4 ohm bass drvers vrs 8 ohm help!!!

[slr 5000]

gday all
i have mistakenly ordered 4 ohm bass drivers instead of 8 ohm to use in a 3 way design using ss 2905 9900 tweets, ss 18w8531goo as mid and ss 26w4534g as bass

each cab will have a passive crossover same as troels "jenson " for the mid and tweet

the bass drivers i was planning on running active ,2 per cab connected in parralell in a wtmw arrangement but being 4 ohm this will result in a 2 ohm load , is this ok ,what about series connection instead ?
or should i just get an amp that is happy with 2 ohm to run the bass section

i was going to use a pro amp for the active bass section and a f4 clone per speaker for each passive mid/ high section

also what is best ,,just run the 2 bass drivers per cab over the same frequency or maybe use one as baffle step compensation like a 3.5 way as such

cheers sheafer

[picowallspeaker]

No amp will ever be happy with 2 Ohm loads ! It has to be a 'macho' amp and maybe you could think to dedicate a stereo amp to each woofer section . I see that 'pro' amps can be found at cheap prices , and using two of them would be still less expensive that finding an amplifier capable of driving such low loads ;also some car amps are declared stable till 0.5 Ohm.

[slr 5000]

hi
thanks for your help ,i was afraid this is the case
your idea of using 2 amps for the bass section is a good solution although one that would cost extra money i didnt want to spend

what about series connection instead of parrallel ,this would give me 8 ohm per pair as i understand it but are there any disadvantages to this

cheers sheafer

[AMX_Pete]

You could get an amp that has no problem running 2 Ohm, maybe that's a bit less costly than 2 amps.
There's nothing against putting two 4 Ohm speakers in series to get 8 Ohm charge per channel on the amp. Just a few dB SPL that you won't get out of the low end because power in 8 Ohm is less than on 4 Ohm, but we're talking about 2-3dB. It depends on your SPL needs in that region. If your calculation was a bit on the safe side about amp power, it can work nicely.

[bbggg]

Since your system will have an active bass section, the situation can be salvaged. You can definitely hook up the two woofers in series. There will be a 3 dB drop in apparent sensitivity when compared to the original plan, which can be compensated by adjusting the input level of the bass amps. As for the alternative, I think it is quite plain that any given amplifier will play better with a nominal 8 Ohm load compared to a nominal 2 Ohm load.

[DrDyna]

What's the make and model of the amplifier you're planning on using for the bass section?

[slr 5000]

hi
thanks for the help guys much appreciated

i was planning on running either a pro amd for bass or an f4 pass clone as i have 2 of them
cheers sheafer