I picked up a pair of Electro Voice SP 15's

[cradeldorf]

I contacted EV and they gave me a guys name and number but what I am wondering is can these be reconed for subwoofer use? and does anybody know of a cone kit I could buy that would do this or should I go the long expensive route and ship them to be reconed?

[GM]

'Sub' woofer? I doubt it, but it's a good woofer as is. EV used it as one in multi-way systems, so even if blown, it seems best to re-cone it as original if still possible to maintain its collector value.

GM

[cradeldorf]

Originally Posted by GM

'Sub' woofer? I doubt it, but it's a good woofer as is. EV used it as one in multi-way systems, so even if blown, it seems best to re-cone it as original if still possible to maintain its collector value.

GM

Thanks Greg. I wasn't aware that there were EV collectors. I read some stuff about them on the net that was positive but It said a proper cab was like 20 CuFt. I don't have room for that anymore.

[cradeldorf]

I think I'll probably just put them up for sale somewhere.

[freddi]

if they are the 1960's ferrite magnet model with a level control (but not tweeter) then they have low fs (~23Hz), low qts and beautiful tone (better than some modern 8" and 10") I've run SP15 in RJ and Karlsons. The later SP15A were more like EV 15L and gave up a bit of beauty imo in the mids. My pair of SP15A have a two ohm resistor hidden under a frame spoke to raise qes and qts and used something close to a 4ohm voice coil.

if they need reconing then try to find something close to their original cone and coil assembly.

McKenzie carries an EV-clone kit for 15L but I don't know if it would properly fit plus the original whizzered SP15 had a better tone.
I could stand to have two SP15A reconed - Parts Express "Wizard" lists SP15A. I've got way too many speakers as is.

SP15 in the little RJ - it had power when playing a Stanley Clarke upright bass solo. In a Karlson, SP15 has a beautiful midrange and bass much like an Altec 416

mid-60's SP15


~70's-> SP15A

[cradeldorf]

Thank's Freddi, Yep they're those you have pictured in the middle with the big white magnet covers and that L-pad adjustable knob thingy . Mine have just a little 1/4 tear in one of the cloth surrounds the other cone is fine but the surround isn't setting perfectly flat, it's got some wave in it. other than that they look great. Here they are sitting on my kitchen cupboard.

[GM]

Originally Posted by cradeldorf

Thanks Greg........ It said a proper cab was like 20 CuFt.

You’re welcome!

That would be true for a BLH and/or driven with a high output impedance, but with SS or even a small amount of series resistance it’s not so large, especially if you can go tall in a MLTL.

A T/S max flat alignment is ~13.7 ft^3/36 Hz and a typical room ‘friendly’ alignment that typically works well backed up against a wall would be ~6.9 ft^3/36 Hz. For corner loading, ~4.5 ft^3/34 Hz cab should be adequate.

GM

[cradeldorf]

Originally Posted by GM

You’re welcome!

That would be true for a BLH and/or driven with a high output impedance, but with SS or even a small amount of series resistance it’s not so large, especially if you can go tall in a MLTL.

A T/S max flat alignment is ~13.7 ft^3/36 Hz and a typical room ‘friendly’ alignment that typically works well backed up against a wall would be ~6.9 ft^3/36 Hz. For corner loading, ~4.5 ft^3/34 Hz cab should be adequate.

GM

Dang your good. Thanks again buddy, I really need your help on those 604 cabs to finish them up. a better port size recommendation and some stuffing/ wall treatment suggestions would be very much appreciated.

[stereohifi]

Hello, i did an open baffle with my SP15. I did bypass the resonant circuit inside for raising the HF response-i did not need it im adding a tweeter anyway-
sound wise it is surprisingly great. Midrange is so live and OB makes them have great sound.
Extreme LF of course is not there, but todays subs are plenty available to add if you want it.

[freddi]

bet that's good on vocals - SP15 has excellent midrange - were the values of the HF circuit marked? I'd like to see the circuit. What's your helper tweeter in the pix?