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(More customer reviews)I got this amp 2 weeks ago to power a JL Audio 12W3-2 in a custom sealed box. Instead of using the crappy terminals that come with a sub box, we hardwired Monster 402 XLN Extreme speaker cable to the woofer and used the Alpine connectors for the amp. I don't like boomy bass and don't listen to rap so I was going for SQ, not SPL, and after burning in the new sub for 40 hours, I started tweaking my system. The sub is rated to 500w so I called JL Audio and the Tech told me this amp is a good match at 600 w into 2 ohms. At first the sub seemed UNDER-powered, listless and lifeless, but with good kick drum quality. It just didn't pound enough. Then I tweaked the system with a professional installer and what a difference that made! He ended up turning the gain all the way to max, and I set the sub output in the JVC KW-XR-810 to plus 6 and use the Alpine RUX-KNOB to control the output. We crossed over the Alpine SPR-17S and SPR-69C's at 85 Hz on the JL XD400/4 amp that powers them. Then we used the parametric EQ in the head unit to augment the midbass (plus 2 db at 100hz-medium band) of the Alpine speakers, set the tweeter crossover to minus 3db, and slightly increased frequencies at 1Khz and 10 Khz, narrow band on the parametric EQ. After some experimentation using the Sheffield Drum Track reference DVD, we dialed in the sub, and the rest of the system with tremendous results. The amp provides PLENTY of real hard kick to the drums, and it sounds so clean and lifelike. I'm a professional drummer and I must say I am amazed at the bass quality. I've heard Morel and JL W7 subs that don't sound as good as what I've got in the trunk of a 2007 Impala!! I should add that I Dynamated the doors and trunk completely and then covered the Dynamat with second skin Damplifier Pro and Luxury Liner Pro. Interconnects are Streetwires 7N's. The sub sounds absolutely fantastic powered by the Alpine amp!! I goes DEEP and LOUD without distortion and sounds like a 1000 watt amp!! Congratulations to Alpine for correcting the noise and heat issues with the first series of PDX amps and for producing a tremendous product in such a small but efficient design. I don't even need a cap with this setup. I am in my 50's and listen to progressive rock from the 70's and 80's and the Seconds Out CD from Genesis has some of the best recorded low bass ever, courtesy of Mike Rutherford's Taurus bass pedals which go down to 18hz. My car literally shakes with the energy from this JL/Alpine combo, yet is not boomy or distorted, just powerful and lifelike. No matter how far I turn up the volume, the sound remains clear, detailed, and undistorted. My friend who has the JL W7-13-3 sub is so impressed, he's ditching his JL 1000/1 amp for A PAIR of PDX-M6's (they're stackable); one amp to power each voice coil of his monster sub. He has an extra battery, gi-normous alternator, 4 farad capacitor, "the big three" with 0 gauge wires, etc. and yet my sub sounds BETTER. This is the best Alpine product I have ever owned.
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