Can anyone recommend a good sub to reinforce the bass from the OTO. Speakers are Devore Gibbon 88’s and room is about 16 x 12 feet.
Have a budget of up to £1000 but obviously cheaper is better 
BK xls400 forward firing are the bang for buck choice.
The BK Electronics subs are very good, and excellent value. You can get two for that amount.
This is what I have. BK XLS400FF
They normally have them on ebay, for a fair bit less, but none at the moment. I bet if you contact them direct by phone, you can still get a deal.
Or, you can go for any of the other sizes.
This is the next step down.
BK XXLS400 down firing (for cat reasons) here…
For music, Miller & Kreisel MK350, if you have the room. I use one in my bedroom system. BK also a good shout, but the M&K is just better. Velodyne are also great, I use a DD15 in my main system, but that will be over budget, maybe a DD10 would be good, as they have the room adjustment softare in them.
I would be careful with a sub with the OTO as it’s not expecting to do 20Hz and may be a little soft.
Cheers all have just ordered the BK XXLS400FF.
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Bk make good subs, I have 2 of them in my hifi.
Consider DSPing it into your system along with your main speakers. The whole thing clicked into place when I rolled off the low base from my main speakers to integrate them with the subs. The sub’s controls alone weren’t enough.
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