Had a pair of these for a number of years. Are they any use ? Worth anything ? Are the magnets alnico ? Any information about them really.
On the back of one of the magnets it says :
Custom built
Allen organ
8 ohms 292 0008
67 7243
031
On the back of one of the magnets it says :
Custom built
Allen organ
8 ohms 292 0008
67 7243
031
They appear to be AlNiCo. They may be high efficiency with a light cone and high resonance or they may serve as subs. If no one knows from the description then you might listen to their vocal abilities or measure them to assess their best use. I'd want to know their resonance details and their higher mid frequency acoustic performance.
I have some just like that but with a whizzer also. Will probably not work as a subwoofer but would work well for the slam range or higher. You can expect it to work in the 60-600 hz range well.
You might put it is an open baffle if you have one to compare it against other drivers or speakers with REW. You should be able to guess overall efficiency that way.
Also seen how it works in bout 4 cubic feet sealed enclosure.
Could you get a side picture of the magnet structure? Also curious if that one has a little cover over the bottom of the voice coil or not.
You might put it is an open baffle if you have one to compare it against other drivers or speakers with REW. You should be able to guess overall efficiency that way.
Also seen how it works in bout 4 cubic feet sealed enclosure.
Could you get a side picture of the magnet structure? Also curious if that one has a little cover over the bottom of the voice coil or not.
When I tried them they were less sensitive than Saba green cones which are apparently 94-5dB. Which is why I didn't end up using them in my open baffle project and went with eminence bass drivers instead
Open baffle is a demanding application. Sensitivity affects the amplifier you choose, but excursion is often the big limitation with open baffles.
Allen organ used 18" driver for their subwoofer. At least in the 1980 model 300 I worked on.
Likely response to a thousand hz or more. VAS may be very high, drivers in an organ case have a huge volume for the bass reflex action. Not worth much IMHO.
Allen had a 6" mid they used in the installation I worked on. Had foam drivers, which was one reason the church surplussed it. Mids were rattling. No tweeter, organs stop at 7000 hz. The other problem of the 300 was 2 watts/ch out of 100 w/ch power amps. I re-e-capped the power amp & power supplies, replaced the speakers, and donated it to a church that was using a 1957 Wurlitzer organ with motorboating.
Likely response to a thousand hz or more. VAS may be very high, drivers in an organ case have a huge volume for the bass reflex action. Not worth much IMHO.
Allen had a 6" mid they used in the installation I worked on. Had foam drivers, which was one reason the church surplussed it. Mids were rattling. No tweeter, organs stop at 7000 hz. The other problem of the 300 was 2 watts/ch out of 100 w/ch power amps. I re-e-capped the power amp & power supplies, replaced the speakers, and donated it to a church that was using a 1957 Wurlitzer organ with motorboating.
Integral paper surround, most probably light cone, small (40 mm dia?) and light voice coil, puny AlNiCo slug magnet. I would guess a 60 Hz Fs, Qts of about 1, really high - 300..400+ l Vas. VC height likely equals gap height +1..2 mm per side for maximizing sensitivity (90+ dB/W). On-axis HF extension may be quite high, up to 4-6 kHz.
Probably has some use as instrument/bass speaker in an open-back cabinet in a small cabaret.
Probably has some use as instrument/bass speaker in an open-back cabinet in a small cabaret.
EIA Code is 67
or 677243
67 = Eminence speaker.
is a 6 digit code, believe 72 is year 1972
and 43 is 43 week
so October 1972
could be wrong but 67 is Eminence
regardless
Stiff cone, likely high efficiency.
probably likes large cabinet.
Small voicecoil small dustcap.
15" can beam rather early.
But... would seem designed to have
more high-end to be crossed over high
As assumed likely Fs around 47 to 57 Hz
Probably fine in a typical larger generic live sound 15"
reflex around 100 to 140 liters or 3.8 to 5 cubic feet
We dont know Fs but the generic 55 Hz Fb
for live sound 15" likely acceptable.
Or likewise might have been designed to mount
in very large home console or radio, close to " open back"
Either way likes a large space
or 677243
67 = Eminence speaker.
is a 6 digit code, believe 72 is year 1972
and 43 is 43 week
so October 1972
could be wrong but 67 is Eminence
regardless
Stiff cone, likely high efficiency.
probably likes large cabinet.
Small voicecoil small dustcap.
15" can beam rather early.
But... would seem designed to have
more high-end to be crossed over high
As assumed likely Fs around 47 to 57 Hz
Probably fine in a typical larger generic live sound 15"
reflex around 100 to 140 liters or 3.8 to 5 cubic feet
We dont know Fs but the generic 55 Hz Fb
for live sound 15" likely acceptable.
Or likewise might have been designed to mount
in very large home console or radio, close to " open back"
Either way likes a large space