SVS vs REL and experiences with both: your comments and preferences...

@tyray, the problem is that the Euro dollar is awefull then the exchange if your Canadian which contributes to people not deciding on Rel. Understandable. But if one is willing, a Rel is the sub to have....IMO.....

I have had a number of SVS subs in the past...  I started with the Ultra16, their flagship sub at the time, it died within a few hours of use on the day it arrived.  The amp went.  It was replaced with another one, it died within a week, the speaker coil fried.    My impressions of it while they were working was that it lacked detail, it was not musical at all, very boomy.
I later got two or three different cylinder subs from them, the basic one up to their top line Ultra versions.   3 of the 4 subs I used (over a few months time) died; one set on fire internally and filled the room with acrid smoke of burnt electronics.  That was enough of that, I got my money refunded (they do have very good customer service) and I moved on to Axiom Audio subs and I got one Bryston Model T sub.  Granted the Bryston is expensive, way more than the top line SVS, it was around $5500; but holy moly what a difference in build quality and performance.  The Axiom subs are super nice too, in fact they build Bryston speakers.   All of the newer subs from these guys are bulletproof and extremely musical, smooth, articulate and detailed.   It's real bass.   Plus all of the drivers and amps are built in Canada, no Chinese import stuff here and it shows.
That is my experience in the sub world.

I understand your grief when it came to your subs amplifiers dyeing on you  My svs did the same just after the warranty ended. Replaced it with newer amplifier and really wasn’t impressed after that. Sold it shortly after...

Guys don't forget JTR and rhythmik servo subs. Both seem quality.

I replaced my JL Audio E-112 (2), with a pair of REL  S/510, due integration  issues. I was running my speakers full range with the subs working underneath, altho the subs sounded very good on some material I just could not eliminate some bass boom and hum. At times I thought it just might be the individual tracks. So I decided to get the REL.s, and the integration, for me, is much better, after getting the subs setup, I no longer have bass issues.