If you decide to go with a subwoofer setup, and decide to run a separate amp for the sub, is there any rule of thumb for the power of that amp relative to the amp running the mains? I was wondering if there is a percentage split kind of go-by?
thanks
Fred
2X
6230 Mains
6260 Subs
Whether by dumb luck or clever planning, the JBL Performance Series PS1400s come with 400W amps that seem to be well-balanced with the 200W/ch that I'm putting into the Performance Series mains, center, and surrounds. So I agree.
Out.
Depends on a couple of things. Since you are asking about power in I assume you are building them and using an active crossover. You could also use a plate amp however the slopes may not be steep enough. There is no clear cut power ratio. It is driver and tuning dependent. I would go by the rated power the driver can handle and see in box software what the displacement curve looks like with max power PE. Use this to tailor your amp size. Also consider the effect of where your crossover is. Here's why. I run LE14A's which have a limited x-max compared to more modern woofers. There peak displacement is around 50Hz in the tuning I use them in. I cross them other a 50hz using 24dB L/R slopes so they are 6dB down or 1/4 of PE at crossover where the peak displacement is. They run out of displacement at around 25Hz but I have very aggressive high pass filtering around 20Hz with multiple cascaded filters. Because of the filters and crossover point, over the narrow range they run I have never ran them into audible trouble in my size room. So the bottom line is don't go nut's power wise unless the driver you are using can absorb it without damage in the box you are using.
Rob
Next question is, I have 250ti and I am hunting a good sub, then to find some amps to drive them. I have a Mac 2100 with 105 per side, but I am not stuck with that. I was going to get a 350/channel amp with just the 250ti to see how it sounded.
I also have some 4425's and my question really applies to them.
How much room do you have??? You could look into the sub that JBL uses under the 6332
http://www.jblpro.com/LSR/PDF/JBL.LSR6312SP.pdf
or build your own. Use a 2235 or a pair for stereo but you need room for the boxes.
Rob
I've also the 250ti, and have the Plan to build 2 Subs in 8cu with 2245hOriginally Posted by FredEmmerich
this Year.
The Amp for them is Crown K1 with 350/ch.
I would suggest the B460 Sub with a quality amp with ample power to drive it. I have L220 mains and B460 sub and it's a great combination. The B460 was developed in part to compliment the L250, the 250ti's predecessor. (see the JBL library, there you will find a brochure that describes the L250 and the B460 in the same brochure. Also there you will find a brochure that describes the B460 and B380 subs. The B460 utilizes the 2245H 18-inch Low frequency driver, in an 8 cubic foot vented enclosure. It produces extremely deep, powerful bass.
I see you are also a MAC fan. I drive my L220's with a McIntosh MC300, and last year I upgraded my sub amp to a McIntosh MC252, running in bridged 500 watt mode, to drive the B460. You will also need the JBL BX63 dividing network that was developed for the B460. You can also use the later BX63A version that includes variable crossover frequency. The standard BX63 begins its rolloff to the sub at 63HZ. In addition, the BX63 has the capability to bridge the inputs of a 2 channel power amp to run the B460. Before I upgraded to the McIntosh MC252, I used this method to run the B460 with a Hafler DH-500 Amplifier.
If you run the B460 with a quality amp with ample power, together with the 250ti's, you will have a stellar combination!
Best regards,
Peter
B460?
http://audioheritage.org/vbulletin/a...achmentid=3521
....I do have to admit I sort of read "over" the last sentence without paying too much attention to it, I read it as if your question applied "also" to the 4425's instead of "really applies" to the 4425's. After all, the first paragraph sort of reads as if you were looking for a sub to complement the 250ti's. That said, I do have to agree with Zilch that the B460 is an awful lot of sub for the 4425's, and perhaps the B380 may be the more logical choice.
You have pointed out that the B460 (and the B380 for that matter) are hard to come by these days. I know the feeling-I wanted a B460 for years and years and it wasn't until about 6 months after I started eBaying that I finally found one on eBay. The 380 and the 460 do turn up from time to time on there. They are both great subs and worth the wait if you can find one. I've always been glad that I stuck it out and waited for the sub I really wanted instead of compromising for the sake of having a sub in my system "today".
Good luck in your mission!
Peter
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