Hi. Difficult to answer your question. I can imagine a number of ways how a bedroom setup is used, and that would probably have a significant impact in what the better approaches might be.
Do you listen from a stationary position, or do you move around? If you move around, read the papers by Dr Earl Geddes about using multiple subs. His main goal is to achieve a flat bass response at different points in the room by using multiple subs. This is very important if you listen while you move around much, or if you have more people listen with you. If one is stationary, then optimizing for one given spot can be done too. Geddes argues for the use of 3 or 4 subs. I've tried with two, worked very well, but lately moved away from the approach because when I listen critically I do so from a single point, stationary.
Expanding the soundfield is usually first optimized by proper speaker placement, and listener placement. I struggle to see how that can be done in a bedroom. Maybe in your case it is, but generally speaking I would suggest to let go.
I'm not familiar with the subs you mention. A sub that goes lower is great, but it must go low in a nice way (low distortion, tight). Larger drivers provide more impact as they move more air. Tough to get around basic physics, despite what marketineers might try to make you think. I have two 12" subs and wished I had gone for the 15" even though my bass is very, very good.
I used to have a Rel Storm III and replaced with two Rythmiks and couldn't be happier. Despite being much cheaper than the Rel, the Rythmik drivers are larger: 2x12" vs. 1x10", so not fully useful for your comparison. I like two subs, though.
BTW, please note you are missusing khz, which means kiloHertz, or 1000 Hertz. So 38 khz means 38,000 Hz, which is not what you meant. 38 Hz is what you meant.
Do you listen from a stationary position, or do you move around? If you move around, read the papers by Dr Earl Geddes about using multiple subs. His main goal is to achieve a flat bass response at different points in the room by using multiple subs. This is very important if you listen while you move around much, or if you have more people listen with you. If one is stationary, then optimizing for one given spot can be done too. Geddes argues for the use of 3 or 4 subs. I've tried with two, worked very well, but lately moved away from the approach because when I listen critically I do so from a single point, stationary.
Expanding the soundfield is usually first optimized by proper speaker placement, and listener placement. I struggle to see how that can be done in a bedroom. Maybe in your case it is, but generally speaking I would suggest to let go.
I'm not familiar with the subs you mention. A sub that goes lower is great, but it must go low in a nice way (low distortion, tight). Larger drivers provide more impact as they move more air. Tough to get around basic physics, despite what marketineers might try to make you think. I have two 12" subs and wished I had gone for the 15" even though my bass is very, very good.
I used to have a Rel Storm III and replaced with two Rythmiks and couldn't be happier. Despite being much cheaper than the Rel, the Rythmik drivers are larger: 2x12" vs. 1x10", so not fully useful for your comparison. I like two subs, though.
BTW, please note you are missusing khz, which means kiloHertz, or 1000 Hertz. So 38 khz means 38,000 Hz, which is not what you meant. 38 Hz is what you meant.