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Mainly, will any of them be OK with a 400Hz crossover to a mid? Can the specs from PE and the FRD/ZMA files be trusted to gauge useable frequency range?
Modifying a pair of Dahlquist DQ20 speakers I picked up missing the original woofers - which were an Advent-like 10" in a 12" basket with a masonite ring. If you aren't familiar with them, they're really nice speakers utilizing a slanted, time aligned open baffle for the mid and tweeter that sits on top of the woofer enclosure. The tweeter is a Scanspeak D2008 variant and the mid is a Magnat unit.
Decided I'm going to go bi-amp and active between the woofer and mid.
The cabinets measure in at 1.3 ft3 and they are sealed, and I would like an f3 into the 20s. I'll make a reducer ring to downsize the woofer cutout from the original driver to whatever the RSS265 needs. I can also either vent them, or go PR(maybe).
I know the RSS series has been used as the bottom of a 3 way before, nothing new there, but from what I can tell they all crossed over to the mid no higher than 2-300Hz. I'd like to keep the mid section crossover intact and that is at 400Hz.
Looking at just the specs provided by PE, it becomes obvious that I'll have to vent the enclosures and the HO-4 would work best, as after driver and vent displacement I should come out somewhere close to the 1 ft3 at 28Hz f3 that PE specs - but it also has the lowest specified useable range up top at 600Hz. With that, I could(although I'd prefer not to) cut out the back of the enclosure and add an extension to gain some internal volume to potentially accommodate the HF-4.
According to PE-
HO-44 - 1.5 ft3, 25Hz f3, 25-600Hz
HO-4 - 1 ft3, 28Hz f3, 24-600Hz
HF-4 - 1.5 ft3, 27Hz f3, 22-1000Hz
HF-8 - 1.9 ft3, 23Hz f3, 25-2000Hz
HE-22 - 1.5 ft3, 28Hz f3, 25-900
The photos below aren't mine, just posting them up for reference.
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Modifying a pair of Dahlquist DQ20 speakers I picked up missing the original woofers - which were an Advent-like 10" in a 12" basket with a masonite ring. If you aren't familiar with them, they're really nice speakers utilizing a slanted, time aligned open baffle for the mid and tweeter that sits on top of the woofer enclosure. The tweeter is a Scanspeak D2008 variant and the mid is a Magnat unit.
Decided I'm going to go bi-amp and active between the woofer and mid.
The cabinets measure in at 1.3 ft3 and they are sealed, and I would like an f3 into the 20s. I'll make a reducer ring to downsize the woofer cutout from the original driver to whatever the RSS265 needs. I can also either vent them, or go PR(maybe).
I know the RSS series has been used as the bottom of a 3 way before, nothing new there, but from what I can tell they all crossed over to the mid no higher than 2-300Hz. I'd like to keep the mid section crossover intact and that is at 400Hz.
Looking at just the specs provided by PE, it becomes obvious that I'll have to vent the enclosures and the HO-4 would work best, as after driver and vent displacement I should come out somewhere close to the 1 ft3 at 28Hz f3 that PE specs - but it also has the lowest specified useable range up top at 600Hz. With that, I could(although I'd prefer not to) cut out the back of the enclosure and add an extension to gain some internal volume to potentially accommodate the HF-4.
According to PE-
HO-44 - 1.5 ft3, 25Hz f3, 25-600Hz
HO-4 - 1 ft3, 28Hz f3, 24-600Hz
HF-4 - 1.5 ft3, 27Hz f3, 22-1000Hz
HF-8 - 1.9 ft3, 23Hz f3, 25-2000Hz
HE-22 - 1.5 ft3, 28Hz f3, 25-900
The photos below aren't mine, just posting them up for reference.
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