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Stupid newbie question, but I can't figure it out.....


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#1 of 11 OFFLINE   Nick Graham

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Posted March 31 2003 - 12:28 PM

I am about to wire a pair of JBL N24 IIs to be my rear center channel for Dolby EX and DTS ES. My question is this....how do I do it? The receiver has one set of binding posts meant for one speaker, and I suppose using a generous helping of speaker wire and electrical tape I could do something really sloppy looking and maybe half-way decent sounding, but I figure since so many people do this there has to be a better, more professional looking way.

Any suggestions?

#2 of 11 OFFLINE   Robb Roy

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Posted April 01 2003 - 12:57 AM

Nick,

My guess is your receiver is not prepared to take on both of those speakers in a 7.1 configuration, but rather just 6.1. If I were you, I'd wire just the one rear center speaker, and put the other in a closet until you eventually get a 7.1-ready receiver.

-Robb

#3 of 11 OFFLINE   John Kotches

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Posted April 01 2003 - 01:17 AM

Nick,

You have to wire the speakers in series to use two speakers off of one output. Wiring the speakers in parallel will almost certainly present a load that your receiver will balk at driving.

Take the Red/+ output of the receiver and connect it to the Red/+ input of the first speaker. Connect the black/- output of the first speaker to the Red/+ of the 2nd speaker. Connect the black/- output of the 2nd speaker to the black/- output of the receiver.

Wiring the speakers in series doubles the impedance seen by the receiver, which will effectively cut in half the output of your receiver. But you're doubling the number of speakers, which will double the acoustic output as well, leaving you in a break even position acoustically Posted Image

Regards,
Surround Music Enthusiast / Curmudgeon in Training
Opinions are my own, not representative of the publication I write for.

#4 of 11 OFFLINE   Phil Iturralde

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Posted April 01 2003 - 02:42 AM

Nick, ... the following is a copy of the email I 'Replied' to you earlier this morning, basically confirming / agreeing w/John Kotches post above ...

====(email copy - edited for inbedded HTML codes & added image)
Quote:
>>... is there any feasible way to wire them BOTH to the single rear center channel?<<

Yes there is! To keep the speaker load above 8 ohms, you must hook them up in "series".

Once you install your speakers in the rear Center R&L location, hook them up as follows:

1) AV REC Rear Center - (NEG) wire > Left rear Center - (NEG)

2) Left rear Center + (POS) > Right rear Center - (NEG)

3) Right rear Center + (POS) > AV REC rear Center + (POS)

For a diagram, go to this website (see Series Hookup) ...

NOTE: Series vs. Parallel:
Posted Image

- Hooking two N24II (8 ohm rated) together in "series" will equal an 16 ohm load, a very easy load for your AMP to handle.

- Hooking two N24II (8 ohm rated) together in "parallel" will equal an 4 ohm load, and if your Rear Channel AMP can handle this load, you may want to try it.

Have fun hooking them up and let me know how it goes!
====(end of email copy)

Phil
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#5 of 11 OFFLINE   Cees Alons

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Posted April 01 2003 - 03:09 AM

Nick,

Wiring them in series will also help making it as "unsloppy" as it can Posted Image.

I suppose the speakers are going to be rather close together. If they're not see the second paragraph.
Just use the normal double wire to go from your receiver to both speakers. Split the two wires a bit wider than normal, just enoug to connect one to the (red or + or whatever color) connection of one speaker and the other to blue (or - ot whatever other color) of the other speaker. Now connect a single wire between the yet-unused plugs of the two speakers.

If the speakers are going to be relatively wide apart, you can do it "neatly" as follows: bring the double wire from the receiver to one of the speakers (a) and then proceed to the other speaker (b). Connect the two wires to the last speaker (b). Now cut one of the two wires at the position of the first speaker (a). Split them a bit. Of the wire you just cut, connect the end coming from the other speaker (b) to the binding post on this speaker (a) with a different "color" (see above) than that same wire is already on at the far speaker (b). Connect the other end (coming from your receiver) to the other binding post of speaker (a).

Hope this was clear enough. Posted Image
Good luck!

Cees

#6 of 11 OFFLINE   Bob McElfresh

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Posted April 01 2003 - 03:18 AM

Great picture there Phil. Posted Image

Radio Shack has a good selection of banana plugs that you can use to rig things together. Look at the dual-banana plugs (xxx-308). I used these under a couch to series/parallel wire 8 bass shakers. They also have the single bananas (xxx-306).

I use 2 of the Dual Bananas to get the signals to the rear of my couch and give me a connection point. Then I use the single bananas to 'flow' the signal through the bass shakers.

#7 of 11 OFFLINE   John Kotches

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Posted April 01 2003 - 03:29 AM

Phil,

You should add + / - indicators to the amp on your drawing so that it's perfectly clear what gets wired to what from that side.

Regards,
Surround Music Enthusiast / Curmudgeon in Training
Opinions are my own, not representative of the publication I write for.

#8 of 11 OFFLINE   Edward J M

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Posted April 01 2003 - 03:38 AM

Nick, does your AVR have a pre-out for the rear surround? Before I got a true 7.1 receiver, I used my rear surround pre-out connected to a Y splitter, and ran two cables to the L/R analog inputs of a spare amp and powered my two rear surrounds that way. Worked like a charm.

While I just happened to have a spare high quality 2 channel Harman/Kardon amp lying around, you can do the same with a $70 Sherwood (or equivalent) 100 WPC stereo receiver. Potential sonic mis-match issues aside, I don't think the small rear surrounds in a high-passed configuration will place much of a demand on any amp, even an inexpensive stereo receiver.

Just a different twist instead of wiring in series.

Regards,

Ed
Ed Mullen
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www.svsound.com

"What we do in life, echoes in eternity."


#9 of 11 OFFLINE   Phil Iturralde

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Posted April 01 2003 - 04:19 AM

Quote:
Phil,

You should add + / - indicators to the amp on your drawing so that it's perfectly clear what gets wired to what from that side.

Hi John, (enjoy all your posts by the way), ... you're right, ... and if I created the diagram, ... that would be my first edit!

But, I can't take credit for the above diagram, it's owned by "Duncan Electronics"

Phil
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#10 of 11 OFFLINE   John Kotches

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Posted April 01 2003 - 05:36 AM

Phil,

Damn you! I still want you to fix their drawings Posted Image

Regards,
Surround Music Enthusiast / Curmudgeon in Training
Opinions are my own, not representative of the publication I write for.

#11 of 11 OFFLINE   Phil Iturralde

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Posted April 01 2003 - 06:22 AM

Quote:
Damn you! I still want you to fix their drawings Posted Image

Posted Image Posted Image Posted Image :P)
My HT Enthusiasts Google Website
---- Toshiba 62HM196 62" 1080p DLP HDTV pic's (#1 in Consumer Reports)
DVD Aficionado (DVDAF) on-going list.
Acquisition Rule #59 “Free advice is seldom cheap.” (Quark @ DS9)
JBL S-Series + SVS 25-31PCi (SN: 00034) w/NSD Upgrade!





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