caydin, on Apr 26 2006, 12:26 PM, said:
15 will almost always be louder, not only because of the obviouse piston area advantage, but because thay are almost always more efficeint, more sound from the same power...
not quite true (well ok, you did qualify it with "almost always"). quality subbass depends on many factors, so a quality 10 or 12" can easily outperform a 15" that is lacking in some area or another:
*cone surface area
*cone excursion (xmax): often overlooked, but very important
*sensitivity (efficiency)
*subbox efficiency and design: ported is far more efficient than sealed
*power handling
*amplifier and tuning
so if you have a high excursion 10 in a ported box (eg: IDMAX10), it should easily outperform a regular 15 (eg: alpine type-R), for all of accuracy, loudness, how low it plays.
you want a good 'combo': amp, sub, box. so i echo the above sentiments that a top quality sub deserves a suitably high quality subamp. but sure, a high quality sub + average amp has a good chance of sounding better than a high quality amp and midspec sub. in general, i suggest spending 1~2x the cost of the sub on the amp; so a $800 sub would be ideal with an amp costing $800~1600. if you can 'only' afford a jaycar monobloc, maybe look at a $200~400 sub.
i like the IDMAX12 for sure; it's what i run now. before that, i ran the diamond audio M612 as already suggested, and yes, this was a great SQ sub (compact box, played loudly and accurately, reasonably low). IDMAX is easily superior, but is not only more expensive, but very big, posing installation probs to some people (in the same mould as many high-excursion subs like boston G5, DD3512, DA TDX, etc).