Lilmike's Cinema F-20 - Page 59 - AVS | Home Theater Discussions And Reviews
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post #1741 of 1757 Old 12-08-2014, 04:52 PM
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Just reporting, with a heavy heart, that the Dayton DVC in my F20 "Macho Nacho" died in the line of duty a few months ago. I haven't yet had the heart to recover the corpse. I imagine the sealed enclosure still smells of death.


Had me or my drunken guests been paying attention, we might have heard the screams of agony before it was too late. My only solace is knowing that a heart transplant is possible, and Macho Nacho will, one day, live again to vibrate tools and paint cans onto the floor of my garage.
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post #1742 of 1757 Old 12-09-2014, 05:12 PM
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post #1743 of 1757 Old 12-09-2014, 07:29 PM
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I purchased 2 of the MFW-15's a few years ago from Eric, never used them at that time, and then moved to a new house with no theater yet.....at least THIS time I'll be building my room to my liking, and have something that I'll be able to use at anytime, instead of hearing " Turn it down!" all the time.
Was going to do ported when I got them....the room will be ~ 1600cu, so a modest amp and 2 F-20's should be plenty.

I'm actually excited to get the room started so I can build the subs!

Thanks for sharing all this info lilmike, this is a LONG thread!

Why waste $ on more cheap stuff, it's like challenging a dragon with a pocket knife.
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post #1744 of 1757 Old 12-17-2014, 06:48 PM
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and the dead rise...

Just popping in to say I put together a pair of these over the weekend for a friend with the RS HiFis.
I thought about folding an old model I had, until I remembered about this one, and saw that it was about the same as what I had hacked out.

Thanks for doing all the grunt work mikey.

Two in a room with no dimension over 12ft. He seems happy.
I have already put thoughts into his head about what a B&C 21" horn could do, but I am going to use one of mine this time...
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post #1745 of 1757 Old 12-17-2014, 07:00 PM
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Sweet!

______________________________________________
Joe = LFE Addict
Joe's LOWARHORN build
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post #1746 of 1757 Old 12-18-2014, 11:50 AM
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I am trying to deguise these as antique trunks.... So can I make them downfiring or fire toward the wall? If so how far does the mouth of the horn have to be from the wall or floor?
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post #1747 of 1757 Old 12-31-2014, 09:21 PM - Thread Starter
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Quote:
Originally Posted by soho54 View Post
and the dead rise...

Just popping in to say I put together a pair of these over the weekend for a friend with the RS HiFis.
I thought about folding an old model I had, until I remembered about this one, and saw that it was about the same as what I had hacked out.

Thanks for doing all the grunt work mikey.

Two in a room with no dimension over 12ft. He seems happy.
I have already put thoughts into his head about what a B&C 21" horn could do, but I am going to use one of mine this time...
Damn... thought I had checked out for a bit...

No thanks needed, thank you.

Soho... Damn, I am ever glad to see you checking in. Huge props to you, for had you not challenged me to learn what I still needed to back when you did, I never would have accomplished what I have managed since. More importantly, I would not have realized that I was only looking at the tip of the iceberg when I thought I understood far more. Hope all is well.

Glad the F-20s deliver.
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post #1748 of 1757 Old 12-31-2014, 09:24 PM - Thread Starter
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Quote:
Originally Posted by Forte_II View Post
I am trying to deguise these as antique trunks.... So can I make them downfiring or fire toward the wall? If so how far does the mouth of the horn have to be from the wall or floor?
That's a BIG trunk.

Give them some room. Make sure that the immediate area the mouth is firing into is greater than the area of the mouth.

To use numbers, I'd make sure that the mouth was no closer than ~18" from a boundary.
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post #1749 of 1757 Old 12-31-2014, 10:09 PM
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Quote:
Originally Posted by lilmike View Post
That's a BIG trunk.

Give them some room. Make sure that the immediate area the mouth is firing into is greater than the area of the mouth.

To use numbers, I'd make sure that the mouth was no closer than ~18" from a boundary.
Yeah, think big steamer trunks...
Hmm... That wont work. WAF, wasnt an issue when I was single!!! LOL

Yamaha RX-A700, Samsung BD, Sonos Connect Carver M-400X powering My DIY front mains (2 Vifa PL17's, Vifa XT25 with 3rd order HP, 2nd order LP (4th order LR acoustic)). Samson 1200 powering a pair of Dayton RSS 15 HF subs in 4.5ft sealed cabs.Still have (bought in 1993) the Klipsch RC- 7center and a pair of Bose 305's that were laying around from somewhere...
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post #1750 of 1757 Old 02-25-2015, 02:46 PM
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post #1751 of 1757 Old Today, 09:32 AM
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I would like to build two F20s and make them look like a continous long cabinet at the front of my HT (with some shelf space in the middle). This would mean laying the F20s on their 20" side and moving the mouth opening to the 29" side.

1. Since the drivers will be facing down, are any of the recommended 15" woofers better suited to avoid cone sag?

2. What's the best way to move the mouth cutout to the 29" side?

Thanks,
Darrell
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post #1752 of 1757 Old Today, 11:46 AM
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This is a folded horn. You cant just switch the mouth to another side. That would require redesigning the entire horn...
Quote:
Originally Posted by darrellh44 View Post
I would like to build two F20s and make them look like a continous long cabinet at the front of my HT (with some shelf space in the middle). This would mean laying the F20s on their 20" side and moving the mouth opening to the 29" side.

1. Since the drivers will be facing down, are any of the recommended 15" woofers better suited to avoid cone sag?

2. What's the best way to move the mouth cutout to the 29" side?

Thanks,
Darrell

Yamaha RX-A700, Samsung BD, Sonos Connect Carver M-400X powering My DIY front mains (2 Vifa PL17's, Vifa XT25 with 3rd order HP, 2nd order LP (4th order LR acoustic)). Samson 1200 powering a pair of Dayton RSS 15 HF subs in 4.5ft sealed cabs.Still have (bought in 1993) the Klipsch RC- 7center and a pair of Bose 305's that were laying around from somewhere...
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post #1753 of 1757 Old Today, 12:07 PM
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Quote:
Originally Posted by Forte_II View Post
This is a folded horn. You cant just switch the mouth to another side. That would require redesigning the entire horn...
I'm pretty sure he talked about doing that somewhere in this long thread, but I was having trouble finding it.
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post #1754 of 1757 Old Today, 12:29 PM
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Found it:


Quote:
Originally Posted by lilmike View Post
Quote:
Originally Posted by dutchswan0311
This is the only modification that I can see will allow for a mouth on the side of the F20 that is of the same dimensions as the original. Does anyone see any issues with this design not working as well as the original design? Feedback is greatly appreciated! If anyone is able to model it, that would be even better (that is not a capability I have).

Nope, do not do it that way.

Will post a sketchup of what I'd suggest as soon as I can.

And.....moments later.....



All of the updated Sketchup files are in the attached zip.

This will work, but it will be a bit different that what I made, as the horn path is shortened by a foot or so. I am not planning on building one to check it and see if it works OK, but changing the horn length by a foot in the model suggests that things will be fine.
<a class="attachment loginreq" href="/attachments/9708" title="">Cinema F-20.zip 48.2529296875k . file
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post #1755 of 1757 Old Today, 05:29 PM
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Yes he refolded it for him. It is no longer the same design...

Yamaha RX-A700, Samsung BD, Sonos Connect Carver M-400X powering My DIY front mains (2 Vifa PL17's, Vifa XT25 with 3rd order HP, 2nd order LP (4th order LR acoustic)). Samson 1200 powering a pair of Dayton RSS 15 HF subs in 4.5ft sealed cabs.Still have (bought in 1993) the Klipsch RC- 7center and a pair of Bose 305's that were laying around from somewhere...
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post #1756 of 1757 Old Today, 05:45 PM - Thread Starter
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Quote:
Originally Posted by Forte_II View Post
Yes he refolded it for him. It is no longer the same design...
Actually, I didn't.

All I did was calculate a side-mouth of an appropriate area for the horn and draw that on the horn side. As I recall (and I didn't go back and read the thread) dutch had a smaller rectangular opening that would have choked the horn, hence my saying don't do that. There are other changes too, like the side panel is full height, not clipped.

It should all be in the plans.
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post #1757 of 1757 Old Today, 06:12 PM
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Thanks Mike. Any recommendation on a driver that resists sagging?
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