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Re: Multiple EP’s, daisy chain or…???
michael_d #299139 03/29/10 02:02 AM
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Mike, as usual, MonoPrice is more reasonable.


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Re: Multiple EP’s, daisy chain or…???
JohnK #299150 03/29/10 03:21 AM
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and nothing wrong with Blue Jeans cable either. You are just paying a little more with better aesthetics


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Re: Multiple EP’s, daisy chain or…???
SirQuack #299226 03/29/10 06:50 PM
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Can someone explain to us new folks what's the difference between calibrating one sub at a time & two together. It sounds like one way you may tune up and the other tune down???




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Re: Multiple EP’s, daisy chain or…???
Wid #299283 03/30/10 01:58 AM
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Do you just need to use an ordinary RCA splitter? Or a Y cable designed specifically for subwoofer cables?


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Re: Multiple EP’s, daisy chain or…???
SatKartr #299284 03/30/10 02:02 AM
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A ordinary splitter would work just fine.


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Re: Multiple EP’s, daisy chain or…???
SatKartr #299295 03/30/10 03:08 AM
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Sat, as Ken indicated, all Y-splitters are "ordinary". There are no specially designed subwoofer cables(regardless of seller labeling); all these are simply coaxial cables with an RCA plug on each end, and there would be no need for anything different in other cabling connected to them.


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Re: Multiple EP’s, daisy chain or…???
JohnK #299299 03/30/10 03:26 AM
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OK just checking, that's what I thought. I don't understand the difference between a coaxial cable and an ordinary RCA interconnect cable (is there one?), hence my fuzziness still.

I couldn't scrounge up a splitter and the(coaxial) cable I have isn't long enough to daisy chain so I used an XLR microphone cable to daisy chain from the new sub to the old. So I am running an unbalanced coaxial cable to the new 800 and then daisy chaining via an xlr balanced cable to the old 800.

Will the balanced XLR connection be a lower power level output (i.e., will the old sub receive less signal) and will that create an issue with balancing the levels between the subs (aside from any other differences caused by different amps etc). On first blush the old sub seems to have less volume but again I am wondering if the cabling might have anything to do with it or not. I'll probably get to calibrating tomorrow but just wondering theoretically if the levels will be different due to balanced versus unbalanced inputs to the subs.


"If you try to turn toward it, you go against it."
Re: Multiple EP’s, daisy chain or…???
SatKartr #299304 03/30/10 03:49 AM
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So I put a low Z to high Z (impedance) transformer on the end of the XLR cable, the transformer terminates in a 1/4 inch phone plug, if that's still the term, and then used an adaptor to convert that to an RCA input. Plugging that into the old sub, it seems like the levels are pretty close now.


"If you try to turn toward it, you go against it."
Re: Multiple EP’s, daisy chain or…???
SatKartr #299308 03/30/10 04:08 AM
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Sat, another point of terminology is that there are actually no "RCA cables"(despite labeling), since "RCA" is the name of the plug at the ends, not the cable itself. Sometimes the term is applied rather imprecisely to a cable that isn't of the 75ohm impedance suggested for most digital connections.

As I pointed out in the reply to Mike Drew's thread, the cable itself can't make a connection balanced, and in your case both subs are operating with an unbalanced connection, despite the difference in the form of the cables. In a true balanced connection the receiver or separate pre-amplifier has to be able to output two voltages instead of one, with the second voltage being of opposite polarity. These two voltages then ride along the two center conductors(compared to one in a coaxial cable)into the amplifier. If any external interference hits the two conductors it would be nearly equal in amplitude if they're close together and would be of the same polarity. If the amplifier has balanced circuitry, it reverses the polarity on one of the conductors so that the two original signals are again of the same polarity and their voltages add, which doubling of voltage is an increase of 6dB(rather than the 3dB in a doubling of power). The noise voltages however are now of opposite polarity and tend to cancel each other, which is why a true balanced connection has greater interference rejection. If the gain on the balanced circuit in the amplifier was the same as that on its unbalanced circuit the balanced input would result in a 6dB louder level. To compensate and equalize the levels, the gain in the balanced circuitry is typically set 6dB lower. Sometimes if this compensation isn't made, or isn't fully made, the louder result on the balanced input will give the misimpression that it's of higher quality, although it's actually just a volume difference.


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Re: Multiple EP’s, daisy chain or…???
JohnK #299319 03/30/10 04:49 AM
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Interesting, I think I see that now, I thought the amp in the first sub would allow a balanced output even though the input from the 3808 is unbalanced. Still, if I understand correctly, the xlr input circuitry to the sub is set to a lower gain than the line (rca) input circuitry, no? Anyway the transformer for the xlr cable seems to be working to put the 2 subs in the same ballpark volumewise, so to speak. Otherwise they seemed too disparate in volume as a starting point to conveniently adjust the volumes toward a point of balance.


"If you try to turn toward it, you go against it."
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