Thats a tough one and I dont think there is much in it. For the cost of them new it would be the XLS every time. That said, I would probably side with the BK just on rep alone. I beleive the epos els and the M are the same apart from a few extra bobs and whistles, and the els/m are in the rough same ball park as the BK.
Best thing, test em side by side and see what you think. Only risk, he might just decide to take the BK back with him.
Not necessarily, its not uncommon for a ground loop to cause a hum, or if you turn the gain up on the sub so the amp is working harder, this to can cause a hum. Neither are uncommon and neither are related to a sub on its last legs.
Your best asking amongst the owners if you can find any, if there are any issues known that are common ways for Epos subs to die.
As for which sub, I'd go for the cleaner bass every time. The chances are the BK is probably loud enough for you anyway.
The hum is when its on standby - even with the gain turn down.
If this is not uncommon then can probably be dismissed, unless current of previous EPOS M owners can say otherwise.
We will give the two another few rounds of testing tomorrow to decide whether a swap is worth it or not..... The EPOS M does look nice though...... But then again if you add a granite or thick MDF plinth to the XLS200 it will look just as nice (and smaller)...........
After spending most if the day testing and comparing these two id confess to the XLS200 being better (obviously just my opinion - and what sounds good to me).
Tested a number of music tracks (mostly R&B) and movies (ie Transformers, Terminator, Cloverfield, etc) and the XLS200 just seemed to be cleaner. The EPOS M seemed to go slightly deeper but it wasnt as controlled. The XLS200 integration with a set of HC speakers was better where as the EPOS M seemed to go off on its own.
If i was going on looks, the EPOS M looks bloody beautiful. The XLS200 is just a small box (good if your limited for space). The EPOS M looking like the man and the XLS200 being a child.
Id be tempted to go for the XLS200 on sound quality, but has anyone else compared these two - just so i dont give a biassed opinion to a mate who then hates me for sending him down the wrong path...?
I haven gone past 12 oclock,, well actually i did go to the max for a few secs when I first got it and figgering out what all the knobs did, but I didnt notice any humming sounds. I have mine set at 10 oclock atm, and I think thats where its staying
I would try your sub in a diff house and see if its still there, and if its gone, its something todo with you earth in your house. Also try a diff power lead.