Dual subs and room size


Hi. I've been considering dual subs with speaker input to pair with my Martin Logan 35xt's and not sure what I should be considering in relation to room size. My room is 17' X 10' with the equip along the long wall. I've been looking at SVS sb1000s and HSU vtf 1/3. The SVS are 12" sealed vs 10" ported hybrid for the HSU. It was suggested that I go with no more than 10".  They will support 100% music. The speakers are pretty much an 9' equidistant triangle set up and would be looking to set the subs on the outer side of the standmounts. Any thoughts or advice would be greatly appreciated. Thanks, Dave

italian
Again I want to thank you for your advice and guidance, I have been following your leads. Last night I spent some time moving and adjusting my current ML orig model Dynamo sub. Wow what difference. Will continue to lock it and conduct measurements. Will be ordering one sub with a thought to two after I lock that one in. Very interesting process. Dave
The subs should disapear when set up right ( 2 will be easier imo),Although there are times i put in something like a reggae cd and it's bass heavy ,then your like "dam those subs are thumpin " .I usually back off the volume on them slightly.otherwise i rarely touch anything other then the volume on them occasionally..And room treatment is the ticket i use gik as many others