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Mark_Seaton

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Reply with quote  #41 
Quote:
Originally Posted by waynew
I'm not really worried about it hurting anything.  It just gets annoying when the volume is low and the sub goes from inactive to active every now and then.  This would have never happened before my kids came along, but now I have the HT at "don't wake the 7 month old" volumes sometimes.

I'm a Stars fan, btw.


Good to hear you and a few others reporting back that you are enjoying your Turbo.

I'm not a big fan of the "auto" detection functions.  The OEM did make some changes long ago which made for a more audible turn on, but it's entirely harmless, especially to the Turbo driver.  My recommendation would be to use the 12V trigger found on the majority of receivers these days so it only turns on/off when you want it to.

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DTMIKE

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Reply with quote  #42 
Had the pleasure of helping a fellow forum member set up his dual MFW-15 Turbo subs in his dedicated theater room. As the former owner of these subs when they were "stock" all I can say is what a difference! Any owners out there with these subs that is hesitant to purchase this kit, I highly recommend it.
sandbagger

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Reply with quote  #43 
Glad everyone is enjoying the Turbo Kits,  and am finally into a few people that post on the forums.  Seems like there for a while everyone that was receiving them were those who didnt frequent the forums.

As for the turn on pop, as Mark said, its nothing to be concerned about.

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Kevin
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patmacav

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Reply with quote  #44 
Quote:
Originally Posted by DTMIKE
Had the pleasure of helping a fellow forum member set up his dual MFW-15 Turbo subs in his dedicated theater room. As the former owner of these subs when they were "stock" all I can say is what a difference! Any owners out there with these subs that is hesitant to purchase this kit, I highly recommend it.


That's good to know, Mike. I've read some of your posts over at AVS about your CS 18.2 sub. I realise all rooms are different and there are so many other variables, but still, how would you compare these turbos to your CS sub?
DTMIKE

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Reply with quote  #45 
Quote:
Originally Posted by patmacav
Quote:
Originally Posted by DTMIKE
Had the pleasure of helping a fellow forum member set up his dual MFW-15 Turbo subs in his dedicated theater room. As the former owner of these subs when they were "stock" all I can say is what a difference! Any owners out there with these subs that is hesitant to purchase this kit, I highly recommend it.


That's good to know, Mike. I've read some of your posts over at AVS about your CS 18.2 sub. I realise all rooms are different and there are so many other variables, but still, how would you compare these turbos to your CS sub?

Like you said without having them in my room it is hard to say. I know what the stock MFW's sounded like and how they performed in my friends theater room and with the turbo mod the difference is incredible. The room is upstairs so a "floating" floor and now all the seats and risers shake as if buttkickers were installed underneath them. Even driving them to insane levels there was no bottoming or bad noises emitted. Kevin and Seaton sound have produced a winning combination IMO, I know my friend is very happy with the results.
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Reply with quote  #46 

Thanks Mike.

I hope you don't mind if I ask one more question here. I seem to recall reading some perceptions that the CS 18.2 was exceptionally impressive in the way it handled multiple low frequency harmonics, enabling differentiation of several simultaneous low frequency sounds, attacks, and decays in ways you hadn't heard before. Did you get a good enough listen to your friend's turbos to form an opinion about how they perform in this regard?

Thanks again for your feedback.
It is greatly appreciated.

Pat

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Reply with quote  #47 
Quote:
Originally Posted by patmacav

Thanks Mike.

I hope you don't mind if I ask one more question here. I seem to recall reading some perceptions that the CS 18.2 was exceptionally impressive in the way it handled multiple low frequency harmonics, enabling differentiation of several simultaneous low frequency sounds, attacks, and decays in ways you hadn't heard before. Did you get a good enough listen to your friend's turbos to form an opinion about how they perform in this regard?

Thanks again for your feedback.
It is greatly appreciated.

Pat


Don't mind at all Pat. In order for me to accurately answer your question I would have to have the Turbo's in my own room and properly set up. If you are a current owner of a stock MFW and know it's limits then you could easily double that with the mod. The CHT 18.2 sub is a very powerful dual opposed 18" driver sub that uses drivers that excel exceptionally well in the "chest slam" bass region and at the same time digs low, room dependent of course. It comes down to the classic ported sound vs sealed where it is all mostly about personal preference. I will wait until his subs open up a little more with some playing time and give them another listen.
nolie

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Reply with quote  #48 
My MFW-15 amp just died.  I don't need the power of a turbo and would be happy with a V3 amp but it looks like I don't have good options except turbo-ing my MFW or buying a new one.  At the cost of new amps, the turbo option is looking decent.

I know many aren't worried about asthetics and it's probably an odd question but am I going to have any issues powering this driver from an amp tucked away in a nearby piece of furniture?  How large is the amp itself and how much heat does it generate?  I'd like to keep my space looking clean if possible.

If my current MFW-15 worked fine, do you agree with this approach or should I go with a new sub?

Thanks for the advice.  I appreciate what you have done for old AV123 owners left holding the bag.  You've done a good thing.
sandbagger

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Reply with quote  #49 
Nolie

As long as you dont put the amp inside a cabinet and close the doors you should be fine.  if the back or at least the front of it sitting on a shelf is open you should not have any problems

The amp does not create a bunch of heat but can get warm with heavy use at loud volume levels.

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Kevin
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Reply with quote  #50 
Just want to chime in and say the turbo upgrade is awesome. I turbo'd 2 of my MFw's and it was a great decision. One turbo'd MFw is even better than 2 stock. The only change I had to make was to not place the amp on top of the sub. This created vibration sounds from the amps that were very annoying. But all is well since I relocated the amps. Just want to thank Kevin and mark for this option and will be looking to upgrade my 3rd mfw in the near future.
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Reply with quote  #51 
Just wanted to let everyone know that the Turbo Kits are in stock and ready for order.
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Kevin
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waynew

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Reply with quote  #52 

Still loving my Turbo!  Here are a few pics:


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Reply with quote  #53 

Well.. finally got my first Turbo kit this afternoon. Thank you Kevin, for working out the logistics with me. I really do appreciate what you did. I know you're enjoying the Axpona just now and all it has to offer, so have fun. Very nice kit. Well packaged and put together, and a big thank you to You and Mark Seaton for all you've done to maximize the design of this box, which is no slouch to begin with.

I have 4 MFW 15s and may Turbo them all over time. I've been very fortunate with my MFWs, but for one early amp replacement and a pesky ground loop hum in my HT room, they've held up rather well over time. Maybe that's because I set the MFW amp gain at 10 o'clock and no higher and only stepped up the LFE from my AVR about 2 DB hotter then what the MCACC settings call for. I've always had plenty of bass that way and except for the occasional weird noise now and then, caused by some extreme LFE in some of today's Blu ray and DVD mixes, they've functioned fairly well within their limits.

I figure once they're all turboed, I'll likely find another use for the drivers, but eventually the amps will become available for some other lucky MFW owners out there that haven't had as good luck as I've had with mine. This first amp out, actually looks good upon visual inspection and it's not been turboed or replaced because the amp was bad. It's just being done because I want to see if you've built a better mouse trap and a safer sub. I'll get back to you all, after it's been running for awhile and hopefully then again after I've done some better tuning and calibration than the minimal effort I've put into my system thus far.

My system consists of Maggie 3.6R mains and IIIa surrounds driven by a VSX 59TXi AVR as a pre into Emotiva XPA1s on my mains with the surrounds driven by the AVR. My source is primarily the OPPO BDP 95, which is a very nice piece. The AVR and Maggies I picked up used and everything else was new. Eventually I need to do some work on the TT end of things, but all in due time.

I've taken everything apart and installed the back plate gaskets on this first Turbo and just took a break for some dinner. I'll let it sit over night for now while I meditate on the instructions for how to install the new driver properly. Everything is straight forward so far and has gone without a hitch.

More to follow later.

patmacav

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Reply with quote  #54 

Well, I got 'er done. I did have one major gaffe in this little project. I should have gone to bed when I first thought about it instead of trying to wrap things up late last night, but no.. instead I finished it up and missed the fact that the fiber glass cabinet filler was still sitting on the floor next to the cabinet instead of inside the cabinet where it belonged when I was done.

Oops.  

Oh well..  today was another day and I just did a little undo and redo. Always a pleasure being humbled by the little mistakes in life.

Oh.. and one other thing. I used one of the 1/8" rubber washer spacers along with plastic spacers provided in the kit that is used to replace these rubber washer spacers to obtain some clearance between the driver surround and the cabinet face plate. Although I did my best to center the driver in the cabinet hole (seriously it was pretty well centered), the cabinet face plate hole was almost touching the surround while the opposite side of the driver surround had about 3/16" clearance. Adding the 1/8" rubber washers provided a minimum of 1/8" clearance. Somewhere on the install thread it said not to do this, but it seemed like the right thing to do in this case. 

I'm letting it play for a while now. Before anything else, the first thing I did was recalibrate my system with the sub using my AVR's MCACC. It had never set my sub at +8 db hot before today. It's always been set at negative whatever. I'm thinking that since neither the amp or driver ever had any kind of signal sent through them prior to the calibration process, they may need a little break in to loosin things up a bit. Then I'll recalibrate again later. More later..

sandbagger

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Reply with quote  #55 
Pat

Sorry about the missed phone call earlier, I was passed out.  I had a 102F fever last night by the time I got back from the Axpona show in Chicago. 

As for running 2 drivers off a single amp, I wished but the amp will not like the 2ohm load.

No problems adding the rubber spacer, the surround actually will get smaller and pull away from the face plate with movement in either direction.

You dont mention where you have the gain on the turbo amp but since your processor set it at +8 I would bump it up a bit to get the processor down around a zero.   You should also make sure you have the PEQ set to about zero unless you know there is a place were you need to pull down a peak.

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Kevin
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Mark_Seaton

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Reply with quote  #56 
Adding to Kevin's comment about the volume, remember that volume knobs have no relation from one amp to another.  So the correct setting for one amp can be dramatically different from another, and I do believe that is the case between the MFW amps and the Turbo amp where you will want a higher setting on the Turbo amp.  In the end this gives you much more fine adjustment of the volume.
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Mark Seaton
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Reply with quote  #57 

Kevin,
No problem at all. Sorry to learn about how you're feeling. Hopefully you can get some rest. You had a really long weekend with lots of drive time and that can wear a body down, not to mention all the people.

About the gain, I started it at 10 o'clock, I just bumped it to 11, we'll see what that does. Makes total sense to adjust it to the point where the AVR will set it at about zero. I think the trouble with the original amps started when you set the gain much over 11 o'clock or so. I know I've kept mine all set at 10 and never had a problem. I am running the Turbo next to the original MFW so I still have two subs. The initial run was just with the new Turbo alone set at 10 o'clock with both the driver and amp new out of the box. I just recalibrated to about zero with both subs running and the Turbo amp gain set at 1 o'clock. The EQ level is at zero. Thank you both so much. I hope you're feeling better soon Kevin.

micah3sixty

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Reply with quote  #58 
I have a 2008-ish original MFW-15 and wonder how long these turbo kits will be available as I may not be able to snag one of these for a year or so.  I haven't had any problems with the original amp or driver, but have been intrigued by the reviews of the turbo kit.  Also, I wonder how the MFW-15 with turbo would work in outdoor capacity, such as for backyard cinema etc.  Thanks!
Dweiner

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Reply with quote  #59 
So I received 3 turbo upgrade kits. All I can say is WOW. I HAVE 9.2 surround sound home theatre system and this upgrade made watching movies fun again. The punch in the new upgrade is just outstanding. It was a very simple job to replace and would recommend to anyone. My room is sound proofed but yet my kids told me the house was vibrating everywhere.
David.
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Reply with quote  #60 
MWF-15 (x2) plus x-tatic and x-voce owner since January 2008.

Just last night I got the buzz indicating one of my 15s has died.

You that have turbo'd, is it better than a new sub purchase?

Thanks,

Doug
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