• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Adding woofers to 2-way cabs

loafeye

Member
Joined
Oct 25, 2022
Messages
20
Likes
7
Location
the weeds
I have a spare pair of (passive) 2-way speakers. I'd like to add the use of the woofers in the spare set to the passive 2-way speakers I have in service now.
I don't want to break into the sealed enclosures of either set to re-wire them with new 3-way crossovers (bad idea as drivers not optimized for such- I'm known to myself as a not-a-speaker designer).
If I had a pair of passive sub-woofer crossover filters, I could run the speaker-out cables from my amp to the sub crossover and through it, so I'd be using the woofers in one speaker pair and the other speaker pair would get all the frequencies above the sub crossover frequency, whether it's 80,100,120,200 Hz, whatever.

This is just a lark, where the spare 2-way speakers are currently useless, and I might realize improved sound by carving up the frequencies between the two woofers, in a sense, making one of them a "mid-woofer" and using the tweeter in the same cabinet. If I don't like the result, I can just disconnect the spare pair and continue to use the speakers as I have now, which would be fine.

The trick is, I can't find a passive sub-woofer crossover, and I'm incapable of designing one. If I at least had a schematic and the parts were available, I could probably solder the chokes, resistors, and caps together to get the job done, but a known-to-work-already-built crossover would probably be the smarter move on my part.
My thanks for any suggestions.
 

fpitas

Master Contributor
Forum Donor
Joined
Jul 7, 2022
Messages
9,885
Likes
14,154
Location
Northern Virginia, USA
Passive subwoofer filters are like hen's teeth, because they're the size of a small car and expensive. DSP is generally used now, although there are a few line-level op-amp solutions available.
 
OP
L

loafeye

Member
Joined
Oct 25, 2022
Messages
20
Likes
7
Location
the weeds
Passive subwoofer filters are like hen's teeth, because they're the size of a small car and expensive. DSP is generally used now, although there are a few line-level op-amp solutions available.
Thank you for the lead-in/pointer. For the purpose I'm asking after above, to use a DSP it seems I'd need a second 2-channel amp for the passive speaker pair I want to add, and then be restricted to using a volume control upstream of the DSP.
 
Top Bottom