I just bought six 8" Peerless drivers from a guy who took them out of a Rodgers organ, circa 1990. They all had a case of foam rot so I got them on the cheaps. Catalog number 831556 and Qc 910304. Google doesn't turn up much. Anybody have specs on these? Any suggestions what I can do with them?
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Google turns up a LOT for the Peerless 831556. Like it is replaced by a Peerless 832737 these days in stuff like the Gale GS401.
Repairing Rodgers Organ Speakers
In fact the original Rodgers FR 1.7LX picture tells you a lot too, since a reflex is usually sized close to the Vas with a Qts around 0.4.
FR 1.7LX Three-Way Tuned Port Enclosure Speaker | Rodgersinstruments.com
I'm not quite following something. Are these plastic cones?
Repairing Rodgers Organ Speakers
In fact the original Rodgers FR 1.7LX picture tells you a lot too, since a reflex is usually sized close to the Vas with a Qts around 0.4.
FR 1.7LX Three-Way Tuned Port Enclosure Speaker | Rodgersinstruments.com
I'm not quite following something. Are these plastic cones?
Hey guys. Thanks for the responses. I recently built a pair of single driver full-range speakers (Buschhorn MKII). I have a lot of leftover birch plywood and I am thinking of building an enclosure with the Peerless drivers that will help fill the low end. I don't want anything that will rattle the cupboards, just something to add a little "umph" at the bottom. I don't have equipment to take measurements (though that will probably change soon) and am just curious about the basics now, such as Fs, Vas, Qts, etc., and how the heck I can get some use out of 'em.
The guy I bought these from said they came from a three way cabinet, but also said some were in an array. I thought organs had pipes so all that left me a little puzzled. 🙂 I've got decent woodworking skills, have six of them, and am open to any suggestions.
System7: They do have plastic/poly cones. Thoughts? These any good?
The guy I bought these from said they came from a three way cabinet, but also said some were in an array. I thought organs had pipes so all that left me a little puzzled. 🙂 I've got decent woodworking skills, have six of them, and am open to any suggestions.
System7: They do have plastic/poly cones. Thoughts? These any good?
Thiele-small parameters are rather obvious once you get the hang of Vas and Qts. Fs tells you how deep they might go ultimately and is related to cone mass and suspension softness.
I've never seen closed box calculations explained more simply than by Morgan Jones here at diyAudio in his Arpeggio design:
http://www.diyaudio.com/forums/diyaudio-com-articles/158899-arpeggio-loudspeaker.html
My guess is those drivers have a Vas of about 2 cubic feet or 60L. They look like Acoustic Suspension drivers at heart, based on the foamed surrounds and presumably low Qts around 0.3 or 0.4. Probably best crossed over to a midrange around 800Hz and 90dB sensitivity, and suitable for 20-30L closed box.
You might end up with something that looks like an Acoustic Research AR-3A (google it...), or this Visaton design in a smaller closed box, but hey, you could go for the bigger reflex too:
Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories
I wouldn't parallel these bass drivers. That would take impedance too low IMO.
I've never seen closed box calculations explained more simply than by Morgan Jones here at diyAudio in his Arpeggio design:
http://www.diyaudio.com/forums/diyaudio-com-articles/158899-arpeggio-loudspeaker.html
My guess is those drivers have a Vas of about 2 cubic feet or 60L. They look like Acoustic Suspension drivers at heart, based on the foamed surrounds and presumably low Qts around 0.3 or 0.4. Probably best crossed over to a midrange around 800Hz and 90dB sensitivity, and suitable for 20-30L closed box.
You might end up with something that looks like an Acoustic Research AR-3A (google it...), or this Visaton design in a smaller closed box, but hey, you could go for the bigger reflex too:
Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories
I wouldn't parallel these bass drivers. That would take impedance too low IMO.
Good deal. Thanks for the bedtime reading, System7. I'd be perfectly happy with something like the AR 3A. I could try do something more exotic like a T-line. I have some Fried Q/2s (which use a crude interpretation of the transmission line theory). They also use an 8" driver and are very impressive...I'll have to get some testing equipment and see what the possibilities are.
Hi,
Wiith 6 drivers presumably 8 ohm your best bet is 3 series pairs in parallel.
Best estimates are 20L sealed per driver and 30L vented to 40Hz.
If you clamshell each pair (isobaric) box volumes drop dramatically,
10L per isobaric pair sealed and 15L per isobaric pair vented.
Max SPL and efficiency drops, but so does box size by a quarter.
rgds, sreten.
Wiith 6 drivers presumably 8 ohm your best bet is 3 series pairs in parallel.
Best estimates are 20L sealed per driver and 30L vented to 40Hz.
If you clamshell each pair (isobaric) box volumes drop dramatically,
10L per isobaric pair sealed and 15L per isobaric pair vented.
Max SPL and efficiency drops, but so does box size by a quarter.
rgds, sreten.
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