Originally Posted by NicksHitachi
Depends on how you define better made. Better design maybe but all drivers have defects, this and that one no different.
That spider ring should never come off if glued down proper during normal to extreme use. However if not glued proper...... the same goes for the spider to basket and surround/cone/basket joints they will come loose if the assembler doesnt get the glue right.
Congrats on the purchase!
Ok, here's how I define it based on the specifications given by PE:
Two common types of subwoofer frames are cast aluminum and stamped steel. If cost were of no concern and I had my choice between them, I'd choose cast aluminum. It is more rigid and provides additional cooling since Al dissipates heat more efficiently than Fe or steel. I am not saying that stamped steel frames aren't good. Of course the best stamped steel frames can undoubtedly be made just as rigid but one would be paying at least as much as if not more for them and still not gain the advantage of better cooling. The stamped steel frame is suggestive of the fact that the manufacturer is cutting costs and passing those on to the consumer as a lower priced alternative. The RSS390HF-4 15" has a cast a aluminum frame.
The Al cone and Al voice coil former of the RSS390HF-4 are desirable features to me also because here again those can help cool the driver through better heat dissipation than paper/kevlar cones and Kapton / Polyimide formers. The voice coil is larger too at 2.5" diameter with a much heavier magnet. But teamed with the better heat dissipation of the Al voice coil former, Al cone, and cast Al frame, it all adds up to greater power handling: 500/1000 vs 350/700 (watts rms/watts max).
The foam surround of the DVC385-88 vs the butyl rubber of the RSS390HF-4 has no disadvantage except for looks. It's just that foam surrounds look cheap to me. I like to leave by speaker grilles off. Butyl rubber surrounds just have a higher end look to them.
Despite the higher end construction of the RSS390HF-4 15", I still would have gone for the DVC385-88 15" just for the lower cost. In a 3.3 cu. ft. cabinet the performance between the two aren't night and day at lower power levels. However, during very loud action scenes having low bass below 30 Hz , I think the RSS390HF-4 15" would out perform it due to better heat dissipation. I don't have any data to back that up though.
The defects in the DVC385-88 15" reported here by a few were the deal breaker for me.