1kW MOSFET amplifier

[jleaman]

if yuo want loud bass and lots of it use a servo sub or get 6 15" eclipse subs THERE LOUD hehe

[jleaman]

http://www.partsexpress.com/pe/pshow...number=295-500


dude these have 18mm x-max WAY more then them 18" pos's get some thing worth the money man..

[Kilowatt]

Dude, that's a car sub (car subs won't work, according to AudioFreak, and his explanation sounds reasonable), and it's a 4 ohm. I NEED to use 8 ohm speakers if I'm going to use 4 of them in parallel for each amp. What a shame, because you're right, they do have a lot more Xmax than the Eminences. (but ALUM12X's have 31mm Xmax! They're not a lot more $ either, and more sensitive too.) The ALUM12X's can run 12 ohms, but I can raise the supply voltage to about +/-75V for those, not a big deal. 4 ohm speakers just plain won't work unless I drive a 1 ohm load, but the high current through the OPS would degrage the sonics if I did that. Eclipses are car subs too.

As for servo subs, like the ContraBass and BassTech 7, I might use them, if they're not too pricey. I don't know where to get anything like that though.

[jleaman]

humm then get 8 ohm subs then hehee and yeah i would get the ones for 33xmax because of out doors yuo wont hear it bottem out LOL also the sedrvo drive ones are going to be tricky though.. and for car subs they will work out doors no problem..

j"

[AudioFreak]

Originally posted by JasonL
and for car subs they will work out doors no problem..

Oh, Yes they will work but if you model alot of them they will need huge amounts of EQ to make up for the lack of cabin gain.

[Kilowatt]

they will need huge amounts of EQ to make up for the lack of cabin gain.

Do you mean that outdoors, their frequency response would be full of spikes? How big of spikes? I might be able to compensate with EQ if It's not more than maybe 6dB, but hopefully less. Or couldn't I build enclosures with "cabin gain"?

[AudioFreak]

that and the fact that they will have very decreased bass performance in the form of a higher effective rolloff and a knee in the frequency response ... even with the doors open in a car, there is still a significant amount of loading that will not be present during use outdoors. The effect of this is that if you want to flatten the response, you must use line level EQ and you'll lose quite a bit of efficiency....

[Kilowatt]

What if I built an enclosure the size of an automobile cabin, with a vent going into an exponential horn, and the subs mounted in boxes built into the side of the enclosure, something like this. Would that work well? (Of course the sides of the big enclosure would be made out of lexan so everyone could see the beautiful excursion on those subs! )

[AudioFreak]

Sweet.... would certainly decrease the amount of EQ needed and apart from the fact that you'd have to run the drivers on either side of the enclosure electrically out of phase (actually that's a good thing from distortion point of view) you'd lose 3dB because not all drivers are mounted on the same panel but you'd probably gain more than 6dB from that configuration.... I say Go For It! Now I cant wait to see this in stereo ....

[mrfeedback]

and apart from the fact that you'd have to run the drivers on either side of the enclosure electrically out of phase

Pardon ?.

Eric.