Originally Posted by kennethav
I think I'm ready to join the BOSS team... been reading a ton, but wanted to make sure I didn't miss anything. Can you guys take a look at my plan and see if it looks OK?
* Design for my front row mini-riser attached. I'll be supporting a 3-part sectional couch (each section is its own distinct reclining chair). I've violating the 2-foot isolator rule, but I could move the isolators forward or back to rectify that. Or add a third row of isolators in the middle.
* The drivers won't fit under the couch, so I'm using a cantilevered design. I think the edges of the cone *will* fit under the couch, though (shown in the diagram). I'd get a new piece of plywood if necessary, but I'd rather keep it as narrow as possible.
* Was thinking I'd go for the MB Quarts simply because I missed the JBL sale. Are the JBL's preferred or are the Quarts just fine?
* My 2nd row is a bit unconventional... I have a pretty low ceiling and my AV rack is directly behind the middle seat of the front-row sectional. So I was planning on putting a tall drafting stool on another mini-riser, one behind each of the left and right sections of the couch. Will those stools be OK on a vibrating mini-riser?
* My 6th seat is a single recliner way over on the other side of the room, and I plan to put a third mini-riser under this one.
* For the single chairs, I was planning to use more of the MB Quarts, but am open to using a 15" driver instead. Any pros/cons on this decision? If I go with 15's and pair the drivers in series, I'd need to pair a 12" with a 15" on one of the channels -- is this OK?
* My amp is an old 5.1 AVR -- a JVC RX-6020. Specs say it's rated for 100W per channel min RMS driven into 8 Ohms. I don't know how accurate these values are though. The amp is also driving my rear height Atmos speakers. I'd have a pair of drivers on each of the other 3 channels. Does this sound OK?
* I've currently got two Aura bass shakers screwed to my main platform. It gives enough shaking when the chairs are upright and power is fully maxed, but the effect is very muted when the chairs are reclined. Will the subs do a better job of shaking when the chairs are reclined?
Thanks so much for any opinions you can offer.
kennethav.....Thanks for all the details. You're doing your homework
Your design for the front row looks awesome. No need to add a third row of isolators. The more isolators the less bounce effect. I wouldn't worry too much about going over the 2 foot rule. You're still close enough to minimize bending of the platform. Just be sure to use 3/4" plywood and you'll be all set. For the back isolator placement for your front row, since your cantilever drivers will be very close to the back legs, I'd recommend placing those isolators underneath the back legs. Since the center line of the drivers is so close to the legs themselves, there won't be much bending of the platform.
The MBQuarts are just fine and with the smaller profile, they are a bit easier to work with regarding fitment under the furniture. Having said that, the JBL's can normally be purchased for about $60-80 even when not on sale. The last time I checked, the MBQuart DS1-304 was about that same price and maybe slightly higher. Both will do great in a BOSS setup.
For the second row stools, I have some experience with bar stools with padded seats and wooden armrests on my back BOSS platform. They feel great, especially with my feet on the foot rests of the stools and off the platform and my arms resting on the wooden arm rests.
A mini-riser under the 6th seat will work great.
As far as mixing different drivers on the same circuit, I'd recommend not doing this. Only because 1 driver will need more power than the other to reach it's full potential. And, what's good for that driver may be too much or not enough for the other driver on the same circuit. Having the same drivers from the same manufacturer with the same impedance on each circuit is important to avoid these in-efficiencies. You could do it, but it won't be maximizing the extra money you've spent on the additional shaker potential if that makes sense.
Regarding the JVC AVR, 2 JBL's per channel will definitely work. This will provide about 50 watts per driver. You'll lose some TR below 10Hz with this setup, but the experience will still be great. Since you're considering the MBQuart's already, I'd recommend the DS1-304 model mentioned earlier. These drivers only need 20 watts each to reach their full potential unlike the JBL's which need 80 watts to reach their full potential.
Regarding using a BOSS platform when reclined. The answer is absolutely do it if you can. This is a discovery I recently made with my BOSS platforms. For the last year or so, I would always watch upright. We have 1 recliner and I remembered some of my VNF testing last summer delivered a more consistent experience when reclined. Still not perfect with VNF which is why I pursued another solution and the BOSS was born.
But, after remembering that reclined experience, I wondered if the same would happen with BOSS. The answer is a resounding YES. The same thing applies to BOSS, but the feeling is much more natural because your entire body is being enveloped by the TR from neck to upper legs instead of just certain parts of your body when sitting upright. Once you get everything setup, I highly recommend an LPF of 80Hz for the BOSS platform when fully reclined. The chest slam is amazing and combined with the ULF wobble in the single digits, the effect is very pleasing.
It's hard to describe....the best analogy I can think of is imagine dipping your foot into a hot tub and how good it feels. Then, you enter the hot tub and sit down in one of the seats, it feels even better. Then, if the hot tub allows, you lay down in the hot tub recliner and the experience is even better, especially if you have massaging jets on the bottom of the hot tub recliner. The same with BOSS, your entire body is immersed in TR goodness when fully reclined.
Anyway, sorry about the tangent....I'm loving my BOSS's so much these days in a reclined position. I can't say enough good things about the experience.
As always, as more questions come up during your design just let us know.
Hope this helps.