fresh1

iTrader: (2)

Soooo heres a question:

Say you're looking to wire some speakers up to get a final load of 4 ohms. You've got 2 4 ohm speakers, and 1 8 ohm speaker.

Is it bad to wire the 4 ohm speakers in series to effectively create an "8 ohm speaker" and then wire this in parallel to the existing 8 ohm speaker to get a final load of 4 ohms?

Mr.DatSubishi

I wouldn't see any harm in it. As long as you have enough power per speaker and crossover points are correct for all. Sounds like an interesting project. Is it home or mobile audio? What r u up to?

Steve Meade did something similar building home tower speakers with car audio components. I was told it wouldn't work very good, but that was from an old school home audio purist. Phfft. Whatever buds.

Do u know anything about passive crossovers? I've got a thread that nobody seems to be able to help with.

fresh1

iTrader: (2)

I was thinking originally of using a Hifonics HFEQ, but then I got to thinking, with a HPF on an amp and the frequency response of some of the speakers, I don't think it would be a problem. I doubt tweeters would try to play 250 hz, and with the HPF set conservatively, the lowest the speakers would try to play is, for arguments sake, 300 hz.

But my biggest concern was just mixing the different speakers like that, assuming power wasn't the issue. As far as I can tell there shouldn't be a problem, but I don't know if anyone has done or does do that.

Anyone else have any thoughts?

Mr.DatSubishi

I will be runnin subs and components at 2 ohms off a 2 channel amp. Each speaker is only gonna do what it's designed to and each passive for the components will do it's job. I will HPF them all at 60-70hz and may put a band pass filter on the sub so it doesn't play too high. Mostly for kickin midbass.

You did mean like 3000hz for tweeters right? If the tweeters play 250 they will die pretty quick.

fresh1

iTrader: (2)

No I meant 300, but the frequency response of the tweeters I'm looking at begins at 1khz, so I am hoping they're not going to bite off more than they can chew based on design alone.

BigRedGuy

iTrader: (11)

As long as your not worried about SQ for these speakers the electrical numbers work.....the power distribution across the 3 drivers will be pretty vague at best so for garage speakers it will make some noise....

You could make a 4ohm stereo system by using caps on the 4ohm drivers to filter out lows and bridging the 8ohm driver across the 2 channels and using an inductor to filter out the higher frequencies....better SQ and the 8ohm driver becomes your mono subwoofer for both channels....

HTH

Mr.DatSubishi

What size are these tweeters? Are they dome or cone style speakers? who makes them? I have some Massive Audio 1" dome tweets that are factory crossed over at 1.4khz and even that s really low.

fresh1

iTrader: (2)

I'm actually looking into some passive crossovers just to make my life easier. I mean if I have to I will probably use some caps to filter out what I don't want, but I have to do some research on them and how the size of the cap will affect the sound. SQ is the goal after all, I've effectively retired from SPL.

Mr.DatSubishi

You could make a 4ohm stereo system by using caps on the 4ohm drivers to filter out lows and bridging the 8ohm driver across the 2 channels and using an inductor to filter out the higher frequencies....better SQ and the 8ohm driver becomes your mono subwoofer for both channels....

HTH[/QUOTE]

This is known as running your amp "tri mode" with passive xovers right? I ve never really tried it. I've never used home made passives. Only factory style component ones.

I may be trying one in the near future as the low pass portion of a band pass xover on a sub.

Mr.DatSubishi

The12volt.com has full calculators for building passives. HPF, LPF, and band-pass are all covers in 1st, 2nd, and 3rd order. I've found it very helpful in my research.