May work for someones special project.
Link
Overview
PRV Audio's 18" 18SW2200-2+2 subwoofer performs at many levels above its price point. 9 mm of Xmax, a 4" diameter voice coil, dual spider, and cotton M-Roll suspension all combine to form a subwoofer that remains linear at power levels up to 1,100 watts RMS! The class leading 105 dB sensitivity (2.83V/1m) offers the performance of up to four 18" subwoofers in a single driver package.
Link
Overview
PRV Audio's 18" 18SW2200-2+2 subwoofer performs at many levels above its price point. 9 mm of Xmax, a 4" diameter voice coil, dual spider, and cotton M-Roll suspension all combine to form a subwoofer that remains linear at power levels up to 1,100 watts RMS! The class leading 105 dB sensitivity (2.83V/1m) offers the performance of up to four 18" subwoofers in a single driver package.
The ad copy is a bit insulting but this is the first non-proprietary 1ohm PA 18" driver I have seen and the price is right.
the specs seem a little wonky (SD in the 1400s? really?)
I've actually been trying to diagnose and fix a jbl prx518s (which uses the 1 ohm 2044e driver). I recently reconed the driver as it had a melted voice coil, and now its acting out *sometimes* again.... but I suspect its an amp issue. If I had suspected it a driver issue, I'd be tempted to drop this in that box (not quite as sensitive, but goes muchhhhhh lower in that particular enclosure).
I've actually been trying to diagnose and fix a jbl prx518s (which uses the 1 ohm 2044e driver). I recently reconed the driver as it had a melted voice coil, and now its acting out *sometimes* again.... but I suspect its an amp issue. If I had suspected it a driver issue, I'd be tempted to drop this in that box (not quite as sensitive, but goes muchhhhhh lower in that particular enclosure).
Also from ad:
Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
I live in California and we are used to seeing these warnings all the time because of "special regulations" imposed by our state government to make sure we are all informed about risks, etc. Not worried one little bit.
Anyway, did you notice that the Qts is a wee bit low? This is the "trick" for high SPL drivers - they are overdamped. This is fine for a 10" that will be used as a midrange, but for a subwoofer this means that the bass will be rolling off in a large box, or require a higher than usual tuning frequency to remain flat in a smaller box. So if you are looking at this for a home subwoofer I would check it out using a box modeler first before buying to make sure it will perform as low as you would like.
Also, 9mm Xmax is not all that much. You can get a Dayton UM18-22 with twice that much for about the same price I think but with vastly different SPL (much lower) and Qts (higher) values that are more suitable for home use as a subwoofer.
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Yeah, specs are a bit of a mess since this is really a nominally 6 ohm driver with series VCs, so I calculated Sd……..
GM
edit: missed that the specs were with parallel VCs
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I was thinking this may be a budget option to the JBL drivers...or for a PA sub running off of (car) amps. Nice to have all the options on the table and PRV has some quality products.
I'd be interested in hearing any first hand experience with PRV drivers. Have you (or anyone else reading this thread) used PRV in the past and if so what did you think of build quality, how close were the measured TS specs to the ones the manufacturer provided, etc. Any thoughts are appreciated.
2.83v into 2ohms or a dual 4ohm load is 4 watts so to compare this directly to an 8ohm driver you need to subtract 6dB from the FR graph which means it really only does 97-98db from 100hz down.
yeah 1210 seems like a more realistic sd. mms would be much higher if it was really 14xx something (and thus fs much lower)
For a 1 ohm (2x2 ohm) you need to subtract NINE dB. That puts it at about a 95-96 dB/W driver like all the rest of them. The 1,2 or 4 ohm wiring options may be useful for some, but other than that it's like other similar drivers. It's on the lowish-Qts side, but that's not unusual.
That's not too much of an issue when driven under power though. Unless the BL curve is ruler flat, which I doubt is the case, Qts will be higher as soon as the coil starts swinging in and out of the magnetic gap. The more excursion, the higher Qts rises due to Qes itself rising. It would not be a surprise for me to see Qes double as the coil is nearing Xmax under substantial wattage.
Yeah, ages ago on a HT forum someone had built a then very low, powerful sub system array and decided that if 'x' power was getting him 'y' peak SPL in a 2 m ground plane measurement that doubling the power to match the speaker's 'music power' rating would add 3 dB, but I claimed that it wouldn't play as loud as it currently did due to thermal power compression, which was met with a bunch 'tongue clucking' and a general questioning of my technical knowledge.
To the sub owner's credit though, he posted the new 2x peak power measurements, which showed that the system was fully 6 dB down from the original measurement!
Due to material, manufacturing improvements since the late '90s, I imagine the losses wouldn't be as great, but designing a system that keeps the VC heated up due to high power/lowered efficiency must be factored into the design to reliably meet the app's performance goals.
GM
To the sub owner's credit though, he posted the new 2x peak power measurements, which showed that the system was fully 6 dB down from the original measurement!
Due to material, manufacturing improvements since the late '90s, I imagine the losses wouldn't be as great, but designing a system that keeps the VC
GM
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