Quote Originally Posted by bfish View Post
Parallel gap.
Thanks, and I'll add to the 421 discussion, I used the 421-8LF for years, they sounded great. They don't reach as low as a 416, but the midbass they make is so clear sounding, and others opt to paint the aluminum dustcaps, or change them to paper, I've always had good results using EQ with a bit of cut at the offending frequencies, and while maybe this MI woofer isn't exactly what we would call ACCURATE HI FI, I just loved my 421-8LF,s in ALTEC basshorns. With Crown DC-300A,s and a pair of White 4200A EQ,s, and ALTEC horns on top of the cabinets they made some of the MOST REAL SOUND playing pre-recorded music I have ever heard, in my life. I have used 515,s and 416,s in my system, they are all EXCELLENT, but I got a special place in my head for the 421,s!