Originally Posted by tvuong
@Marc Alexander;, your upstairs theater is > 3000ft^3 right? Just curious why you think sealed subs are best there. I guess you are going to find out from experimenting with all of the subs you have for the GTG. Looking forward to see a report from you.
It is ~3020ft³: 14½'×24½'×8½'. I get substantial cabin vessel gain below 20Hz. I have been able to directly compare the ported subs in the den (no room gain below 15Hz) to the PSA S3000i. My observations coincide with predictions Mark Seaton made before I even received the FV18 & Cap118. My goal for this room is strong single digit extension w/low distortion.
Why sealed? The ports' output is simply not as accurate/detailed as the driver. With the variable tune Rythmik FV18 the SQ noticeably increases as you plug ports, moving the tuning frequency from 16Hz to 12.5Hz to 10Hz. The output with the 10Hz tune is not much different than a sealed sub though. There are also other potential port noises like chuffing and pipe resonance. The slot ports of Cap118 & MFW-15T (slotted & flared) can be pushed much harder than the Rythmik FV18 before port noises become audible. Facing the Rythmik away from the MLP masks much of the port noises but will reduce the tactile impact when placing nearfield. Its all fun to experiment with but not what I want to deal with upstairs.
I think my two rooms are great examples of properly matching subs to the room. The downstairs den is open concept on concrete. I also had a lower budget for this room. Dual MFW-15 Turbos nearfield (<$2k) are great fits for the room. It will be interesting to see how the Seaton F18s compare in this room as I can place them nearfield directly behind the seats. The F18s are way over my budget for the room though. <
My upstairs media room is sealed and on a raised platform floor. Unfortunately it is rather narrow. I was using four PSA subs but wanted MORE output below 25Hz with lower distortion. While PSA provides some measurements down to 10Hz, below 16Hz is not a consideration during their design process. Seaton, JTR, and Funk seem to be best inline with my goals.
The Seaton F18s and JTR S1 & S2 subs are a manageble 18" deep (I looked at several pre-owned JTR S2s before finalizing on the Seatons). All of the ported options are much deeper. The upcoming Rythmik F18 & F28 will have the same footprint as the FV18 & FV25 so too deep for my needs. Brian D. and I explored some DIY options but in the end F18+ system makes more sense. The flexibility of the F18+ system is what makes it so attractive to me. I am also going to be utilizing a pair of Funk custom DO 12s nearfield (also shipping this week) which perform similarly to 18.0Cs but with more low-end. If I desire even MOAR I can just add 2 more F18 slaves or even another master. So, while ported may give me good bang-for-buck sealed is the best solution fit.
BTW, the only reason I am able to have so many quality subs is the WAF. Master the WAF and the sky is the limit! I only want 25% of what
has achieved in his home!