Lilmike's Cinema F-20 - Page 19 - AVS Forum
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DIY Speakers and Subs > Lilmike's Cinema F-20
lilmike's Avatar lilmike 07:34 PM 06-11-2011
Thanks. I'm actually feeling pretty good today, that or I grabbed the wrong bottle of pain meds....

The other builds are all underway, but no threads yet. Things have been mentioned here and there. Anymore, I typically finish stuff, then measure it and post.

Steve_Vai_rules's Avatar Steve_Vai_rules 09:09 PM 06-11-2011
hope you are up and about soon. my dad messed up his knees playing rugby for too many years!! take care of them!!

Matt
notnyt's Avatar notnyt 03:06 AM 06-13-2011


Just cranked out two of these this weekend with Kibe29. Fairly easy build. Acquired lumber and stuff and had two built within two days. I'm sure he'll post a thread soon with all the pics and his impressions of the build. The output is fairly impressive.

Have you plotted driver excursion yet? I'd be interested to see that.
diaz's Avatar diaz 01:10 PM 06-13-2011
Quote:
Originally Posted by notnyt View Post



Just cranked out two of these this weekend with Kibe29. Fairly easy build. Acquired lumber and stuff and had two built within two days. I'm sure he'll post a thread soon with all the pics and his impressions of the build. The output is fairly impressive.

Have you plotted driver excursion yet? I'd be interested to see that.

Nice build! Thanks for the pic!
diaz's Avatar diaz 01:12 PM 06-13-2011
lilmike, after looking at your build for a while - is the F20 basically a sealed enclosure with a horn around it? This would mean that it would have the same response as a sealed enclosure, with the bandpass boost effect of the horn added to its output?

Thanks
beastaudio's Avatar beastaudio 02:01 PM 06-13-2011
Looks great! Makes me want to build another one I miss the woodworking. I need a new project...
kibe29's Avatar kibe29 08:30 PM 06-13-2011
I'll start a thread soon. I'm still recovering from the crazy weekend of building. I finished painting one of them today. Hopefully I'll have a chance to try it out after work tomorrow. The second one has to be routed and the access panel installed then it will be ready to have the finish work done.

I have a question on powering it. I have a consumer amp, an Adcom 555II to be exact that I was planning to use to power it. 325watts into 4 ohms so it's perfect. I bought and received the minidsp rev A since I'm using a consumer amp. The problem is I just looked up the specs from Adcom's website and it says input sensitivity is 1.75v and gain is 27db. I think this will be a problem with the standard minidsp. Any thoughts?
lilmike's Avatar lilmike 08:38 AM 06-14-2011
That is a great amp.

As far as the MiniDSP? I'd try it and see - you have it already.

I agree though - the specs do indicate that the sensitivity may be an issue. According to their specs, the MiniDSP does only output 0.9 V RMS. Perhaps a preamp after the miniDSP would help?
louisdamani's Avatar louisdamani 06:35 PM 06-15-2011
Is there a time delay for this enclosure(if it's used along with sealed subs) and will the 15" version of the below subwoofer work? Thanks in advance lilmike.

http://www.kicker.com/sites/default/...C101215Man.pdf
lilmike's Avatar lilmike 07:28 PM 06-15-2011
Quote:
Originally Posted by louisdamani View Post

Is there a time delay for this enclosure(if it's used along with sealed subs) and will the 15" version of the below subwoofer work? Thanks in advance lilmike.

http://www.kicker.com/sites/default/...C101215Man.pdf

Delay? Yup, it is a horn, there is an additional 420.3 CM of path in front of the driver, or about 12 milliseconds at sea level.

4.2 meters/344 meters/second = 0.012 seconds.

If those specs are accurate, those Kicker 15s will work great in this cabinet. They are basically a drop-in replacement for the MFW. The SPL plots overlay each other. Just like the MFW, the model says that there might be excursion issues right at the box tune (19 Hz) but other than that, they're power limited, just like the MFW is.

I do know that the 2010 Kicker Comp 15s have different specs. If the specs above are for the driver you have (2003 -2007 Comp Series), they will work. If you picked up drivers at Best Buy yesterday (2010 Comps), chances are they won't.
louisdamani's Avatar louisdamani 08:20 PM 06-15-2011
Quote:
Originally Posted by lilmike View Post

Delay? Yup, it is a horn, there is an additional 420.3 CM of path in front of the driver, or about 12 milliseconds at sea level.

4.2 meters/344 meters/second = 0.012 seconds.

If those specs are accurate, those Kicker 15s will work great in this cabinet. They are basically a drop-in replacement for the MFW. The SPL plots overlay each other. Just like the MFW, the model says that there might be excursion issues right at the box tune (19 Hz) but other than that, they're power limited, just like the MFW is.

I do know that the 2010 Kicker Comp 15s have different specs. If the specs above are for the driver you have (2003 -2007 Comp Series), they will work. If you picked up drivers at Best Buy yesterday (2010 Comps), chances are they won't.

Upon further investigation I have 10C154 which are the 2010 version. They have less T/S parameters listed than the previous versions .

http://www.kicker.com/sites/default/...gual%20e01.pdf
lilmike's Avatar lilmike 10:13 PM 06-15-2011
They work better than I thought they would, but they are not that good of a fit to be honest.

New one in black, old one in gray.



That's a pretty big hole there at 30 Hz. The dip is in an excursion minima, so in theory, you could EQ it, but you run the risk of burning up the coil. Filling a 6 dB hole takes a fair bit of power, essentially a fourfold increase.
LL
louisdamani's Avatar louisdamani 09:15 AM 06-16-2011
Thanks Mike. I'll use a couple MFW-15 drivers out of my sealed subs when I make the F-20 cabinets.
MKtheater's Avatar MKtheater 09:19 AM 06-16-2011
Hey mike, can these be turned upside down with the port on top? If so I could get my ceiling gain as well and make a bass array.
beastaudio's Avatar beastaudio 09:46 AM 06-16-2011
Quote:
Originally Posted by MKtheater View Post

Hey mike, can these be turned upside down with the port on top? If so I could get my ceiling gain as well and make a bass array.

Driver will still be in a vertical alignment standing with the mouth on top. It will be fine. I actually did this for a bit while testing locations but really the front sub's mouth needed to be on top and I cant fit the f-20 on either side of the screen, so it laid back down
MKtheater's Avatar MKtheater 12:40 PM 06-20-2011
Another question, I have 4 JBL 2225's sitting here doing nothing, will they work in these cabinets?
Rob Flanery's Avatar Rob Flanery 06:35 PM 06-20-2011
Quote:
Originally Posted by MKtheater View Post
Another question, I have 4 JBL 2225's sitting here doing nothing, will they work in these cabinets?
No, but they will work in mine .
lilmike's Avatar lilmike 07:16 PM 06-20-2011
Quote:
Originally Posted by MKtheater View Post
Another question, I have 4 JBL 2225's sitting here doing nothing, will they work in these cabinets?
Not well. They have too high an Fs and a bit too much motor.



There are FAR better places to use these drivers, like in my new mains...
LL
MKtheater's Avatar MKtheater 08:19 PM 06-20-2011
I will trade them if anyone is interested.
chrapladm's Avatar chrapladm 01:26 AM 06-21-2011
Mk you always seem to have a bunch of good drivers. Did you make any progress on your F20s?

I am really interested in your opinion going from a pair of DTS10s.
ReneV's Avatar ReneV 02:32 AM 06-21-2011
Is this the stuff you use to assemble these beasts?

(The slight obscurity in my question is related to international-shipping concerns ...)
Rob Flanery's Avatar Rob Flanery 03:46 AM 06-21-2011
Quote:
Originally Posted by ReneV View Post

Is this the stuff you use to assemble these beasts?

(The slight obscurity in my question is related to international-shipping concerns ...)

That's the stuff, but it is a rather small container. You would not get far with a 4oz tube. I am not sure where you are shipping to, but I am pretty sure that you can find a suitable adhesive where you live. It is an expanding polyurethane adhesive. Pretty common in the construction industry. I have used other polyurethane adhesives to build these things as well. Go to your local hardware store and talk with the folks there. I am sure they can get something that will work for you.

If your cuts were uber precise you could use Titebond or another wood glue. But it won't help to bridge sloppy cutting gaps like the polyurethane does. With my cutting skills I definitely need it.
MKtheater's Avatar MKtheater 09:10 AM 06-21-2011
Quote:
Originally Posted by chrapladm View Post
Mk you always seem to have a bunch of good drivers. Did you make any progress on your F20s?

I am really interested in your opinion going from a pair of DTS10s.
As you know, I have eD cutting the wood for me but I ended up having them build them!! They will be black when done. I had them take pics along the way to see how they go together.
MKtheater's Avatar MKtheater 09:20 AM 06-21-2011
Here are some pics












Tom Bley's Avatar Tom Bley 09:30 AM 06-21-2011
Nice! Thanks for the pics. Looks like a lower grade of ply. That's not Baltic Birch ply is it?
MKtheater's Avatar MKtheater 09:48 AM 06-21-2011
Auraco ply.
desertdome's Avatar desertdome 10:05 AM 06-21-2011
I try to never point a nail gun at my hand. Sometimes the nail can penatrate due to a void or soft spot in the plywood. Of course if I was making these I'd probably be doing the same.


MKtheater's Avatar MKtheater 10:09 AM 06-21-2011
Quote:
Originally Posted by desertdome View Post

I try to never point a nail gun at my hand. Sometimes the nail can penatrate due to a void or soft spot in the plywood. Of course if I was making these I'd probably be doing the same.


Well, these are the guys at eD. I would most likely shoot myself somehow. I will have more pics and once I get them up and running I will start a thread with all the pics, measurements, distortion, etc....
petew's Avatar petew 11:05 AM 06-21-2011
Quote:
Originally Posted by desertdome View Post

I try to never point a nail gun at my hand.

It really hurts when you stick a nail into that fleshy part at the base of your thumb. Insert safety glasses nag here.
lilmike's Avatar lilmike 02:55 PM 06-21-2011
Brad nail plus fingertip = lots of blood.

Yeah. It hurts....
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