I can recommend the SVS. You can buy and try for 45 days and return them for a full refund if you’re not satisfied. Their customer service is excellent. You can get on the phone with someone that will walk you through your setup and answer questions. The app is very easy to use. They do not come in walnut though so that may be a deal breaker. I also have experience with RSL and they are a good deal but no app unfortunately.
Sub suggestions please
I just got a pair of JBL L100 Classics (I have seen that they are controversial here, but I love the look, and am impressed with the sound...I'm a happy camper). They are connected to the Cambridge CXA61, and I run a Technics SL1600 with a Grado Prestige Green3 cart, and a Cambridge Alva Duo preamp, and Cambridge CD transport (CXC V2). My sub is a Klipsch Reference Series 12", which I like, but it doesn't aesthetically work with the JBLs. I'm considering the REL Classic 98, Sonus Faber Gravis II, or the SVS SB-3000 (I was told I could get it in a walnut veneer, but haven't actually seen that. Walnut is important in this case). Any seconds on one of those options? Any alternates I should consider at $1,500 or less (I am perfectly satisfied with pre-owned)?