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post #11 of 25 Old 04-11-14, 12:13 PM
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Re: Rythmik FV15HP

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Mike0206 wrote: View Post
However if it's port chuffing then I could see someone wanting to back off a bit. That could lead someone to say too much bottom end I suppose.
Agreeing with you, in my opinion, that would that be an excellent reason to buy a second subwoofer?

We had boomy with our system but it was boomy because I had the gain on the subwoofer turned up to high. I don't like boomy so I turned the gain back down. I solved all our problems by purchasing a pair of FV15HPs, a XT32/SubEQ HT equipped AVR and installed and got a freeware copy of REW up and running to be able to measure and tweak the settings.

I state the above only because it's a thread about FV15HPs.

Last edited by BeeMan458; 04-11-14 at 12:21 PM.
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post #12 of 25 Old 04-11-14, 01:02 PM
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I hear you Bee, I was pondering dual rythmik FV15HP's for my sub upgrade but I decided on dual DIY FTW-21's. That should give me some output!! Glad your happy with your rythmik's.
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post #13 of 25 Old 04-11-14, 02:04 PM
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Re: Rythmik FV15HP

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I hear you Bee, I was pondering dual rythmik FV15HP's for my sub upgrade but I decided on dual DIY FTW-21's.
Very happy with the pair of FV15HPs and you went DIY FTW-21s?

...

34mm Xmax

...

Now thass a lotta air being moved. We have 3300^3 open to kitchen and other areas and can feel the breeze coming across the floor.

What's it like when you're cranking your system?
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post #14 of 25 Old 04-11-14, 02:50 PM
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Oh I just ordered them early this week. Won't be in til next week at the earliest. My space is huge hence the reason I went with 2 FTW-21's. I'm at near 7500cu ft for the great room area which is family room and kitchen and completely open. I'll let you know how it all sounds in a few weeks when it's all complete.
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post #15 of 25 Old 04-11-14, 02:54 PM
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Re: Rythmik FV15HP

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Oh I just ordered them early this week.
That's some exciting stuff. Hope the box assembly goes without troubles. I'd have to go to a cabinet shop to get the box assembled. Are you going with a 4^3 or 6^3 box?

Thass a big room to have to light up. At 7500^3, are two FTW-21s going be enough? I'd guess you'd need three, maybe even four to fill a room the way folks like us want.

...
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post #16 of 25 Old 04-11-14, 03:41 PM
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The cabinets will be around 7.5 cu ft maybe a tad bigger. I'm hoping they'll be enough but if not, two more it is
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post #17 of 25 Old 04-11-14, 04:27 PM
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Re: Rythmik FV15HP

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The cabinets will be around 7.5 cu ft maybe a tad bigger. I'm hoping they'll be enough but if not, two more it is
Maybe a pair of Gjallarhorns?
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post #18 of 25 Old 04-12-14, 02:20 AM
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Re: Rythmik FV15HP

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The cabinets will be around 7.5 cu ft maybe a tad bigger. I'm hoping they'll be enough but if not, two more it is
But that is only .01% of the room volume... Isn't the rule of thumb ~1%
Seriously though, looking forward to your pursuits. I thought my space was large at 5000 cubes open to the remainder of the house... I guess not!
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post #19 of 25 Old 04-12-14, 06:14 AM
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Quote:
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Maybe a pair of Gjallarhorns?
Cabinet size would be a little too big. Haha! I think dual 21's will be enough for me. I could place my most recent build, dual 10", near field to have a little extra mid bass if I need it but I doubt that will be necessary. If you look at at data-bass.com you'll see the UXL-18 and the FTW is basically the same motor and voice coil assembly. Just the cone is different. I'll have them in a bigger box then they tested the UXL in so look to upwards of 4-6db difference as that's what I got with WinISD. Having duals adds another 6db to the output I believe from what I've read regarding subs. So output would be as follows.....

10hz- 104.2db
12.5- 108.2
16- 114.1db
20- 120db
25- 125.1db
30+- 130db +

Of course these are 2m ground plane measurements outdoors. Just imagine what it'll be in room! These numbers also follow closely to what I modeled in WinISD. Pretty close to a Gjallarhorn's output in the 25hz and below area and putting out more in the 30hz and above.

Last edited by Mike0206; 04-12-14 at 06:55 AM.
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post #20 of 25 Old 04-12-14, 06:16 AM
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But that is only .01% of the room volume... Isn't the rule of thumb ~1%
Haha! Let me get on it then so I can finish my 750 ^3 enclosures! That would be something else wouldn't it?!
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