Arrangement of components on rack


Now and again -- though not often enough, probably -- I spend some time unhooking and unplugging everything in my system, dusting the works, and then setting it all back up again. Makes me feel better, and it seems that the simple act of unplugging and then reattaching cables and power cords etc. improves the sound, too -- if only in my mind.

As I'm getting ready to do that now, I just had a thought: Is there a generally accepted arrangement for components sharing a rack? What I mean is: Are there components that ought be placed close together and those that should be better spaced out? My power amp sits between my speakers, with the rest of the gear over on the side wall.

I've got a turntable, so that takes care of what goes on the top shelf. The other components: A preamp, a separate phono preamp, a CD transport and DAC in one box, a Bluesound Node streamer.

With all else equal, should, say, the phono preamp and the preamp be near each other? Far apart? does it not matter? I've generally just kind of plunked things down and gone from there -- and haven't experienced too much trouble -- though some years back when I had the preamp (the main one, not the phono pre) up close to the turntable I had a bit of hum, so put the preamp on the bottom shelf and have continued to do so.

Still, as I got to wondering and am set to get to work on this soonish, I thought I'd ask if there's a generally accepted way of arranging things.

Thanks very much.

-- Howard

hodu

Showing 1 response by bdp24

The arrangement of my components is the consequence of my thinking in terms of the signal path and it’s inter-connect terminations.

I’m a firm believer in the notion of tonearms being wired in the single-shot fashion: single uninterrupted runs of wire from the cartridge clips to the RCA jacks that plug into the RIAA phono stage. The phono cartridge/pick-up (the British term for cartridges) output is of the lowest level in the entire hi-fi chain, low output cartridges producing only 0.2mV or less!. The last place you want avoidable breaks in the signal path is in that of a cartridge on it’s way to being amplified by the phono amp.

The most common way tonearms are designed and built is with their internal wires terminated on RCA jacks (NOT plugs), with a required interconnect plugged into those jacks, the other end into the phono amp. That’s great in terms of ergonomics, but less than optimal in terms of signal degradation.

However, not terminating the arm’s internal wiring into RCA jacks requires the arm’s external wires be long enough to reach the phono amp, yet also as short as possible. Designers who make their arms with single-shot wiring like to keep the external wiring to no longer than 1/2 meter, 1 meter tops. They often then add shielding to the wire, which is a whole ’nother discussion!

With an arm having a very short length of external wire, the phono amp must then be placed very close to the turntable. I actually place my phono amp directly behind my table, with that amp’s rear side facing the back side of the table (and therefore the listener). Not pretty, but which do you prioritize: Looks, or sound quality?

The output of the phono stage is much more robust, fully the equal of most other sources. How long can be the inter-connect between line stage and power amp(s) is a function of: 1- the output impedance of the line stage; 2- the input impedance of the power amp; 3-the electrical characteristics of the inter-connects; and 4- how much you want to spend. ;-)