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<blockquote data-quote="zako" data-source="post: 7600139" data-attributes="member: 629735"><p>I can&#039;t comment on SQ but both are supposed to be good. Both are supposed to have very flat symmetric BL curve. The sundown has a flat symmetric le curve, and low distortions (These specs/test results are not available for Type-R as of now). These should sound good in a right box. The Sundown SA-12 subwoofer has pretty low sensitivity in a sealed box, but it has reasonable qtc of around 0.7 in a 0.9cu ft box. I don&#039;t know about its thermal limits, but excursion will no exceed its xmax until it sees about 1000watts. But then again, due to the sensitivity issue, at the point it would be about as loud as Alpine Type-R in a sealed box (1.2 cu ft or so) and seeing only 600watts. If you want to run your amplifier at 4ohms, I&#039;d take the Type-R. If you can wire for 2ohm load, it&#039;s a toss up. I&#039;d take Sundown SA12 D4, because it has lower qtc in a small sealed box, which is valuable in a compact car and wire the amp for 2ohm load. This will probably call for a solid electrical system. At least 4awg power wire running to the distribution blocks, and the big 3 upgrade is recommended. Run it sealed and see how it goes. If you don&#039;t like it, you could always try out ported. If your car has a weak alternator, then stick with amp wired for 4ohms and use the Alpine Type-R in sealed box or Sundown in ported box.</p></blockquote><p></p>

[QUOTE="zako, post: 7600139, member: 629735"] I can't comment on SQ but both are supposed to be good. Both are supposed to have very flat symmetric BL curve. The sundown has a flat symmetric le curve, and low distortions (These specs/test results are not available for Type-R as of now). These should sound good in a right box. The Sundown SA-12 subwoofer has pretty low sensitivity in a sealed box, but it has reasonable qtc of around 0.7 in a 0.9cu ft box. I don't know about its thermal limits, but excursion will no exceed its xmax until it sees about 1000watts. But then again, due to the sensitivity issue, at the point it would be about as loud as Alpine Type-R in a sealed box (1.2 cu ft or so) and seeing only 600watts. If you want to run your amplifier at 4ohms, I'd take the Type-R. If you can wire for 2ohm load, it's a toss up. I'd take Sundown SA12 D4, because it has lower qtc in a small sealed box, which is valuable in a compact car and wire the amp for 2ohm load. This will probably call for a solid electrical system. At least 4awg power wire running to the distribution blocks, and the big 3 upgrade is recommended. Run it sealed and see how it goes. If you don't like it, you could always try out ported. If your car has a weak alternator, then stick with amp wired for 4ohms and use the Alpine Type-R in sealed box or Sundown in ported box. [/QUOTE]

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