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Post by zarthaz on Apr 24, 2011 22:08:53 GMT -5
Got a Seaton Submersive sub couple of weeks ago and initially ran the supplied XLR to RCA patch lead.
So in other words I was still using the USP-1's RCA sub out.
Just changed over to a full XLR lead so now using the USP-1's XLR sub out but it seems the signal level out is much higher from the XLR sub out as on even low volume the Signal Led on the Submersive blinks and volume of the sub is way higher. So much so that I had to turn the volume on the sub way down to stop localisation of the sub.
The USP is also connected to the UMC -1 but haven't re calibrated that stuff yet, just running 2.1 stereo atm.
Essentially what I want to know is this is due to the XLR output delivering a higher line level output then the RCA out?
Seems odd to me why there would be a big difference in actual output level of either RCA or XLR
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Post by roadrunner on Apr 25, 2011 4:11:50 GMT -5
Frequently, the XLR connector has a boosted output of 2 to 3 decibles so you will definitely need to recalibrate the sub woofer's volume to blend with the rest of the speakers. The boosted output is not always the case. It is up to the manufacturer to decide the relative volume between the XLR and RCA connectors.
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Post by geebo on Apr 25, 2011 9:06:52 GMT -5
I could be wrong on this but here goes:
With a balanced connection, the signal is sent on two of the lines but out of phase with each other. When it gets to where its going, one of those is inverted and combined with the other. Any noise that creeps in during the transmission then cancels itself out since the noise signal would be of the same phase when it gets there then when the one signal is inverted to match the other, the two noise signals are now out of phase and cancellation takes place only on the newly added noise. Combining the two signals would result in a 3db increase in the signal hence the greater volume. I think...
Someone correct me if I'm wrong here.
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Post by stuofsci02 on Apr 25, 2011 11:09:32 GMT -5
geebo,
Thats right...
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Post by geebo on Apr 25, 2011 11:18:01 GMT -5
Yaaay! Geebo got the right answer! |
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Post by zarthaz on Apr 25, 2011 19:00:11 GMT -5
Cool, that explains all of that then.
Did recalibrate the system for the 5.1 stuff and that is sounding allright now, bit more tweaking to be done.
In regards to the 2.1 stuff I think I have to fiddle with the high pass and low pass out filters a bit more on the USP-1, it's not sounding totally right yet.
Wound down the volume on the Submersive and turned the low pass to its lowest point which initially didn't sound too bad but after a bit more listening it's not totally there yet.
Thanks for the info guys, oh and if i remember correct a 3db increase is a doubling of volume, no wonder the sub got so loud then ehe.
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Post by geebo on Apr 25, 2011 19:35:06 GMT -5
Cool, that explains all of that then. Did recalibrate the system for the 5.1 stuff and that is sounding allright now, bit more tweaking to be done. In regards to the 2.1 stuff I think I have to fiddle with the high pass and low pass out filters a bit more on the USP-1, it's not sounding totally right yet. Wound down the volume on the Submersive and turned the low pass to its lowest point which initially didn't sound too bad but after a bit more listening it's not totally there yet. Thanks for the info guys, oh and if i remember correct a 3db increase is a doubling of volume, no wonder the sub got so loud then ehe. No, a 3db increase requires double the power which relates to a small increase in volume. If I remember correctly, it takes a 10db increase for an apparent doubling of volume. That equates to roughly 10 times the power... |
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