Heres one for the uber smarties here!

Ryan from Ohio · Post by **Ryan from Ohio** » Sat Mar 04, 2006 6:42 pm

Ok...

10 pcs of 4 Ohm spealers = What Ohm?

Its easy to figure when your running 2,4,8 and so forth, but what happens when you get off that path?

Where does it go from here? How to wire... Its even got me stumped...

Shopping for an amplifier and I dont know what to get...

geolemon · Post by **geolemon** » Sat Mar 04, 2006 6:50 pm

"divide and conquor"

Let's assume you aren't going to be straight-up parallel wiring them... that would yield you (4/10=...) 0.4 ohms of final load.

And I'm assuming you aren't going to be series wiring them... besides involving likely a hefty wire gauge, you'd have a 40 ohm load.

Really, the only practical option is to either:
1) series wire two sets of five, for two 20 ohm loads, then parallel those two sets together to get you a 10 ohm load... for all intents and purposes, that's not far off of an 8 ohm load - run a stereo amp bridged possibly.

2) parallel wire two sets of five, for two 0.8 ohm loads (essentially 1 ohm), and then series wire those resulting sets for a final load that's "close enough to 2 ohms" to count. Just don't run it on a flea-market amp.

OR, take the easy way out:
Run 8 of them, series/paralleled (four series pair = 8 ohms x 4, then parallel those four pair together) to give you a 2 ohm load).
And you'd have two spares.

Or... you could run the 10 on 5 small amps at 2 ohms each.

Hey, the options just don't stop!

Jonathan · Post by **Jonathan** » Sat Mar 04, 2006 6:56 pm

You could wire five of them in parallel, and the other five in parallel, then those branches in series for a 1.6 ohm load. Probably your only usable option. Other options could give you a final 10 ohm load.

Are you talking about those little 5W speakers for the Beretta?

Jonathan · Post by **Jonathan** » Sat Mar 04, 2006 6:57 pm

Didn't see Geos post :)

Ryan from Ohio · Post by **Ryan from Ohio** » Sat Mar 04, 2006 7:11 pm

1.6 Ohmmmmmmmsssss weeee

That will work out pretty good then. Considering the 4 4Ohm tweeters that will require 60WRMS between the 4...

:)

So now Im looking for a four channel amp with an output of 50 WRMS in 2 Ohms...

:)

I just was thinking about this scratching my head... Thanks for the help. Not to often someone has such a weird configuration...

Yes for the beretta... Same with that MSI Mega 180 Car/Home PC I posted about... hehe

William from NOLA · Post by **William from NOLA** » Sat Mar 04, 2006 8:27 pm

Sounds like a Franken-Beretta

Post by **GlassWolf** » Sun Mar 05, 2006 7:23 am

I vote active crossover network with one amp per speaker!!

*runs and hides*

geolemon · Post by **geolemon** » Sun Mar 05, 2006 1:05 pm

Jonathan wrote: Are you talking about those little 5W speakers for the Beretta?

Just saw this...

If they are that low, I'd suggest wiring them series/parallel for a 10 ohm load...

...and then just wiring them to a bridged stereo amp:
If it was good for, say, 100w at 4 ohms bridged, chances are it'll be just about dead on 50w at 10 ohms.

And that seems good for little 5w speakers - 10w per each but who's counting? I'm sure they must be able to handle more.
And a 100w stereo amp - I'm assuming this is for a little fun experiment- can be found for cheap just about anywhere.

Ryan from Ohio · Post by **Ryan from Ohio** » Sun Mar 05, 2006 1:52 pm

Ya the $0.50 NSB's on parts express.

I want to run a 4 channel amp to them and the tweeters.

So 1 channel to each group- LTweets, L Mids, R Tweets, R Mids...

geolemon · Post by **geolemon** » Sun Mar 05, 2006 7:13 pm

Higher impedence = higher sound quality - bear that in mind too.

Lower distortion specs, primarily... more headroom, unsaturated power supply, etc.

I thought Parts Express sold out on them a while ago?

:

I bought 40 of them myself - intend on using 32 of them (was worried about DOA's)... haven't built my big tall dipole line-arrays yet (haven't finished my Tiki room yet though either

).