Rewiring speaker jack ext. from series to parallel?

[wyleeboxer]

OK how do I rewire my output speaker ext. jack on the back of my 115 combo from series to parallel? Do I just reverse the 2 wire connection to the speaker jack? Thanks

[MuzikMan]

No. Doing that would create a series connection with phase issues. You would probably be better off having a qualified technician wire a new jack in parallel and leave the existing one alone.

[wyleeboxer]

So wire direct from the + - of the internal speaker and then to a new jack + - ? and leaving the existing series jack on the back panel alone and not disconect it?

[MuzikMan]

Yes, that is correct.

[wyleeboxer]

Originally Posted by MuzikMan

Yes, that is correct.

Ok that sounds easy enough, thanks again!

[walterw]

what kind of amp has a series extension speaker jack?

that's pretty rare.

[Bassamatic]

Yeah - I thought that all extension jacks were in parallel. Check with the maker.

[wyleeboxer]

Trust me long story... Check my Eden Rant thread here from a few weeks ago. Its for sure a series ext. jack for all the Nemesis combos.

[Bob Lee (QSC)]

Originally Posted by walterw

what kind of amp has a series extension speaker jack?

that's pretty rare.

I'll say.

Better double-check. And make sure whoever you speak to knows the difference between series and parallel.

[KJung]

Originally Posted by wyleeboxer

Trust me long story... Check my Eden Rant thread here from a few weeks ago. Its for sure a series ext. jack for all the Nemesis combos.

Careful! There are some low end combos with 4ohm internal cabinet impedance that use a series jack to allow you to add a second cab without blowing up the amp (i.e., a parallel jack results in an under 4ohm total nominal impedance if you add an extension cab).

There was probably the reason that they did this.

[fenderhutz]

Good grief, a brief overview of our anomaly of an amp.

Nemesis RS combos are wired in series, all of them. They goofed up on the 15 inch version and put in an 8ohm in and didn't change the wiring. The only "good" reason for this is it was a Chinese plant oversight. Eden customer service doesn't even acknowledge this, but it has tested series. All of the other RS combos are 4 ohms and this makes sense, the 15 however is only rated at 250 watts at 8 ohm. The amp is rated at 320 4ohm.They kept it series (again plant issue) so I get a 16 ohm load with the matching extension cab and roughly 100 watts per cab. I want that extra wattage per cab that I paid for.

So please don't make this another DON'T DO IT! thread.

I have the same amp and have the same question.

[KJung]

Originally Posted by fenderhutz

Good grief we are reinventing the wheel here.

Nemesis RS combos are wired in series, all of them. They goofed up on the 15 inch version and put in an 8ohm in and didn't change the wiring. The only "good" reason for this is it was a Chinese plant oversight. Eden customer service doesn't even acknowledge this, but it has tested series.

So please don't make this another DON'T DO IT! thread.

I have the same amp and have the same question.

I can see how this would happen, and probably was a 'production simplification' decision on a low end unit (i.e., not varying the external jack design across the different combo units, which I assume mostly have internal 4ohm impedance).

[fenderhutz]

Originally Posted by KJung

I can see how this would happen, and probably was a 'production simplification' decision on a low end unit (i.e., not varying the external jack design across the different combo units, which I assume mostly have internal 4ohm impedance).

These "low end" units retailed at almost 1000 and sold for about 800 out the door. The series board is actually mounted in the cab and not the amp itself, should be easy to bypass as long as the crossover for the tweeter isn't part of the equation.

If it is I am just going to toss a 4 ohm 15 NEO rated for the cab size and use the amp for it's intended purpose.

[KJung]

Originally Posted by fenderhutz

These "low end" units retailed at almost 1000 and sold for about 800 out the door. The series board is actually mounted in the cab and not the amp itself, should be easy to bypass as long as the crossover for the tweeter isn't part of the equation.

Wow, $800 for a Nemesis combo. Go figure!

[Wes Whitmore]

Are we talking about the RS115? It's 8ohm right on the Eden website. The manual is pretty useful. Since all of the combos except for the RS115 are 4 ohm, and 4 ohm appears to be the minimum rating of the amp section (although there is a reference to not running the amp lower than 2ohm in the manual), series was the safe way to allow people to use ext cabs. Since the RS115 is using an 8 ohm internal speaker, it would be fine to rewire that jack (or just mount one in the enclosure, tapped off the internal speaker +to+ and -to-). That way you keep the series capability if you want to use it someday. That new extension jack is good for another 8 ohm cab bringing total ohm load down to 4 ohms for the RS115.

extra stuff - You will have to check how that internal speaker switch is wired, but it kills the tweeter and woofer when you flip it in the off position. It would be nice to be able to wire the ext jack up so you can flip the internal speaker off, but still run up to a 4 ohm extension cab (instead of just an 8 ohm when running the internal speaker). It might already be wired to do that. You will have to verify.
The tweeter crossover point might change when you plug in another cabinet, but that was happening anyhow when you plugged in the ext series cab, so you are in no worse shape. Maybe Eden has that tweeter circuit separate from the woofer and it isn't an issue.
Good luck!
Wes

[wyleeboxer]

Hi guys, I assume I can (Wes) that I can just disconnect the series ext. jack and cap the those wires? I'm using the original series jack hole for the new parallel jack and dont want to have the series jack coming loose in the amp area... thanks again!

[MysticMichael]

Originally Posted by KJung

Wow, $800 for a Nemesis combo. Go figure!

I paid a bit more than $800 for my Nemesis NC410 combo. And that was in 1997.

Of course, it was the 4x10 version - not the 1x15 version. And this was in New York. So that factors into it...

MM