#1
so... i went to the local guitar shop today, expressed interest in speakers for possibly building my own bass cab. he said if i took this bass combo away from his shop i could have it.... I cant pass up the free stuff. I took it home, tossed the amp (junk) wired a 1/4 jack up to the speaker wires, plugged it in and it almost sounds great!

so here are the specifics:

My amp - peavey tour 700 (700w 4ohm, 500w 8ohm)

the cabinet or junk combo - nemesis nc-200 (500w max, 200 program?, 2x12" speakers, plus a (hardwired?) horn

basically im wondering if its a safe investment to buy some more powerful speakers for it, that can handle my amp? at the moment its distorting at less than half volume. can I essentially just secure the 1/4 jack, and call it a cabinet?

The amp was plugged into the speakers by one black and one red wire, so I guess the two twelves and the horn are wired in line? will I eventually blow up the horn if i leave it wired like this? would it be better to disconnect the horn? wire it into a control knob?

and now for the most fun part: what speakers? the only thing ive found are speakers that cant handle the amp... always distorting at high volume on the low notes... i hope its weak speakers, and not my amp? anyway, I was some serious speakers, with more than enough capability for my amp, like over 500w each? I dont know, Im new to this. if anyone can help i would really appreciate it
#2
so far all I have found that might fit the bill are Paragon speakers, they make a 300w driver... Ive never heard of them though

also it appears eminence delta series are really powerful. ive found the eminence delta 12a for $90 each, 400w rms, 800w max... that shouldn't distort, right?
Last edited by bpclay1 at May 17, 2014,
#3
Should be fine. Eminence are pretty decent speakers. Those are more PA speakers but they will do bass just fine too.
I would buy 16 ohm ones if you can. Here's why.
1. It cuts it down to 500W by being 8 ohm if hooked up in parallel
2. You'll be able to run it in parallel with another 8 ohm cab. If you use 8 ohm speakers it will be 4 ohm total and therefore unusable with a second cab. Well you could but you'd have to rewire it or make a series cable. Too hard, just buy 16 ohm speakers.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#4
Good to know, they do have 16 ohm speakers... So two 16s together makes it an 8 ohm cab?

What's the difference between wired in series and parallel? You think they're wired in parallel now? Thanks for your response cathbard
#5
Quote by bpclay1
Good to know, they do have 16 ohm speakers... So two 16s together makes it an 8 ohm cab?

What's the difference between wired in series and parallel? You think they're wired in parallel now? Thanks for your response cathbard


Resistance in series adds, but I would never wire a 2x12 in series. It may just be from my work on tube amps, but I've seen a cab wired in series have a speaker open and burn up transformers and tubes. Probably not an issue with a solid state PA, but I would rather design in a way that it fails with a load than fails with no load for anything.

Resistance in parallel is (R1*R2)/(R1+R2) or 1/((1/R1)+(1/R2))
The second equation for parallel can be expanded out by just continuing to add if you have more than 2 resistors like so:

1/((1/R1)+(1/R2)+(1/R3)...+(1/Rn))
#6
Got it, I want parallel... Though, I just thought of something... Where does the tweeter or horn figure in? Shouldn't that bring the ohms down? Maybe I should just eliminate it when I get new speakers? Im not sure I'm all that fond of horns anyway...

So if I'm running two 16ohm speakers and a horn, what might that bring my resistance down to? Depending of course on the horn
#7
Does anyone know about what influence the horn has over the resistance? I feel like it might effect what speakers I order, that I should figure this out...