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Re: New replacement DIY sub?
First of all, the RMS rating of a driver doesn't mean you need to provide it that much power. That's the voice coil's thermal limit and typically, your input power will be excursion limited before you reach the thermal limit. Your Shiva being an example...thermal limit is something like 600 watts for both coils in parallel/series, but you've managed to bottom it with a 300 watt amp. You might want to do a bit of reading on what the T/S parameters mean without looking exclusively at Xmax and Fs in isolation to the rest. Then download WinISD and plug-n-chug the various driver options available until you find one you like.
That said. What's your budget? The Parts Express DVC12 is a drop in replacement for the Shiva. The DVC15 is similarly a near clone of the Tempest.
In 8 ft^3 @ 15hz with 300 watts, output is virtually identical for the DVC15 and Titanic15. However, the DVC15 is a hair over it's rated Xmax and a just a hair under the Dumax measured Xmax. Shouldn't be a problem if your Shiva's lived with your listenting habits this long. The Titanic still has about 3mm left before hitting Dumax measured Xmax.
Stepping up to the next level, IMO, would be the Creative Sound SDX-15 at $300ish. Output with 300 watts is virtually identical to the DVC15 or T15, but it's loafing along using only half of its rated Xmax which will get you lower distortion due to less stress on the driver. Somewhere down the road, you can upgrade your amp if you need more output.
There are other options as well, FiCarAudio, AE Speaker (Stryke is reopening soon), SoundSplinter, Ascendant Audio, Mach5 Audio, and maybe TC Sounds.
-Brent
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