that long run so he get's 100% quality transfer to his preamp.

Cheers George

No problems Audiobrian, your 4mt long interconnects are so low in capacitance you could even use a 10kohm passive preamp with them no problems, this would be around -3db at 300khz still.

Cheers George

Hi Audiobrian,

I looked up the capacitance of your Cabledyne Silver Reference. The 4 mts of it will yield 160pf for each channel. This combined with the 300ohms output impedance of your phono pre will give you a -3db at 3.3ghz!! Which is no trouble at all, bats wouldn't even hear this hf roll off.

If you use the same interconnect between your VAC pre (which is half that of the of the phono pre at 143ohms) and your poweramp it is even better at -3db at 6.8ghz!!!

So the end result is you can use it either way, go with what sounds best and convenient to you, as either way you are not causing any roll off into the audio bands high frequency.

Cheers George

Sorry Bifwynne, although I know Kim and Al from Deqx, I don't use their product, as I'm what you call a minimalist.

That is, all components in my quite large system are modded and impedance matched in such a way for me to get the signal to the speakers in the best possible way with the least amount of electronics in the signal path.

EG: if I could, the source with digital domain volume and very strong output stage a few watts, would drive a pair of 120db speakers direct in my fantasy world.

Cheers George

Kim and Al are very good mates of mine and operate just around the corner, putting Deqx premate in between anything will never cause damaging trouble even if there is a impedance mismatch.

Your Ref 5 has a 300 ohms SE ouput impedance, they (AR) recommend a minimum of 20k load, and I see no impedance mismatch with the Deqx 50kohm input impedance, and the output of the Deqx being SS should be fine looking at the 300kohm input impedance of the Ref 150.

Deqx don't give an output impedance on their website propaganda sheet, I must let them know to include it, I assume it to be around 50-100ohms.

Cheers George

PS: They (Deqx) just rang me and said the output impedance of the Premate is 600ohm XLR and 74ohm SE.

Cheers George

Bifwynne.
Your output impedance of your AR P8 being 200ohm is fine to use 20ft of interconnect with, as even if the interconnect was 100pf per foot (=2000pf for 20ft) that equates to a -3db of 400khz which is bat hearing teritory.

Paraneer.
For me to calculate yours with your 5mt of interconnect, I need to know the output impedance of the Pro-ject Phono Box S pre-amp, not the load impedance you've posted. Saying that, I've done a google on this Pro-ject and being solid state, I would guess it similar to Bifwynne above.

Tube output phono stages or preamps and passives would have the big ? on them, with these long interconnect runs.

Audiobrian the OP, needs to post what his phono stage output impedance is to see if he will get 100% sound quality transfer. But it looks like he's missing in action, even though he's the one who started this thread.

Cheers George

Almarg is right Audiobrian, to get the best out of it we need to know the output impedance of your phono stage first.

Then I will calculate for you the maximum capacitance of 4mt interconect you should use, as it will roll off the highs a bit if not right, which Dkarmeli may be doing without even knowing it.

Cheers George