Best sub for music,


Not HT, repeat not the boomboomboom of HT  effects.  which does not offer the high fidelity of musical sub bass (20hz-40hz) 
I'd have to go with the seas W26E001. which has a magnesium/aluminum cone. 
What that raitio is, not sure, seems 50/50. 
None of us here like the sound of those old aluminum cones. But my guess is Seas had to incorporate some alumium inorder to gain the 20-30hz and also mabe keep costs down. 
This YT vid says **Aluminum cone** which is confusing YTers.
Its a  composite, and perhaps the best ture woofer on the market.
Been around for ages, still hard to beat for pure natural low mids. .
Magesium is the best material to keep unwanted resonances out in the  60-1k range, very low/hardly measurable distortion. 
The issue here  tops out at 1k, so its really a  sub. 
This woofer may be a  good candidate to pair with a  5 inch wide band. 



https://www.youtube.com/watch?v=RSiuaMWodzI

http://www.seas.no/index.php?option=com_content&view=article&id=362:e0026-08s-w26fx001&c...
mozartfan
JL Audio makes very serious subwoofers. I would take them over REL. A relative has two Gothams. Wow. 
 https://www.jlaudio.com/collections/home-audio-dominion
I believe that it is better to get speakers that go lower than to add a sub. But, that’s just me. 
jheppe815, Your post had me lamenting over my pair of Marantz 8B powered DIY JBL 4530 scoops I used in a back line stage Bass rig in the mid 60's. 
JBL was so approachable and helpful during that period.
My current back packable Upshot rig weighs just 14 lbs. 
  
That 8B was my roundabout introduction to Hi-Fi. 
multiple subs and how you arrange them, personally I like the way my Martin Logan subs integrate with my various systems 
I have a single REL S5 mated to my Klipsch Cornwall IV speakers.  The Cornwalls don't need much supplementation at the bottom end but I think the S5 integrates perfectly with them.   My S5 is set to roll off at the top end at about 32.5Hz.  All my audiophile friends that have listened to my system complement how well the S5 integrates with the CW IVs.  Signal Cable makes a great Speakon connector subwoofer cable that I use to attach to my power amp's binding posts.