bass speakers.

[frosty55]

Howdy chaps. Can anyone recommend a 4 ohm 15 in. driver for use in a p.a. bin? The amp to power it is a BEHRINGER EP2500. (8 ohms per channel-450 watts and 4 ohms per channel-650 watts.) We just want a single one by fifteen bin each side of the p.a. to use in small pubs, with just bass guitar and kick drum going through them. Any advice appreciated.

[jrfrond]

Your problem is that there are not a whole lot of 15"/4 ohm drivers readily-available. If I were you, I would run the amp in bridge-mono mode and just use the 8 ohm speakers that are already in the cabinets.

[Steve Conner]

My local speaker dealer seems to have the Celestion Truvox 1525e in 8 or 4 ohm. But bear in mind that there's not many single 15"s out there that can handle 650 watts, even Behringer watts! You might be better just getting 8 ohm drivers like the Truvox 1530, and making do with 450w per channel, which is still quite a lot of bass.

Running bridged mono with two 8 ohm bins in parallel would need the amp to be rated for 4 ohms bridged, which is the same as 2 ohms per channel stereo. Behringer say it can do that, so now you're cranking 1200 watts into each speaker. Time to get some heavier duty cones like the Celestion FTR15, and nail down any loose objects in the pub

http://www.loudspeaker.co.uk/
http://www.loudspeaker.co.uk/ftr15.htm

[jrfrond]

Steve, that is why I recommended the bridge-mono setup. There are PLENTY of high-power 15"/8 ohm driver out there that can handle upwards of 600-1000W. The Celestion is a decent driver, but to tell you the truth, we've seen a lot of those turn to toast here. They are used in a few subs, one of them being QSC.

Very often, when I need a 4 ohm 15", I'll just take a stripped speaker frame out of my stock and install a new cone kit with a 4 ohm VC. This way, I can build the speaker from scratch for the application, using the VC, cone and spider of my choice.

[frosty55]

thanks for the info chaps.

[David Schwab]

Howdy chaps. Can anyone recommend a 4 ohm 15 in. driver for use in a p.a. bin? The amp to power it is a BEHRINGER EP2500. (8 ohms per channel-450 watts and 4 ohms per channel-650 watts.) We just want a single one by fifteen bin each side of the p.a. to use in small pubs, with just bass guitar and kick drum going through them. Any advice appreciated.

Carvin PS15-4 $79.99

15" woofer features improved high power performance for bass guitar and pro sound applications. Rear-vented. 400W @ 4 ohms. 10 lb magnet structure.

Frequency Response: 38 - 3.5k

Or Carvin PSC15-4 $99.99

Our heaviest 15" cast frame woofer features a 3" voice coil for improved high power performance for bass guitar & pro sound applications. 600W @ 4 ohms. Rear-vented. 38-3k 13 lb. magnet

[Rob Mercure]

Frosty,

When you're shopping for the speakers be aware of the differing efficiencies - if you are used to the relative loudness of guitar amps with their usual efficient speakers you might be dissapointed at the sound pressure level that one 15" radiator puts out. Remember that one of the most effective ways to be "louder" is to double the amount of radiating surface - so depending on an in efficient 15" speaker may leave you with less ability for the audience to hear you than you want (unless you're in one of the "mumble and muffle" bands and then you might try a trumpet megaphone <grin>).

Rob