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Post by blindsay on Jul 3, 2014 12:03:45 GMT -5
So for the past 7 months or so i have been running a JL 12W7 on a Behringer EXP2800 pro amp which i havent been that impressed with (but thats a whole different story). But it got me thinking, do you think we might ever see an amp from Emotiva that could handle a 3 ohm sub like the JL W7? Would love to run something like an XPA-1 on it but it only goes down to 4ohm
edit: i have seen a couple threads floating around that seem to indicate that the XPA-1 might be able to handle a 3ohm sub abit unofficially?
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Post by Topend on Jul 3, 2014 12:27:40 GMT -5
Lonnie has posted about this in the past. Someone with a better memory than I might he able to post.
Dave.
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Post by mauriceminor on Jul 3, 2014 13:17:35 GMT -5
Per Lonnie on 10.20.2008
XPA-1 1.35kw @ 3.2 ohm - 110v 1.75kw @ 2 ohm - 220v
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Post by AudioHTIT on Jul 3, 2014 13:25:00 GMT -5
So for the past 7 months or so i have been running a JL 12W7 on a Behringer EXP2800 pro amp which i havent been that impressed with (but thats a whole different story). But it got me thinking, do you think we might ever see an amp from Emotiva that could handle a 3 ohm sub like the JL W7? Would love to run something like an XPA-1 on it but it only goes down to 4ohm edit: i have seen a couple threads floating around that seem to indicate that the XPA-1 might be able to handle a 3ohm sub abit unofficially? I believe the post was something to the affect that the XPA-1 and maybe the XPA-2 would be stable into 2 ohms, but that they didn't want to spec the amp that low lest someone run a pair of very low impedance speakers in parallel, or bridge the amp and use a low impedance speaker. I'd think you'll be fine with an XPA-1, but if you're unsure give them a call (though it will still 'officially' be 4 ohms).
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Post by Dark Ranger on Jul 3, 2014 13:41:59 GMT -5
Saying that the XPA-1 "only goes down to 4 ohm" is not entirely accurate. Lonnie has said the amps will handle 2 ohm dips no problem. He didn't want to specify the 2 ohm rating because some folks would want to run 2 ohm nominal speakers (or lower).
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Post by Porscheguy on Jul 3, 2014 15:17:09 GMT -5
Yep, 2ohm mono bloc amps are at the top of my list. Barely a day goes by when I don't think about them. In fact, I'm thinking about them right now and saying... huh?
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Post by blindsay on Jul 3, 2014 16:39:06 GMT -5
Saying that the XPA-1 "only goes down to 4 ohm" is not entirely accurate. Lonnie has said the amps will handle 2 ohm dips no problem. He didn't want to specify the 2 ohm rating because some folks would want to run 2 ohm nominal speakers (or lower). well the sub I want to run is 3 ohm nominal so its oddly right in the middle
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Post by Gary Cook on Jul 3, 2014 16:42:40 GMT -5
Saying that the XPA-1 "only goes down to 4 ohm" is not entirely accurate. Lonnie has said the amps will handle 2 ohm dips no problem. He didn't want to specify the 2 ohm rating because some folks would want to run 2 ohm nominal speakers (or lower). well the sub I want to run is 3 ohm nominal so its oddly right in the middle My view, go for it, if it doesn't like it the XPA-1 will protect itself. Cheers Gary
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Post by Dark Ranger on Jul 4, 2014 0:55:38 GMT -5
I would be interested in seeing the impedance bode plot for that woofer. You might be OK, but it sounds like the average load is less than traditional speakers. The plot would also show maxima and minima across the frequency spectrum.
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Post by blindsay on Jul 7, 2014 7:25:33 GMT -5
Would my UPA-1 be as likely to handle the ohm rating as the XPA-1? I just ask because i dont own a XPA-1 but i could test it on my UPA-1
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Post by pedrocols on Jul 7, 2014 7:49:23 GMT -5
Would my UPA-1 be as likely to handle the ohm rating as the XPA-1? I just ask because i dont own a XPA-1 but i could test it on my UPA-1 If you have the ability to do that just go for it.
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bootman
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Post by bootman on Jul 7, 2014 9:17:26 GMT -5
The XPA-1 will have no trouble with a 3ohm load. Your breakers might so i would run the amp at 240V if you are going to so that. But the XPA-1 would not be my first choice for a sub amp. Lots of more efficient designs out there for that kind of work. Leave the XPA-1 to drive full range low impedance panels. That is its real purpose.
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Post by blindsay on Jul 7, 2014 9:24:27 GMT -5
The XPA-1 will have no trouble with a 3ohm load. Your breakers might so i would run the amp at 240V if you are going to so that. But the XPA-1 would not be my first choice for a sub amp. Lots of more efficient designs out there for that kind of work. Leave the XPA-1 to drive full range low impedance panels. That is its real purpose. Im open to suggestions, i just liked it because A: i like my equipment to match (not a requirement by any means but its a nice to have) but more importantly the fan noise of my current Behringer amp drives me crazy. Ill try the UPA-1 just as a test to see how that goes and go from there. More of a general question, but whats my biggest concern when running a speaker on an amp with lower that reccommend resistance? over heating?
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bootman
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Post by bootman on Jul 7, 2014 11:08:53 GMT -5
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KeithL
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Post by KeithL on Jul 7, 2014 11:16:24 GMT -5
I think you'd be pushing things to run a UPA into 2 ohms (I don't think you'll break anything, but I would watch out for overheating). Would my UPA-1 be as likely to handle the ohm rating as the XPA-1? I just ask because i dont own a XPA-1 but i could test it on my UPA-1
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KeithL
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Post by KeithL on Jul 7, 2014 11:21:27 GMT -5
I agree - but perhaps more emphatically. A subwoofer amp is designed to deliver lots of power into very low impedance loads; it also doesn't have to handle full range signals, and its full-audio-band S/N isn't terribly important (because a sub won't be reproducing 10 kHz hiss anyway). In short, you can almost certainly buy a subwoofer amp that will put out more power into very low impedance loads, and will sound every bit as good as an XPA-1 for running a sub, for far less money. (I would suggest a nice, cheap, cool running Class D panel amp... ) The XPA-1 will have no trouble with a 3ohm load. Your breakers might so i would run the amp at 240V if you are going to so that. But the XPA-1 would not be my first choice for a sub amp. Lots of more efficient designs out there for that kind of work. Leave the XPA-1 to drive full range low impedance panels. That is its real purpose.
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Post by wizardofoz on Jul 7, 2014 14:13:27 GMT -5
Personally I have run down in the 2ohm mark on xpa-1’s with 2 x 4ohm nominal seas 10" woofers in parallel on my linkwitz LX521's but the meters are calibrated at 8 ohms 500w output so into 2ohms a 25% meter burst is full output into 2 ohms...something that did happen from time to time. I'm fortunate to be in a country that is standard ac power at 240 and 20a wiring, but with 13a sockets
I ran this config for a month or so, until I got another pair off xpa-1's and had 4 upa-1's for the mids and tweeters. But it was just taking up too much room and I downsized to 2 x xpa-5g2's
I cant honestly say that I heard any difference other than needing to boost the pre a bit as the g2's are 29db gain versus the older xpa/upa's 32db.
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Post by redog on Jul 7, 2014 14:54:14 GMT -5
So for the past 7 months or so i have been running a JL 12W7 on a Behringer EXP2800 pro amp which i havent been that impressed with (but thats a whole different story). But it got me thinking, do you think we might ever see an amp from Emotiva that could handle a 3 ohm sub like the JL W7? Would love to run something like an XPA-1 on it but it only goes down to 4ohm edit: i have seen a couple threads floating around that seem to indicate that the XPA-1 might be able to handle a 3ohm sub abit unofficially? Crown xls 2500 for 500.00 would be the sweet spot.
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Post by blindsay on Jul 7, 2014 17:06:05 GMT -5
So for the past 7 months or so i have been running a JL 12W7 on a Behringer EXP2800 pro amp which i havent been that impressed with (but thats a whole different story). But it got me thinking, do you think we might ever see an amp from Emotiva that could handle a 3 ohm sub like the JL W7? Would love to run something like an XPA-1 on it but it only goes down to 4ohm edit: i have seen a couple threads floating around that seem to indicate that the XPA-1 might be able to handle a 3ohm sub abit unofficially? Crown xls 2500 for 500.00 would be the sweet spot. is it going to loud like my Behringer though, I really want a silent amp, and as with my current amp I would be wasting the second channel.
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