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#343747 - 03/31/11 05:25 PM Re: Subwoofer cable vs stereo RCA interconnect? [Re: CatBrat]
nickbuol Offline
axiomite

Registered: 09/16/04
Posts: 5357
Loc: Marion, IA
I've ordered cables/wires from Blue Jeans and Monoprice. Been very happy with products received from both companies. Monoprice is definitely cheaper than Blue Jeans, but Blue Jeans isn't bad compared to others out there either.
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#343752 - 03/31/11 06:37 PM Re: Subwoofer cable vs stereo RCA interconnect? [Re: nickbuol]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1291
Loc: Quebec, Canada
a couple of years ago i got satellite tv in the house.
they use very good RG6 so when the tech had finished making the installation, i asked him if he would be willing to make up six 15ft. cables terminated with rf plugs, with rf to gold phono adapters at each end.

for me, it was a good thing to do, price/quality wise.
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#343836 - 04/01/11 11:45 AM Re: Subwoofer cable vs stereo RCA interconnect? [Re: J. B.]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 4211
Loc: Up yonder
Can you run the pre-outs and line level speaker outputs simultaneously? I have not ever heard of someone doing that before. Never heard of a sub with both R/L digital inputs either. Sounds like a cool feature. What is your sub, just curious?
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#343840 - 04/01/11 12:02 PM Re: Subwoofer cable vs stereo RCA interconnect? [Re: michael_d]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
A lot of receivers can use the line and speaker level outputs at the same time, but the manuals almost always say not to. That's because of the way the circuit is designed. If the line output is connected to an amp, then the impedance of the circuit changes. That's fine if you calibrate the the line to output a strong enough signal to drive the amp to the appropriate level. But what happens then is the same signal is being used to drive the internal amp, and that can cause trouble.

I don't think he's saying that the sub has digital inputs, but left and right analog ins. I'd guess that about a third of all sub amps are set up that way. No uncommon. Some do get a 6 dB gain when both the left and right are fed the same signal. Again, not a big deal, but needs to be accounted for in calibration.
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#343841 - 04/01/11 12:19 PM Re: Subwoofer cable vs stereo RCA interconnect? [Re: michael_d]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1291
Loc: Quebec, Canada
Michael,
i don't know what "line level speaker outputs" is.

there's line level outputs on preamps and on some prepros, but the signal output of an amplifier is not line level, it can go as high as around 100 volts, but on preamps/prepros line level is less than a volt and the max output can be as high as around 16 volts.

prepros have low level outputs that can't drive speakers (very small amperage/low current)
power amps have high level outputs that drive speakers (many amperes/high current)

that's why preamps consume only small amounts of electricity and why power amps can consume large amounts.

hope this is clear enough. :-)

the sub is SVS PC12+. you can find info on it here:
http://www.svsound.com/products-sub-cyl.cfm
the difference is that mine is last year's and it does not have DSP and the amp is a 525 Watt BASH.
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#343884 - 04/01/11 09:19 PM Re: Subwoofer cable vs stereo RCA interconnect? [Re: J. B.]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 4211
Loc: Up yonder
I probably used incorrect terminology. By speaker line level, I was referring to the amplifier output to the speaker driver. I don't really know why I call them that other than that's what one of my subs calls them. I have not heard of a sub that had R/L RCA. All I've seen is a mono RCA and then the R/L speaker inputs with outputs for running a sub in between the amp and the speakers.

Thanks for the clarification.
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#343889 - 04/01/11 09:53 PM Re: Subwoofer cable vs stereo RCA interconnect? [Re: michael_d]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10634
Yeah, Mike; the terminology has gotten a bit tangled-up here. As Chris mentioned, there's no "digital" connection in question; these are regular analog left and right channel inputs(which some sub amps do have), as the input to amplifiers has to be(even for those class D amplifiers sometimes incorrectly referred to as "digital").

Also, the "simultaneous" connection isn't to the same speaker, but to the separate sub amp as well as the integrated's internal amp. There's nothing wrong with this, and it's just an internal "Y" arrangement, with one branch feeding the internal amp and a parallel branch going to the pre-outs. A parallel connection doesn't form a voltage divider, and voltage to drive both amps can be supplied without difficulty.

As to the original question about the cables, as has been noted, these are all coaxial cables with RCA plugs on the ends; it doesn't matter if they're called "subwoofer", "RCA", "stereo" or whatever. They do vary in the heaviness of their shielding against outside electrical interference, but the typical cables sold by low-cost providers such as MonoPrice(which I use) are fine for use in nearly all home audio environments. No special "high quality" has to be searched for, as these have all the quality needed for the job.
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#343910 - 04/02/11 08:19 AM Re: Subwoofer cable vs stereo RCA interconnect? [Re: JohnK]
J. B. Offline
connoisseur

Registered: 01/19/11
Posts: 1291
Loc: Quebec, Canada
Michael, in case you want to know;
about my subwoofer, it has l/r line level phono inputs and outputs
AND l/r high level inputs and outputs (speaker connectors).
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#343958 - 04/03/11 12:11 AM Re: Subwoofer cable vs stereo RCA interconnect? [Re: J. B.]
audiofan Offline
local

Registered: 03/19/04
Posts: 203
my 2-channel system is pretty much decent , i think : Plinus 9200, Totem Forrest, Ayre CD player. RCA is Discovery . THis cable i bought used but it's already expensive. I just don't want to spend huge amount of $ on subwoofer cable, but not cheap cable neither.

I have several extra subwoofer cables in the house and i will try it first. thanks.

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#343961 - 04/03/11 05:35 AM Re: Subwoofer cable vs stereo RCA interconnect? [Re: audiofan]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
Here's a tip: Sell the snake oil, Discovery cable and use the money to buy a whole line of sensible cables.
_________________________
Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris

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