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[Dave Dermont]

Hoo boy...

I realize that this is a place where a relative newcomer can get advice, but let's step back and look at the situation here.

The original poster has a pair of SB750 subwoofers, and wants to drive them with a single QSC RMX2450.

He can not identify that the subs are wired as two circuits of an NL4.

He does not know how to hook up a power amp in bridged mode.

Even if he DID know how to hook things up properly, he has no idea why hanging four woofers off a single bridged stereo power amp might not by a good idea.

There are just too many things wrong here.

I suggest Mr. Webb go back and learn some basics before doing anything else. Maybe he could start with the owners manual of the QSC RMX2450?

What's his next post going to be?

Maybe it will be about how the SB750 is such a terrible subwoofer, or how easy it if to blow up a QSC RMX2450?

I really am trying to help here.

Honest

[Mike Bamber]

Now I remember a few QSCs outputting channel B on +2 -2 of an NL4.

So maybe the easiest solution is to obtain some 4-core speakon cable, plug it into output A, hit the mono switch, and take it out of bridge mode.

[Rob Spence]

Now I remember a few QSCs outputting channel B on +2 -2 of an NL4.

So maybe the easiest solution is to obtain some 4-core speakon cable, plug it into output A, hit the mono switch, and take it out of bridge mode.

Pretty much any QSC amp I have seen in many years has both channels available of the channel 1 NL4 as you describe it. Makes it easy to hook up what he has if only he has 4 wire speakon cables (I note that banjo center only caries the 2 wire variety).

[Michael Webb]

Hoo boy...

I realize that this is a place where a relative newcomer can get advice, but let's step back and look at the situation here.

The original poster has a pair of SB750 subwoofers, and wants to drive them with a single QSC RMX2450.

He can not identify that the subs are wired as two circuits of an NL4.

He does not know how to hook up a power amp in bridged mode.

Even if he DID know how to hook things up properly, he has no idea why hanging four woofers off a single bridged stereo power amp might not by a good idea.

There are just too many things wrong here.

I suggest Mr. Webb go back and learn some basics before doing anything else. Maybe he could start with the owners manual of the QSC RMX2450?

What's his next post going to be?

Maybe it will be about how the SB750 is such a terrible subwoofer, or how easy it if to blow up a QSC RMX2450?

I really am trying to help here.

Honest

     no i have 10 qsc 2450s i run 1 per cab been using jbls and the eaw are wired different got them going and they are a louder box than the jbl buying 4 more thanks for all your support....

[Michael Webb]

Hoo boy...

I realize that this is a place where a relative newcomer can get advice, but let's step back and look at the situation here.

The original poster has a pair of SB750 subwoofers, and wants to drive them with a single QSC RMX2450.

He can not identify that the subs are wired as two circuits of an NL4.

He does not know how to hook up a power amp in bridged mode.

Even if he DID know how to hook things up properly, he has no idea why hanging four woofers off a single bridged stereo power amp might not by a good idea.

There are just too many things wrong here.

I suggest Mr. Webb go back and learn some basics before doing anything else. Maybe he could start with the owners manual of the QSC RMX2450?

What's his next post going to be?

Maybe it will be about how the SB750 is such a terrible subwoofer, or how easy it if to blow up a QSC RMX2450?

I really am trying to help here.

Honest      you need to read again 1 amp per cab bridged wake up....

[Pete Sams]

The EAW's are wired in what's called "discreet mode", each woofer uses a different set of pins on the NL4. If you're trying to bridge 1 amp per box then there are several options:

Use a dual banana to NL4 cable: each banana wired to a different set of pins. On the amp end plug one banana end into the back of another (note polarity here) and plug both into the red terminals of the amp.

Use 2 conductor, jumper pins 1 +/- to pins 2 +/- on the speaker end, wire Pins 1+ and 2+ on the amp end

BEST ADVICE: build a patch panel prewired to your amp and use standard NL4 cable.

[Ken Barlow]

NL4 Two Driver Subs:
Pin 1-   Driver 1 negative
Pin 1+   Driver 1 positive
Pin 2-   Driver 2 negative
Pin 2+   Driver 2 positive
Except DCS2, FR250z, LA128, LA128z, & SBX220
pin 2- = negative
pin 2+ = positive
pins 1-/+ = loop through

credit: EAW application support pages

Basically you are going to need to make a cable with +1 and +2 ,-1 and -2 tied together there are a couple other ways to do it as well but thats it. If you dont care about having the cabinet "STOCK" you could move the + and - 2 wires in line with + and - 1 wires.
T

[Ken Barlow]

If you dont care about having the cabinet "STOCK" you could move the + and - 2 wires in line with + and - 1 wires.
T

I did this to my SB 250's. 4 ohm load, works great. Make sure you label the sub if you go this route so no one makes the mistake of trying to jump up to a full range cab from the other NL4.

Best of luck,
KB

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