Yes, I see what you mean about the magnet size. One thing that shocked me was the last link of the 15W’s, the WK & BWK’s models say 3.2 ohms dc for a 16 ohm impedance. Maybe a misprint or I just learned something new. Not seen any 16 ohm speakers to read below 5.6 ohms or so dc in my 40+ years...?
Electrovoice 18" Woofer: smallish Magnet; only 2.3 ohms?
I’ve been watching some electro-voice drivers, from their Vintage Model E-V Six, drawn by the 18" woofers,
original specs say 8 ohms
https://products.electrovoice.com/binary/E-V%20Six%20EDS.pdf
here’s a pair of the woofers
https://www.ebay.com/itm/254646609730?hash=item3b4a1ee742:g:y-gAAOSwk19fBH44
1. 2.4 OHMS? My vintage drivers, Crossover, and L-Pads from that era are nominal 16 ohms. I never measured them.
2. Smallish Magnet on 18"? My 15" paper woofers, 15W 37 lbs, have much bigger magnets. (the 18" are 1/2" thick styrofoam).
https://products.electrovoice.com/binary/15W,%2015BW,%2015WK,%2015BWK%20EDS.pdf
https://www.ebay.com/itm/284098370766?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=533...
3. Mine is 16 ohms, I know they make a 8 ohm version, yet that one shows 3.5 ohms???
Help me avoid trouble by ignorance please,
thanks, Elliott
original specs say 8 ohms
https://products.electrovoice.com/binary/E-V%20Six%20EDS.pdf
here’s a pair of the woofers
https://www.ebay.com/itm/254646609730?hash=item3b4a1ee742:g:y-gAAOSwk19fBH44
1. 2.4 OHMS? My vintage drivers, Crossover, and L-Pads from that era are nominal 16 ohms. I never measured them.
2. Smallish Magnet on 18"? My 15" paper woofers, 15W 37 lbs, have much bigger magnets. (the 18" are 1/2" thick styrofoam).
https://products.electrovoice.com/binary/15W,%2015BW,%2015WK,%2015BWK%20EDS.pdf
https://www.ebay.com/itm/284098370766?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=533...
3. Mine is 16 ohms, I know they make a 8 ohm version, yet that one shows 3.5 ohms???
Help me avoid trouble by ignorance please,
thanks, Elliott
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- 30 posts total
Electro-voice made their 15" and 18", W Series woofers in two versions. The WK types were specifically designed for use in corner-horn (K-type) enclosures, with a restricted enclosure volume and a horn-loaded output. Though they were both rated as 16 Ohm nominal: the K types spec at 3.2, as opposed to the W's 11.6, with DC. The W types were designed for infinite baffle enclosures. There were also 15BW and 15BWK versions, that had a smaller voice-coil (2") and lighter magnet structure, than the W and WKs (2.5" VC). |
That would be resistance not impedance. Efficiency was a major factor back then because amplifiers were not that powerful. If you are stuck on flea watt amps these old drivers are great it they are in decent shape which is unlikely. Most of them will require remanufacture at some level. I can understand collecting old cars they are art but not old audio equipment. Modern material science has improved drivers particularly suspensions. There are many modern High efficiency woofers available up to 32"! https://ds18.com/products/tm-sn32-32-troublemake-subwoofer?currency=USD&variant=13961390850109&a... |
rodman99999 thanks for the clarifications. Now I see the spec sheets have a separate DC resistance line, thus the 15W link I posted must be a 15WK. The 18" drivers I found, the foam ones in the Model EV-Six are NOT 18W or 18WK 18W and 18WK are bigger versions of my 15W (or 15WK), with monster magnets as you would expect https://www.manualslib.com/manual/43604/Electro-Voice-18w.html the Model EV-Six has 1/2" thick foam cones, the smaller magnets. I don't know what their impedance was, or, if the DC resistance of 2.4 ohms is 'good/normal' or problematic. ??? Anyone know the specs of the 18" 1/2" thick cone driver??? |
- 30 posts total