Since it has been almost a month of living with the new FV25HP I have a couple of questions.

Attached is a photo of my room layout. It is a sealed room that is approximately 2,000 cubic feet on concrete floor. With shorter 7 foot ceiling heights, couldn't work in a subfloor. It is about 95% home theater use and 5% music and I tend to listen at about -20 dB and boost the bass about 5 dB after running Audyssey. I don't know how much Audyssey might be boosting things, so let's say 5 dB (though could be as high as 9 dB). So I need subs that can handle peaks between 105 dB and 110dB at the very most. I want to have a pair subs placed as shown in the figure.

I was thinking a pair of G25HPs would work, but some have said that the tactile response would be lacking to that of a ported sub. So, I started thinking either a pair of FV15HPs or FV18s, since looking at Data-bass they get me right about where I would need even down as low as 10 to 12 Hz, depending on which model I choose. Up front the maximum height I can have with the subwoofer is about 18 inches, so that the center channel fits on the sub and below the TV screen, with the TV screen at a comfortable viewing height. A FV15HP will work, if I lay it on its side, but the FV18 will not. I know it is just a few inches difference, but I already have to angle up the center channel a bit and don't want to push up the height of the TV any more that it is already. In the back I don't have a height restriction at all, so if I wanted to I could go with a FV18 or FV25HP, if there is a noticeble difference in tactile response.


1. At the relatively modest listening levels I mentioned, would I notice a difference in tactile response on a concrete floor between the FV15HP, the FV18 or the FV25HP as my rear subwoofer?

2. Would I be able to get non matching subs as mentioned to blend well and smooth out the seat to seat variation, as well as a matching pair?

Attached Thumbnails

 

You mean you have a 7.1.4 system not 7.4.1. I would opt for dual F18s for that space or dual
G25HP


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Why are you putting the subs in those precise locations? Is that where they measure best or just placing them for how they look rather than how they sound?

I'd get the sub you want and make it fit...a couple inches is meaningless.

Right, 7.1.4.

But yeah, dual 18s aren't going to happen here.

Budget or space? The f18 are pretty compact


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'pretty compact' to AVSforum norms, I built the F18 dimensions in cardboard and my wife was like

But I managed to convince her. I'm only looking for options to get it to be a white cabinet.

Both, honestly. A pair of Piano Black ones would run me $3,360.00, which is close to double my budget (Piano black would be pretty much required for WAF - plus they'd more or less match my Paradigm Prestiges).

As far as size goes, I could actually get away with having one of them, but definitely not two. My MFW-15 measures about 24x15x24, vs the 20.5x20.5x23 for the F18. So a little shorter, quite a bit little fatter, and slightly less deep than what I have now. I could make it work in the present location.

However since I'm looking for a matched pair to help smooth out room modes, it becomes problematic, as I simply don't have anywhere to put two of these beasts. The only place might be under our baby grand piano in the back corner of the room, but wouldn't that rattle the hell out of the soundboard?

A pair of F12s would offer a lot more flexibility. Do you all really think those would be insufficient? Using a decibel meter, I tend to listen to music at around 85db, which isn't too crazy. I hear all the dynamics, but don't go deaf.

Its really all about your goals. The F12s are good subs but in that size space they would struggle to fill it. But if you are not looking to fill that space with bass then they would work fine. Just depends what u are after and listening to music at moderate levels with those subs would be just fine. Don’t expect chest thumping bass though.


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hi bro, saw u own Dual Rythmik FV18s Rev 2 with Paper cone with mini dsp HD

I just got a new FV18 aluminium cone.
Have 2 questions if u dont mind to share

1. have u heard both A and P cone any key difference? just curious Thanks.

2. Will the mini DSP HD help in the EQ of the 2 subs u have? Keen to explore this option.

Greatly appreciate u sharing big thanks.

Just trying to stick with Harmon's (Welti's) research that midpoint of opposing walls is optimal for reducing standing waves in a sealed rectangular room.


The center channel is 11 inches tall and will sit on the subwoofer as a speaker stand, and needs to be tilted up a bit to be aimed at ear level and I'm upgrading to a 77 inch OLED to go above it. I'm already pushing things heightwise about as far as I'd like to go. I put the FV15HP as the cutoff heightwise, because it is the sub that basically gets me the output that I need down to about 12Hz, in one port mode. I like that the FV18 or FV25HP extends a little bit lower and if I am right at the 105 to 110 dB peaks, they would be more composed down below 20 Hz (less distortion). However, I don't think that I will be pushing things that hard regularly, if at all.

A pair of FV15HPs at the front and back would work for me in terms of output levels. But, I was thinking that if there would be a significant difference in tactile response at -15 dB listening levels, why not use a FV18 or FV25HP for the rear subwoofer.

I think I *might* be able to do dual E15s. But still, in Piano Black, I'd be about $500 over my target max budget. Probably something I'd be able to talk myself into though. But for a matched pair, that's absolutely as large as I could go.

Hey my friend. Congrats on the FV18. That is one hell of a sub especially at that price point. I have heard the aluminum cone FV25HP so have an idea of how they sound. Main difference is that the paper cone has a warmer sound to it and a little more TR. I am 100% so the paper cone was my preference. But after hearing the aluminum cone I think I would have been happy with that too

I have the minidsp for entering bass equalization filters but am using it to present Audyssey a decent FR first


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Given the circumstances dual E15HP's sound like a good solution. If you're still concerned about output there's the E15HP2 as well. Same form factor but more output. Costs a little more though.

Dual E15's should be adequate for that size room. Dual F18's would be better, but cost and size is always a factor. Dual 12's would struggle to fill the space. I've been there and done that with dual F12's in a 3200 cu.ft. room.

One thing to remember is Rythmik's 10% discount on multiple subs. You can buy one now and get the 10% discount later but, unless they've changed their policy, if you buy two together now the 10% applies to both subs. Might help the budget a bit.

Yeah, I'd rather get both at the same time for the savings.

I recognize you from the Magnepan forum. Just curious, do you have a specific recommendation for a pair of .7is in this room?

Sorry, I've not been following closely (I tend to pop in between tests or over lunch, read a few posts, then skip out again).

What are the room dimensions, is it open or closed, where will the Maggies be sitting (how far from the wall behind and how near the MLP), where will you be sitting? What are your restrictions on sub size and placement? Is it for music, HT, both? If this has already been hashed out no need to do it again; link the post or PM me (or PM a link).

In a modest (~2000 cu ft) sealed room I used a pair of F12's with Magnepan MG-IIIa's for a number of years. I added another pair to help smooth the response (bad room dimensions), did not need the extra output.

HTH - Don

https://www.avsforum.com/forum/113-s...l#post57513692

That's a pretty large room (4000 cu ft). I like the pair of E15HP suggestion. Saving for the best is usually much better than compromising in the short term. As I have gotten older I have gotten better at following that strategy. Well, a little better...

Hey guys, just got my FV18 paper cone.

It was pretty cold outside and there's a small amount of moisture due to condensation. Should I let it warm up and wait for the moisture to go away before plugging it in and playing?

Thanks

Hi,

I have several thoughts on this. First, the mid-point of opposing walls can be a good solution for a rectangular room, but so can 1/4 length walls, diagonal corners, and other placements. Bear's point about getting the subwoofers you want and experimenting with placement is a good one, in my opinion. If I were you, I would put my CC on a speaker stand at the height you want, and try the subwoofer you want next to it, or somewhere else on the front wall. I don't think it will mind if it isn't precisely at the center of the wall, anyway.

I wouldn't be keen on mixing subwoofers with different tuning points and different frequency responses, if I were you. That would be inviting some cancellation problems, and some level-matching issues, especially if the stronger sub were actually closer to the listening position. Personally, I would get dual FV18's, with the paper cones. With the room gain you would be getting, I think that you would have all of the low-frequency SPL you could ever want. And, I think that the paper cone FV18's would definitely be helpful with respect to low-frequency TR on concrete.

Regards,
Mike

I'm probably preaching to the choir here but I wanted to chime in and say that Brian and Enrico recently went WAY out of their way to help me with a Rythmik sub issue (one I've had for 3+ years no less). They couldn't have been more patient or responsive. Very rare to find this level of service from another company, let alone from the head honchos!

Yes I would let sit for 24 hours or so.


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It's good that you are basing placement on where they should perform well. As far as capability, -15 MV for 100 dB, 5 hot puts you at 105, a little hotter with redirected bass puts you up to 110, so I think your estimates make sense. In my experience, in a room that is small enough to offer some room gain, you should be flat below 20 Hz until the sub starts to roll off quickly below tune. So a single FV15HP, with even a small amount of boundary and room gain, should be good for 110 dB at 20 Hz. A pair should be good for 115+, and this should put you solid into the low teens and close to 10 Hz. I think you'll be covered.

You are in a similar situation to me....typically not louder than -15 and I want 115 dB capability into the low teens to cover any scenario.

Not trying to dissuade you from considering FV18's, and I think Mike's suggestion of the paper cone version makes sense for TR for movies. It's never a mistake imo to buy a little more sub than you think you need. How likely is it that -15Mv will be the loudest you will listen, ever? Room treatment and high efficiency speakers, if you ever go that route, can make listening closer to reference more and more tolerable. I've been in theaters where reference level was easier on the ears than -10 MV in my room.

Can anyone here tell me how a pair of E15HP2 would fair against a pair of PSA S1510? I currently have a pair of S1510 in my living room set up, but the E15HP2 is very enticing, especially in the gorgeous piano black. I'm thinking of jumping on the servo bandwagon, but not sure if that would be more of a lateral move, instead of an upgrade. The reason I was eyeing the E15HP2 is the high power amp, and the 17" width. The layout of my room would make it impossible to fit anything wider, unless I bought a wireless sub kit and completely changed where the subs are currently set up.

Are you mostly music or HT?


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HT for sure. I listen to music on it, but not real "audiophile" stuff. Just through Spotify Connect.

It's currently a 3.2 set up, with KEF LS50 across the front. Once I get more funds, I'm going to expand to 5.2 for what it's worth.

Is there a reason why you are only considering sealed subs then? Ported are usually preferred for HT.


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The size difference. Which brings me to my next option, which was to trade in the S1510's towards a pair of V1510DF through PSA, which were about the "smallest" vented 15" sub I could find.

I think ported would be a better choice in that space. The V1811 is the most compact 18 inch sub available but does not dig very deep. However the output from that sub is really good