NEW MFW-15 amps (May 2010) *pics* - Page 88 - AVS Forum
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post #2611 of 2680 Old 07-03-2014, 11:15 AM
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My MFW-15 just started the hum, I don't really have the money to sink into a new amp so if anyone in the Detroit area has any interest in this sub, just make an offer.

Thanks
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post #2612 of 2680 Old 07-03-2014, 11:25 AM
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Quote:
Originally Posted by Merlin803 View Post
My MFW-15 just started the hum, I don't really have the money to sink into a new amp so if anyone in the Detroit area has any interest in this sub, just make an offer.

Thanks
No new amps are available for the MFW15. I have not had them in almost two years now. You can find the "Hum Fix" a few pages back in this thread it is very easy and inexpensive to do. Less than ten dollars in parts and usually less than fifty dollars even if someone else does the soldering! No need to sell or get rid of your sub.

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post #2613 of 2680 Old 07-03-2014, 11:29 AM
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Merlin

I can solder in the caps for you and we can give that a try if you want, I am on the west side of detroit. I will have to check but I should have them in stock.

Plus you can hear what the Turbo can do

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Originally Posted by Merlin803 View Post
My MFW-15 just started the hum, I don't really have the money to sink into a new amp so if anyone in the Detroit area has any interest in this sub, just make an offer.

Thanks
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post #2614 of 2680 Old 07-03-2014, 11:53 AM
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Merlin

I can solder in the caps for you and we can give that a try if you want, I am on the west side of detroit. I will have to check but I should have them in stock.

Plus you can hear what the Turbo can do
Hey, if you think that you could solder the caps for me and it would salvage the sub then just let me know what you need from me. I was getting ready to pull the trigger on a Dayton Audio SUB-1500 but if the fix wouldn't cost much then I could hold off.

(I could just imagine what the Turbo could do...)

Thanks

Last edited by Merlin803; 07-03-2014 at 12:15 PM.
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post #2615 of 2680 Old 07-03-2014, 12:23 PM
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Hey, if you think that you could solder the caps for me and it would salvage the sub then just let me know what you need from me. I was getting ready to pull the trigger on a Dayton Audio SUB-1500 but if the fix wouldn't cost much then I could hold off.

(I could just imagine what the Turbo could do...)

Thanks

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post #2616 of 2680 Old 07-05-2014, 03:43 PM
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PM sent
She is back up and running, thanks for replacing the caps Kevin!
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post #2617 of 2680 Old 07-06-2014, 01:38 PM
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Glad I could help and it worked

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She is back up and running, thanks for replacing the caps Kevin!
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post #2618 of 2680 Old 07-07-2014, 06:25 PM
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^^ awesome, Kevin!

I'm still enjoying my 3+ year-old v1 Turbo. Watched "World War Z" this past weekend, and some of the LFE was absolutely ridiculous...to the point where I was worried about my house structure... If you're ever traveling in the Seattle area, you'll have to come by for some local brews and media room demo's...
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post #2619 of 2680 Old 07-07-2014, 10:21 PM
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I just want to send a really big THANK YOU for the info to fix the hum on this sub. One of my two started humming out of the blue last week and I really didn't want to buy a new sub right now. It was actually by chance that I found this thread. I received the recommended parts today and the sub is back up and running. Already watched a movie on it (The Lego Movie ). I also bought extra parts in case the other one decides it wants to go bad.

Thank you again!!!
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post #2620 of 2680 Old 07-10-2014, 05:28 AM
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Quote:
Originally Posted by mak99 View Post
^^ awesome, Kevin!

I'm still enjoying my 3+ year-old v1 Turbo. Watched "World War Z" this past weekend, and some of the LFE was absolutely ridiculous...to the point where I was worried about my house structure... If you're ever traveling in the Seattle area, you'll have to come by for some local brews and media room demo's...
I'm in the Seattle area. I have two MFW-15's that I am looking to Turbo upgrade this summer. I'd LOVE to come by to hear yours.

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post #2621 of 2680 Old 07-10-2014, 02:06 PM
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I'm in the Seattle area. I have two MFW-15's that I am looking to Turbo upgrade this summer. I'd LOVE to come by to hear yours.
We could probably figure something out...glad to host a fellow AVS'er!

Though from some of your recent postings here and here, it made it sound like you already had a Turbo kit?

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The Turbo kit would have any of those options for lunch.
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Go with the Turbo, all the way. It will stomp the PSA. I do believe the Turbo upgrade is back in stock now.

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post #2622 of 2680 Old 07-14-2014, 12:29 AM
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I'm in the Seattle area. I have two MFW-15's that I am looking to Turbo upgrade this summer. I'd LOVE to come by to hear yours.
There must be something in the water around here! I'm in Bothell and just pulled the trigger on a turbo. I did the capacitor fix a few months back, and so far so good - but I figure this is the best possible insurance policy.
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post #2623 of 2680 Old 07-14-2014, 09:48 PM
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There must be something in the water around here! I'm in Bothell and just pulled the trigger on a turbo. I did the capacitor fix a few months back, and so far so good - but I figure this is the best possible insurance policy.
Congrats! Me thinks you'll be happy...

FWIW, I don't run my sub hot at all and it seems to have no problem pressurizing my space, which consists of the media room (~16x20), a connecting hallway (~15x3), and just-set-up music room (~30x12). So around 5,500 ft3 by my rough calcs taking into account some perimeter soffits. It's a funky basement layout...

Also, I posted some installation tips over on the Seaton forum a few years ago, might be worth checking them out...

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post #2624 of 2680 Old 07-14-2014, 11:48 PM
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Congrats! Me thinks you'll be happy...
I have very little doubt about that!

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FWIW, I don't run my sub hot at all and it seems to have no problem pressurizing my space, which consists of the media room (~16x20), a connecting hallway (~15x3), and just-set-up music room (~30x12). So around 5,500 ft3 by my rough calcs taking into account some perimeter soffits. It's a funky basement layout...
That's far more air than I'm dealing with. The overkill factor is going to be very high, at least until I move (which may be sooner than planned, if the sub causes the foundation to shift).

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Also, I posted some installation tips over on the Seaton forum a few years ago, might be worth checking them out...
Yep, I found your notes here - thanks very much!
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post #2625 of 2680 Old 07-16-2014, 02:42 AM
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Quote:
Originally Posted by Merlin803 View Post
My MFW-15 just started the hum, I don't really have the money to sink into a new amp so if anyone in the Detroit area has any interest in this sub, just make an offer.

Thanks
There's a deal in my area for 2 of these used MFW-15s for 550 (together) .. Worth taking a chance for that price?
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post #2626 of 2680 Old 07-22-2014, 11:45 AM
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There must be something in the water around here! I'm in Bothell and just pulled the trigger on a turbo. I did the capacitor fix a few months back, and so far so good - but I figure this is the best possible insurance policy.
LOL, it must be! I'm up in Mill Creek, and my turbo kit should get here on Friday.... Want to have an install party?
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post #2627 of 2680 Old 07-22-2014, 12:23 PM
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LOL, it must be! I'm up in Mill Creek, and my turbo kit should get here on Friday.... Want to have an install party?
Hey, mine is supposed to get here Friday as well! Install party this weekend is ON! Otherwise, I'll leave my windows open so I can hear you doing your tests
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post #2628 of 2680 Old 07-22-2014, 11:38 PM
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LOL, it must be! I'm up in Mill Creek, and my turbo kit should get here on Friday.... Want to have an install party?
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Hey, mine is supposed to get here Friday as well! Install party this weekend is ON! Otherwise, I'll leave my windows open so I can hear you doing your tests
Congrats to both of you! Get 'em up and running quick...

Hmm, my Velodyne sub EQ has three output connections...there's three local MFW Turbos...
I think running all of ours together would either bring down my house or fry my electrical panel!
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post #2629 of 2680 Old 07-23-2014, 09:26 AM
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I can't join the install party (I'm in MN), but my Turbo is arriving today! Very excited to get that going this weekend!
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post #2630 of 2680 Old 07-25-2014, 01:27 PM
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It has begun...

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post #2631 of 2680 Old 07-26-2014, 09:31 AM
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I got my MFW-15 all taken apart last night to begin installing the Turbo. There's a big thick piece of insulation in the area behind the driver, but it only fills up 3/4 of the compartment it's in (behind the interior circlular cutout). Is it a good idea to fill that are up with more insulation or polyfill? I don't want to affect the sound in a negative way.
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post #2632 of 2680 Old 07-26-2014, 09:40 AM
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The big thing is to make sure it is not blocking the port.
I did some tests with adding pollyfill but little was gained.

Its nice to finally have the kits in stock and getting them out there

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I got my MFW-15 all taken apart last night to begin installing the Turbo. There's a big thick piece of insulation in the area behind the driver, but it only fills up 3/4 of the compartment it's in (behind the interior circlular cutout). Is it a good idea to fill that are up with more insulation or polyfill? I don't want to affect the sound in a negative way.
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post #2633 of 2680 Old 07-26-2014, 09:48 AM
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It looks like the port goes over top of that area I mentioned so I should be safe in just filling that interior compartment, I think.
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post #2634 of 2680 Old 07-26-2014, 10:47 AM
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You can fill behind that circular brace cutout and any other available surface that doesnt restrict the port. Polyfill, insulation, foam, all works. All your trying to do is soak up mechanical noise and harmonics that might be bouncing around the interior from contaminating port output or translating back through the cone. It wont change the dampening of the system in any meaningful way.

Just dont pack it in really tight or allow it to make contact with the driver, most importantly the cone.
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post #2635 of 2680 Old 07-26-2014, 03:14 PM
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The directions for the install state "The Rubber Gasket on the new driver is NOT used, I leave it on for shipping only to help protect the driver". Does this mean the rubber thing around the face of the driver with the screw holes in it? Should I pull that off when I install?

I dropped the driver into place with that gasket still on and it was a tight fit. Just wondering if I need to pull that off.
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post #2636 of 2680 Old 07-26-2014, 03:26 PM
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If you dont have the driver screwed down yet I would pull it off. A lot of cabinets wont accept the driver with the gasket on it. The extra thickness of hat rubber ring with the gasket tape may push the driver a bit closer to the face plate.

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The directions for the install state "The Rubber Gasket on the new driver is NOT used, I leave it on for shipping only to help protect the driver". Does this mean the rubber thing around the face of the driver with the screw holes in it? Should I pull that off when I install?

I dropped the driver into place with that gasket still on and it was a tight fit. Just wondering if I need to pull that off.

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post #2637 of 2680 Old 07-26-2014, 03:51 PM
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Thanks, got that pulled off. It fits much more comfortably in the cabinet now.

Attaching a pic of the gasket and the driver in the cabinet (note the outside edges of the driver) so others will save themselves some trouble. Pardon my dusty MFW-15 cabinet

I'm sure it's much to remove the gasket before the driver is in the cabinet
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post #2638 of 2680 Old 07-27-2014, 11:26 AM
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Install completed! It took about six hours yesterday, but most of that was battling my laptop (now DEAD) trying to get some before / after REW graphs. Actually install time was more like three hours. I haven't done any serious listening yet; I only played some music long enough to verify that the connections and amp are good. Impressions will come later.

Kevin does a fantastic job with these kits. I followed the original installation instructions here, and never had any issues or confusion. The only place I deviated a little from the instructions was at the end (based on reading experiences of others like mak99): before screwing down the new driver, I did a test fit of the faceplate to verify that I had the driver centered. That was a good move!

There was also a fun moment when a piece of backing from the gasket material fell into the port. Fortunately, tipping the sub upside down was enough to get it to slide back out.

What good is an install post without some pics?

Original driver with faceplate removed:



Original driver out, exposing the sub guts:



Upper cutout (where amp controls originally were) just after applying new gasket material:



Same thing, with new plate screwed down:



New gasket on lower cutout, where the original amp was located:



With new plate screwed down and binding posts installed:



Closeup of heavy duty, high quality binding posts:



Now the fun part begins! The new driver, as it was shipped (it's far bigger than it looks here):



The obligatory old vs new shot:



Wires hooked up. When doing this solo, having a table or some surface nearby to do this is a must:



New driver in, just before the faceplate went on:



A big thanks again to Kevin for making this kit available to us, especially so long after it was originally introduced! I can't wait to let it loose over the days to come!
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Last edited by tebling; 07-27-2014 at 11:30 AM.
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post #2639 of 2680 Old 07-27-2014, 11:53 AM
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Looking good! I'll echo your comment about putting the driver on an end table or something while you're hooking it up. I actually used an old, cheap wood dinner tray that I had laying around from my college days. It made the process a one person job.

How do you like your Gramma [I think that's what your subwoofer stand is]? Right now I'm flat on concrete -> pad -> carpet. Wondering if getting it a little bit off the ground would make much difference.

I tested out the sub this morning to make sure all my connections work. I'll have to give it a more thorough listen later, but my initial impressions are much tighter, harder hitting bass. Hard to say more beyond that at this point since I haven't had a working sub since late last year.
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post #2640 of 2680 Old 07-28-2014, 10:48 AM
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Congratulations on your turbo purchase. I have 2 turbo version 2 for a year and a half. They do take a break in period. Mine are hitting harder more than before. I am only using one now due to it,s tremendous output, I guess l will be in the market for a bigger home theater.

Last edited by paeast; 07-28-2014 at 11:10 AM.
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