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05-17-2009, 12:45 PM
|  | Registered User | | Join Date: Dec 2002 Location: Virginia Beach, VA | | | Bridged Output: "Y" or Daisy-Chain?
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I need to re-cable the bridged output of a QSC RMX 1450 into (2) 8 ohm enclosures. I figure the total run wil be no more than 35'. As I understand it, I have two options: (a) run a single cable to one cab then daisy chain to the second or (b) stack two banana plugs and run two parallel cables, one for each enclosure. Either way, I'll end up with a total 4 ohm load but I'm more concerned with resistance / heat issues.
I appreciate any input...pardon the pun.
Riis
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"20% of the money will buy you 90% of the sound..another 30% of the money will buy you another 5% of the sound..you can't buy the remaining 5% of the sound because nobody can agree about what it is." |
05-17-2009, 02:52 PM
| | Registered User | | Join Date: Sep 2008 Location: Oregon | | | I always make I/O panels for the backs of my racks, then the speaker cable just plug into those. That way, I can use what ever pre made cable suits the length need at the time. Short a run as possible. AC, XLR signal, and NL4/8's all on panels. Plug play.
11 and 12 guage speaker cables.
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05-17-2009, 05:01 PM
| | Registered User | | Join Date: Dec 2002 Location: Virginia Beach, VA | | Quote:
Originally Posted by GregShadoan  I always make I/O panels for the backs of my racks, then the speaker cable just plug into those. That way, I can use what ever pre made cable suits the length need at the time. Short a run as possible. AC, XLR signal, and NL4/8's all on panels. Plug play.
11 and 12 guage speaker cables. | A bit more than what I need but the "short a run as possible" reference makes sense.
Riis
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"20% of the money will buy you 90% of the sound..another 30% of the money will buy you another 5% of the sound..you can't buy the remaining 5% of the sound because nobody can agree about what it is." |
05-17-2009, 09:58 PM
| | Registered User | | Join Date: Nov 2003 Location: Indianapolis, IN | | I doubt there will be a performance difference so long as you are using decent (12 or 13 gauge) cable.
I never run speaker cables directly to the connectors on an amp. If something wears out or gets broken, I want it to be a panel connector that easy and cheap to fix myself, instead of having to take my amp in for an expensive repair. http://www.padrick.net/LiveSound/Rac.../RackStuff.htm
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05-18-2009, 10:24 AM
| | Registered User | | Join Date: Oct 2008 Location: Halifax, NS, Canada | | | Stacked banana plugs always make me nervous.
I'm curious why Bridge here? Why not Y the signal into both channels then output to each speaker? |
05-18-2009, 03:23 PM
| | Registered User | | Join Date: Sep 2008 Location: Oregon | | Quote:
Originally Posted by JustDavid Stacked banana plugs always make me nervous.
I'm curious why Bridge here? Why not Y the signal into both channels then output to each speaker? | The rmx 1450 outputs 280 per ch into 8 ohms in stereo mode.
Mono bridged into 4 ohms is 1400 watts.
So instead of feeding each sub 280 watts in normal stereo mode, mono bridge sends 700 watts to each box.
Also, that amp has a feature that allows use of ch1 nl4 for bridgeing, so you would not have to use bananas. Make yourself a little nl4 (to amp pins +1,+2) to two female nl4 (to speakers pins +1, -1 ) then everyting would be locking, and not work loose.
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05-18-2009, 03:30 PM
| | Registered User | | Join Date: Dec 2002 Location: Virginia Beach, VA | | Quote:
Originally Posted by GregShadoan The rmx 1450 outputs 280 per ch into 8 ohms in stereo mode.
Mono bridged into 4 ohms is 1400 watts.
So instead of feeding each sub 280 watts in normal stereo mode, mono bridge sends 700 watts to each box.
Also, that amp has a feature that allows use of ch1 nl4 for bridgeing, so you would not have to use bananas. Make yourself a little nl4 (to amp pins +1,+2) to two female nl4 (to speakers pins +1, -1 ) then everyting would be locking, and not work loose. | +1 on all points. I'm finding the Speakons will fit just about any application with the exception of my Crest CA-6 which only has binding posts.
Riis
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"20% of the money will buy you 90% of the sound..another 30% of the money will buy you another 5% of the sound..you can't buy the remaining 5% of the sound because nobody can agree about what it is." |
05-18-2009, 03:30 PM
| | Registered User | | Join Date: Oct 2008 Location: Halifax, NS, Canada | | | Thanks Greg.
For politeness also; the wattage item deserved a RTFM. |
05-18-2009, 03:30 PM
| | Registered User | | Join Date: Sep 2008 Location: Oregon | | | Panels are def the better way though.
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05-18-2009, 04:05 PM
| | Registered User | | Join Date: Sep 2008 Location: Oregon | | Quote:
Originally Posted by JustDavid Thanks Greg.
For politeness also; the wattage item deserved a RTFM. | I'm sorry if my reply seemed impolite. It was not my intension. If that is how you preceived it, I apoligize 
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Rickenbacker Club- #186
Low B- Low E- Whatever it takes.
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05-18-2009, 08:14 PM
| | Registered User | | Join Date: Oct 2008 Location: Halifax, NS, Canada | | | No no!!
Some days it seems I can't ask what time it is without sounding sarcastic. I apologize!
Your reply WAS polite. I was trying to underscore that, & also say I realized I should have looked into the amp before posting. | | Thread Tools | Search this Thread | | | | 
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