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Thread: Sub 1500 in 4625 Cabarets

  1. #31
    RIP 2011 Zilch's Avatar
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    Quote Originally Posted by Tom Loizeaux
    Now I'm wondering if I should consider a smaller (3 cu.ft.?) sealed cabinet with an EQ'd plate amp.
    Thanks, Tom. From the number of views, Sub 1500 is a popular subject, for sure, and playing around with them is tons of fun, as you can see.

    Here's what I can tell you from what I've done so far: As Giskard suggests, the Sub 1500 likes the closed box just fine. The bass is clean, tight, and LOW. Due to room rise, you may find you won't need any EQ, even.

    However, be aware that the overall SPL output is as much as 6 dB lower in a closed box, and you'll need a substantial amp to run them at appreciable volume. I see PE has 500 and 1000 W plate amps now, but I have no experience with these.

    I'm running my Sub 1500's on a Mackie 1400i, which is 425 W/C into 4 ohms. Just a rough guess from the LED panel indicators, but it seems I'm actually puting 100 W each into them here. If I added the BX63A, which I plan to do, it's clear I'd need that additional power.

    My target for tuning the box and running ported is 27 Hz, but, since closing the ports, I'm pretty happy with the results, and I may never get around to extending the ports to try it. If I was using these in a disco where I needed more boom per Watt, it might get some project priority here, tho....

  2. #32
    RIP 2011 Zilch's Avatar
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    Different Amps

    Acquired an M552 crossover, so here's what's running the 4625/Sub1500 + 4628B stack now. Note that the 6260 driving the Sub1500's is set to max, and the crossover has them boosted 6 dB as well, while the 6230 is set to half way.

    Sub1500's in closed boxes suck up the power pretty good.

    I KNOW you'll all be impressed with the fine Tuner/CD/Preamp front end of this rig on top there.

    "It's a SONY!"

    [Sounds good tho....]
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  3. #33
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    MTM Stacks:

    Mr. Widget suggested just closing one port to retune the boxes lower. One 4" dia. X 5-1/2" long port on this pair then, approx. 30 Hz tuning.

    Not good on the MACH if I really cranked them, probably, but I like this tuning best, once I got the PHASE right, of course. Sub1500 is positive phase. DUH!

    Those are inverted 4691B's on top there, with 2226H in lieu of E140. Maybe I find a way to squeeze more UHF outta them now....

    2404H above the Sub 1500 there? Naw, that'd be CHEATING!

    Shall I finish the walls or kill the hum first? Could be it's the UFER....
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