REL t5i + ht1003

Hello everyone:)

I have a pair of REL t5i subs in my 2 channel system. Because of unresolved hum issues with my bridged amplifiers in mono, I have them hooked up via low input. One going into preout in integrated and one in pre out of power amplifier. (Right loudspeaker on integrated and left loudspeaker on power amp). The sub out on the integrated is free. I found a ht1003 for sale online for about half of retail. It's a bit of distance away so can't really try before buy. At the price..I'm tempted to buy it and put it in my system. I'm happy with the way the pair of t5is perform but I do love bass  and i am curious what would things sound like if I throw in Ht1003 with my pair of t5is. I assume I could just use the sub out on the integrated.  I suppose this question is for people familiar with Rels. The t5is blend very well and im Not sure if implementing the ht1003 will throw my Soundstage off and make things sound 2 sloppy. Strictly music listening:)