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Post by Deleted on May 14, 2015 16:41:47 GMT -5
I still have to recommend against the crown xls amps there are plenty of guys having issues as can be seen in this linkPlus there is no dsp in the crowns or the xpa for that matter so you'll need to get a minidsp or something similar to implement a hpf (rumble or subsonic filter) to keep your sub from bottoming out below tuning in the ported enclosure. Never had any issues with any crown xls' I've owned. Seems like lots of people use them for subs no problem. Strange indeed. Were you ever able to get the fans to fire up in the crown ? I haven't had a chance to actually test this my self, as I'm (tbth) lazy... and don't want to take my rack all apart, again. Using the xls on my 98db efficient Jtr's obviously wasn't a difficult task for the amp. haha. From wht I can tell from reading the couple of threads on it and discussing with a couple of guys is that it's really only an issue if you're chasing the under 20hz content... and well to me if it ain't gonna hold up to EVERYTHING I task it to it's got no place in my room.
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Post by stads77 on May 14, 2015 16:47:27 GMT -5
Yes I have noticed the fans before, not cause they were loud, but just cause I could tell they were on. Your right about super low content. I believe my room is flat to about 18hz with my Dayton and Umik shows a steady drop after that, nothing on the Umik showed anything strange happening but I'm not driving a really hungry sub either, nor playing 16hz tones at 110db.
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Post by Deleted on May 15, 2015 8:59:58 GMT -5
Absolutely nothing wrong with using the xpa1,especially since you already have it. You could look into the ultimax driver, PE has them and they are bundled with a 4cu ft flat pack. (The same as what creimes built) . And they are quite affordable and perform pretty good. I'm a fan of ported enclosures however and suggest either building a slot ported design from avs called the "Marty cube" or grab a Stonehenge flat pack from Diysoundgroup. Both perform very well and should give at least the same performance as any of the psa or hsu offerings. I put one of my ported Ixl's up against an hsu vtf15 and it just demolished it. You could also look into some of the stereo integrity drivers which can be run at 2ohms, the xpa1 would be quite the powerhouse in this configuration. HST18 Driver is your best recommendation? Which coil/ohm configuration will work best for the XPA-1? The web site request a preference... Please specify coil configuration in the notes section when you order. Also order the Knock-Down 4.0 cubic ft" enclosure from parts-express? I located the exceptional Stonehenge as well. Thanks fattykidd The hst will handle oodles of power and sound great in a small sealed enclosure. The ultimax has a lower power and xmax but Will perform better in the ported enclosure. You can also look into the ht18 from stereo integrity it's an "entry level" driver but still performs extremely well. Do you have a budget? If you're going with the si drivers you'll want thE d4 as it'll allow you to wire it as a 2ohm load,it's been stated that the xpa amp is stable at 2ohms so you can definitely give it a shot and if the amp is unhappy it'll just go into protection. This is just my opinion of course,your mileage may vary. Lol Ivor..
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selkec
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SCREW YOU GUYS, IM GOING HOME!!!
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Post by selkec on May 15, 2015 9:22:18 GMT -5
I still stand behind a pro amp for a sub rather than a XPA-1, the cost savings are huge in it's own, I use a single channel on my Berhinger EP4000 which is an A/B amp not class D, I would be hard pressed myself to find a difference between them especially running a sub. In the end it's up to you, myself I would sell the XPA-1 and grab a crown amp and put the savings into buying a bigger better subwoofer driver, that's just me though. Chad I totally agree... I used two ep4000s to run 4 mach 5 ixl 18s
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Post by garym on May 15, 2015 13:24:38 GMT -5
Would the Crown SOUND better than the XPA-1. No. You'd hear no difference. Distortion and departures from flatness are hard to hear in freqs below 80Hz in the first place, unless they're extreme, and any generated by the amp will be lost in those created by the driver itself. Very few subwoofers can produce, say, a 30Hz note with less than 5% THD. An additional 0.1% produced by the amp will not be noticeable.
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Post by creimes on May 15, 2015 20:28:26 GMT -5
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Post by trevordj on May 15, 2015 21:19:33 GMT -5
HST18 Driver is your best recommendation? Which coil/ohm configuration will work best for the XPA-1? The web site request a preference... Please specify coil configuration in the notes section when you order. Also order the Knock-Down 4.0 cubic ft" enclosure from parts-express? I located the exceptional Stonehenge as well. Thanks fattykidd The hst will handle oodles of power and sound great in a small sealed enclosure. The ultimax has a lower power and xmax but Will perform better in the ported enclosure. You can also look into the ht18 from stereo integrity it's an "entry level" driver but still performs extremely well. Do you have a budget? If you're going with the si drivers you'll want thE d4 as it'll allow you to wire it as a 2ohm load,it's been stated that the xpa amp is stable at 2ohms so you can definitely give it a shot and if the amp is unhappy it'll just go into protection. This is just my opinion of course,your mileage may vary. Lol Ivor.. I talked to Nick, the owner of Stereo Integrity, when I purchased my HST18 and he stated the XPA-1 would be insufficient power for the HST18 . This of course depends on listening preferences and box configuration/design his exact words were: "Increase your power level considerably. The HST lineup is not efficient, which is why they play so low in such small enclosures. For the HST-11 I recommend at least the 1500 watts that I rate them for." For the HST woofers, they are offered in dual 1 ohm and dual 2 ohm voice coils. Assuming the XPA-1 is 2 ohm stable you could take a gamble with a dual 1 ohm model (wiring in series to 2 ohm nominal impedance) but, in my experience, I am not a big fan of running subwoofers at 2 ohm. Yes, you can get a little more power out of your amplifier (only sometimes the case) but this is at the expense of higher current, more heat, more stress on your electrical system, and lower efficiency. The XPA-1 is certainly capable of driving many subwoofers, and it would likely drive a ported HST18 just fine but class D pro amplifiers seem to be the way to go for these guys. I agree regarding the Crown XLS series too. They have a 12db/octave rolloff below 20hz. For ported designs tuned at/around 20hz you would likely employ a subsonic filter to protect the driver from unloading below tuning anyway so this may actually be desirable. For sealed or low tuned ported enclosures the XLS amplifiers probably are not the way to go. I actually had purchased Crown amplifiers for my HST subwoofer but returned them because of this. I have since gone with Speakerpower amplifiers. They are almost an order of magnitude more expensive but will definitely get the job done.
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Post by pedrocols on May 16, 2015 0:52:14 GMT -5
The hst will handle oodles of power and sound great in a small sealed enclosure. The ultimax has a lower power and xmax but Will perform better in the ported enclosure. You can also look into the ht18 from stereo integrity it's an "entry level" driver but still performs extremely well. Do you have a budget? If you're going with the si drivers you'll want thE d4 as it'll allow you to wire it as a 2ohm load,it's been stated that the xpa amp is stable at 2ohms so you can definitely give it a shot and if the amp is unhappy it'll just go into protection. This is just my opinion of course,your mileage may vary. Lol Ivor.. I talked to Nick, the owner of Stereo Integrity, when I purchased my HST18 and he stated the XPA-1 would be insufficient power for the HST18 . This of course depends on listening preferences and box configuration/design his exact words were: "Increase your power level considerably. The HST lineup is not efficient, which is why they play so low in such small enclosures. For the HST-11 I recommend at least the 1500 watts that I rate them for." For the HST woofers, they are offered in dual 1 ohm and dual 2 ohm voice coils. Assuming the XPA-1 is 2 ohm stable you could take a gamble with a dual 1 ohm model (wiring in series to 2 ohm nominal impedance) but, in my experience, I am not a big fan of running subwoofers at 2 ohm. Yes, you can get a little more power out of your amplifier (only sometimes the case) but this is at the expense of higher current, more heat, more stress on your electrical system, and lower efficiency. The XPA-1 is certainly capable of driving many subwoofers, and it would likely drive a ported HST18 just fine but class D pro amplifiers seem to be the way to go for these guys. I agree regarding the Crown XLS series too. They have a 12db/octave rolloff below 20hz. For ported designs tuned at/around 20hz you would likely employ a subsonic filter to protect the driver from unloading below tuning anyway so this may actually be desirable. For sealed or low tuned ported enclosures the XLS amplifiers probably are not the way to go. I actually had purchased Crown amplifiers for my HST subwoofer but returned them because of this. I have since gone with Speakerpower amplifiers. They are almost an order of magnitude more expensive but will definitely get the job done. Don't Speakerpower only sell products intended for OEM?
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Post by trevordj on May 17, 2015 2:31:22 GMT -5
Don't Speakerpower only sell products intended for OEM? Nope, they used to be OEM only (svs and seaton are two notable manufacturers who use their product) but they have been selling to end users for a couple years now. The product they sell to us mortals does not have dsp, however. Their products with dsp still are OEM only (apparently they are not user friendly and they do not have the resources to provide the tech support that would be needed to support their dsp). Still really solid amplifiers though: efficient, made in the USA, and put out specified power for substantially more time than similar pro style amplifiers.
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