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NEW MFW-15 amps (May 2010) *pics* - Page 69

post #2041 of 2590
Quote:
Originally Posted by bencorn View Post

Fedex brought my amp today. Got it installed in minutes and fired it up. It was already late so I wasn't able to turn it up much but I'm back in business. Smile is back. This weekend I will do a subcrawl to find the best location, run MCAAC and tune the gain, and then watch a couple movies the way they were supposed to be watched.

Enjoy!


Thank You!
Murrel
post #2042 of 2590
Quote:
Originally Posted by murrel View Post

Well we all make mistakes! I know I do many times a week! Your amp should be fine. Take a look at the .1uf cap (50v ceramic disc) that sits next to them. It could of been damaged. Your amp should be fine.......if not he will have to either repair the damage or purchase you another amp.


good luck!
please let me know how it goes

Enjoy the rest of your weekend
murrel

I had the caps replaced on my V2 amp and the hum is gone.

When they were replacing the caps they noticed the place for the 3rd cap which I guess is the .1uf cap you mentioned. My amp did not have one there...I don't know if it was ever there. Should I have them put one there? and where can I find one... I got the other caps from parts express.
post #2043 of 2590
Quote:
Originally Posted by StimpsonJCat View Post


I had the caps replaced on my V2 amp and the hum is gone.

When they were replacing the caps they noticed the place for the 3rd cap which I guess is the .1uf cap you mentioned. My amp did not have one there...I don't know if it was ever there. Should I have them put one there? and where can I find one... I got the other caps from parts express.

If it is working I would just leave it. Not all of the parts are stuffed on the MFW15 power board

Have a good day
Murrel
post #2044 of 2590
Hey Murrel, i have a friend who's in need of a v3. You still selling those? Got a link?

Thanks again man!
post #2045 of 2590
Quote:
Originally Posted by edoggrc51 View Post

Hey Murrel, i have a friend who's in need of a v3. You still selling those? Got a link?

Thanks again man!

I do have a couple in stock. Due to forum rules (It would be considered advertising) I will pm you the link.


Thank you!
Murrel
post #2046 of 2590
Thank you so much. I'll forward him the info.
post #2047 of 2590
Update, my v3 is awesome. Apparently my v2 was failing in more ways than obvious because my sub seems quite a bit louder now with no static and the same gain on the knob. Thanks a bunch murrel.
post #2048 of 2590
Quote:
Originally Posted by edoggrc51 View Post

Thank you so much. I'll forward him the info.

Thanks!



Murrel
post #2049 of 2590
Quote:
Originally Posted by bencorn View Post

Update, my v3 is awesome. Apparently my v2 was failing in more ways than obvious because my sub seems quite a bit louder now with no static and the same gain on the knob. Thanks a bunch murrel.


bencorn,

Thank you! I know that QSC is late sometimes. And I appreciate everyone being patient. I am glad you can enjoy your sub again!

Murrel
post #2050 of 2590
Picked up two of these V3's from Murrell. Great service, great amps..Not much else to say! I don't think I hear a difference between the V2 and V3, but as I PLAN on keeping these subs awhile figured it would be a good idea..
post #2051 of 2590
Quote:
Originally Posted by streamerlover View Post

Picked up two of these V3's from Murrell. Great service, great amps..Not much else to say! I don't think I hear a difference between the V2 and V3, but as I PLAN on keeping these subs awhile figured it would be a good idea..

streamerlover,


Thank you for the kind words!

Glad the amps are working for you.


Have a great day

Murrel
post #2052 of 2590
How much can one get selling a MFW with a blow amp?
post #2053 of 2590
Quote:
Originally Posted by NumLock View Post

How much can one get selling a MFW with a blow amp?

Depends on your location and the finish of the cabinet..
The driver is worth about $70 if not blown and the cabinet could be worth money to some if you have the finish someone wants. (rosewood in my case)
post #2054 of 2590
Quote:
Originally Posted by NumLock View Post

How much can one get selling a MFW with a blow amp?

Why not upgrade the amp to the ver 3, that would be cheaper than getting a new sub that can give a equal SQ.
post #2055 of 2590
Hello everyone!

Well I did inventory today. I have enough parts to build 60 or so V3 amps. I doubt that I will try to source the parts that I am running out of. I do not have the buying power (cash) to order a large quantity of the needed parts. I also need to funnel my time and resources into some of my other products that I have been neglecting.

I will still be available for help and support to any and all MFW owners.


If you have questions or concerns feel free to contact me.

Murrel
post #2056 of 2590
Finally decided not to wait for the Turbo Kit Upgrade and went with (3) v3 amps. Can't wait!
post #2057 of 2590
Quote:
Originally Posted by trekker View Post

Finally decided not to wait for the Turbo Kit Upgrade and went with (3) v3 amps. Can't wait!

That is Sooo 2yrs ago........
post #2058 of 2590
Okay so I did the cap replacement a while back and one sub has worked prefect since then and on the other it worked fine then went right back to the hum/buzzing noise. Yesterday I decided to take it apart and see which cap had gone back and was going to try replacing it again. Upon inspection, one of the wires to the amp had disconnected very easily, so I connected it back, and the sub worked great again. All caps looked fine. About 20 min. into a movie, it started making the buzzing noise again. Took it apart once more, everything is connected fine and all caps look good, none have the blown/rounded look. Any other ideas?
post #2059 of 2590
Quote:
Originally Posted by urmystlkal View Post

Okay so I did the cap replacement a while back and one sub has worked prefect since then and on the other it worked fine then went right back to the hum/buzzing noise. Yesterday I decided to take it apart and see which cap had gone back and was going to try replacing it again. Upon inspection, one of the wires to the amp had disconnected very easily, so I connected it back, and the sub worked great again. All caps looked fine. About 20 min. into a movie, it started making the buzzing noise again. Took it apart once more, everything is connected fine and all caps look good, none have the blown/rounded look. Any other ideas?

The pcb can be damaged when removing the 470uf caps. I will post a fix that you can try when I get home tonight.


Murrel
post #2060 of 2590
Quote:
Originally Posted by urmystlkal View Post

Okay so I did the cap replacement a while back and one sub has worked prefect since then and on the other it worked fine then went right back to the hum/buzzing noise. Yesterday I decided to take it apart and see which cap had gone back and was going to try replacing it again. Upon inspection, one of the wires to the amp had disconnected very easily, so I connected it back, and the sub worked great again. All caps looked fine. About 20 min. into a movie, it started making the buzzing noise again. Took it apart once more, everything is connected fine and all caps look good, none have the blown/rounded look. Any other ideas?

Here is the fix for a damaged board. This is the bottom of the board you did the cap fix on. I like small single strand wire. Telephone wire works well.

Murrel
LL
post #2061 of 2590
Okay, thanks for the tip! I'll give it a try tomorrow. Anyway to tell if this actually needs to be done or not? Any effects on the board, good or bad doing it? Or is it a bad connection among these spots that causes that noise
post #2062 of 2590
Quote:
Originally Posted by urmystlkal View Post

Okay, thanks for the tip! I'll give it a try tomorrow. Anyway to tell if this actually needs to be done or not? Any effects on the board, good or bad doing it? Or is it a bad connection among these spots that causes that noise


It also could just be a poor solder joint. No bad effects. It repairs the circuit that is sometimes damaged when you remove one of the 470uf caps.

Murrel
post #2063 of 2590
Quote:
Originally Posted by murrel View Post

It also could just be a poor solder joint. No bad effects. It repairs the circuit that is sometimes damaged when you remove one of the 470uf caps.

Murrel


Unfortunately the wire trick didn't do the job. Still the same hum. Guess I'll just stick to my one working sub
post #2064 of 2590
Quote:
Originally Posted by urmystlkal View Post


Unfortunately the wire trick didn't do the job. Still the same hum. Guess I'll just stick to my one working sub

If you remove the audio input from the sub does it still hum?

Murrel
post #2065 of 2590
Yeah it still has the hum. I was wondering if it was a bad connection from the receiver to the sub so i checked that and figured that ruled that out. The sub also moves along to the bass like it should right along w/ my other sub, just has that constant hum along with it.
post #2066 of 2590
Quote:
Originally Posted by urmystlkal View Post

Yeah it still has the hum. I was wondering if it was a bad connection from the receiver to the sub so i checked that and figured that ruled that out. The sub also moves along to the bass like it should right along w/ my other sub, just has that constant hum along with it.

Is your amp a V1 (driver wires soldered to the board) or a V2 (driver wires connect to the board with spade lugs)?
post #2067 of 2590
V2, both connections were loose so i put new ones on and recrimped them.
post #2068 of 2590
Quote:
Originally Posted by yadfgp View Post

You DEFINITELY want to stop powering off and on the MFW, as that has been found to be 1 of the MAIN culprits in causing these amps to fail.

Just leave it on 24/7.

You know I see this claim again and again and I must be one lucky guy because I have power cycled my V2 amp probably at least a 1000 times now maybe more. I have all my subs on some X10 appliance modules and hard power them all off (only one is an MFW-15) when not in use but so far in 20 months my amp has kept going, no hum and no other problems. This is my second amp my first was swapped because of transformer noise within the first week I owned it. Given how hot it runs I would rather turn it off.
post #2069 of 2590
My V2 amp vented a cap near a choke or coil, it was 22uf or 470uf at 100V(I have to check again and verify), I think is the pre audio board not the power supply and output board driver. I replace it and the other caps mention and its back and running. I will problably be putting a fan on the bottom by raising the bottom, making a hole for a fan(3" to 4" like computer fan) that will be install in the bottom. And making a couple of holes on the side to vent the hot air and help keep the amps components cool.
post #2070 of 2590
The rest of the cabinet is not sealed to the amp cavity, any holes for fans or vents will be just like adding ports

Quote:
Originally Posted by razafina View Post

My V2 amp vented a cap near a choke or coil, it was 22uf or 470uf at 100V(I have to check again and verify), I think is the pre audio board not the power supply and output board driver. I replace it and the other caps mention and its back and running. I will problably be putting a fan on the bottom by raising the bottom, making a hole for a fan(3" to 4" like computer fan) that will be install in the bottom. And making a couple of holes on the side to vent the hot air and help keep the amps components cool.
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