Subwoofer for Ayre AX-7e?

p.p.s. I’m enjoying the $1k REL with a $7500 monitor speaker right now. I’m not saying it’s perfect but subwoofer vs better speaker is certainly not an either-or proposition. In fact the point of a good subwoofer is to augment the bottom 2 octaves where it’s very difficult to get proper room loading from 2 speakers positioned for best imaging and tonal balance. If you do get a good sub it should survive an upgrade to the Epos, and even help a speaker that has good bass. And in a room as small as yours, I think a full range speaker could be a bad idea - monitor + sub will likely be a lot easier to tune well.

((And in a room as small as yours, I think a full range speaker could be a bad idea - monitor + sub will likely be a lot easier to tune well.))
Well, easy isn't always best.
The reason I disagree a single sub by the time he hears the bass for what op has paid for can easily overload that room spoiling or confusing what he already has right in the midrange balance, to begin with, it's still a can of worms.
2 properly adjusted small subs work better than one but forward firing drivers tend to draw more attention away chuffing and mooing with artifacts. The Vandy ICIs/Ayre pairing 90 DB effeicient lets bass into the room at 4 points 2 front and 2 back low to the floor transmission line allowing a smoother even in-room response
with its boxless midrange performance.
Best JohnnyR
Audio Connection
Vandersteen/ Ayre dealer

Taww 4-2-2018
... This wiring setup works, HOWEVER, if you turn off the Ayre, you will get a fairly loud hum from the REL. This is because the Ayre outputs are floating and not referenced to ground at all. I haven’t figured out a way to get around this short of modifying the Ayre with a dedicated output for the sub with a muting relay.

A solution might be the suggestion I made earlier:

... An even better approach, IMO, would be to solder the wire from the sub’s negative input terminal(s) to the ground shell of an RCA plug, leaving the center pin unconnected, and inserting that plug into an unused RCA connector on the amp.

That would result in a direct (essentially zero ohm) connection between the circuit grounds of the sub and the amp. While I would expect in the case of an Ayre or other well designed amp connecting to chassis would interpose a significant impedance between the two circuit grounds, resulting in the possibility of hum as I had mentioned. Although whether or not my suggestion would be helpful when the amp is turned off is probably not predictable, since as you alluded to the outputs of the amp are not in a controlled state in that situation.

In any event, thanks for your informative and well written posts.

Regards,
-- Al

@almarg .
My office rig is in a relatively small room (10'x10'), so I don't play music loudly and usually within a small range of volume. In any case, after setting things up the way I liked, I don't find the need to adjust the subs' volume. In fact, I hardly have them outputting, as the Zu's have pretty good bass output by themselves.
B

regret and Ayre
...rare as really deep and flat bass in a 10’ x 10’ box