As most know, I was the designer of AV123's very popular, MFW-15 subwoofer. As many also know, AV123's push to ever lower prices resulted in component quality issues in the amplifiers beyond the first ~300 units which have performed very well on average. The amplifier was custom fit to the enclosure to allow the very large, low-tuned port to wrap up the back of the box forming a full C internally while using large round-overs on both ends of the port. As such the common DIY outlets do not offer amplifiers which can fit in the cabinet.
With so many failed and thousands sold, I have long wanted to offer a drop-in amplifier to both fit the original cabinet, and to implement many of the refinements I wanted in the original and intended to include if a 2nd generation was ever released. Over the past few years we have been working with our amplifier OEM, SpeakerPower, based out of Santa Ana, CA, to develop a modern, home audio specific input/control front end. You can already see this in our new HT series amplifiers for the SubMersive HP+/F2+ and F18+. Combined with ICEpower's most recently updated amplifier modules, we are able to easily pack greatly improved amplifier performance along with full-featured audio processing, controls and adjustments. I have made the investment in the custom parts required for the first 100+ amplifiers to allow a drop in, amplifier upgrade, and can now offer them in the 3 forms you see here on our forum. We have quite a few new old stock MFW-15 cabinets fully loaded as MFW-15 Turbo models. We also offer a whole-sale Turbo Upgrade for MFW-15 owners to replace the woofer and amplifier for about double the performance with significant improvements in sound quality. This upgrade will also greatly reduce the likelihood of hearing any foul noises from your MFW-15 if a soundtrack pushes the upper performance limits.
Upgrade your original MFW-15 to a 700W (conservatively rated) ICEpower amplifier with custom DSP programming by the original designer of the MFW-15, Mark Seaton. The new amplifier drops directly into the amplifier opening and offers both increased clean playback levels, lowered distortion and improved sound quality. The custom-fit amplifier is manufactured for us by the same California based build house as our SubMersive amplifiers, SpeakerPower, and comes with a 3 year warranty while being serviceable long after that time.
Pricing for the upgrade is $450 + $15 shipping within lower 48 states.
- 700W RMS ICEpower amplification
- XLR/RCA inputs with auto-sensing and 12V trigger
- LF EQ for room size and house curve adjustment
- 30-200Hz 24dB/oct crossover
- 0-20ms delay control for front/rear subs
- Assembled in USA - all but the ICEpower module is USA sourced
- Included block off plate for original control panel
- 3 year warranty with the same shipping policies as for our other products (link)
Q) How can I order the Mk2 amplifier?
A) Please e-mail us ( firstname.lastname@example.org ) to confirm the quantity Mk2 amplifiers you are ordering, your shipping address, and a contact phone number we can provide FedEx so we can send on the appropriate invoice. We have settled on a flat rate shipping of $20 for the amplifiers within the lower 48 states.
We e-mail invoices hosted by PayPal. You can either pay with a PayPal account or if the invoice goes to an e-mail that is not tied to a PayPal account, you can select "pay without logging in" and pay with any major credit card (for any order less than $2000). If those options don't work out for you or you prefer to process are card over the phone, simply give us a call at 773-290-8436 and we can process your credit card over the phone.
Sending us an e-mail with the shipping and contact info is much quicker and more reliable than taking it down over the phone.
As an added bonus, this is the same amplifier we use in the MFW-15 Turbo Kit. This means if an owner wants to later upgrade to the Turbo kit, this is possible by shipping the 5 lb amplifier back to us for re-programmed as a Turbo kit amplifier. There is no cost for the programming, just round trip shipping and the remaining parts for the Turbo kit. Re-programming of amplifiers must be done by Seaton Sound or another party we authorize, equip, and train to do so.
I finally made some time to pull out some measurements from when I was making the final adjustments to the MFW-15 Mk2 amplifier. These were in the middle of the warehouse, so not ideal outdoor measurements of a vented sub, but if you excuse a little wiggle in the response, you can see just how smooth the response is now, and the range of options the "LF EQ" knob provides.
First is a snapshot of a few response curves of the MFW-15 Mk2 with the stock driver. The middle, light blue line is what you get with the LF EQ knob at 12 o'clock. The graph shows 5dB/division, showing a +/-3dB window with a lower limit of 17Hz and useful extension below 15Hz. From top to bottom the curves represent the LF EQ knob at approximately 5, 3, 12, 9 and 7 o'clock on the dial (clockwise is higher). The original MFW had a low end response closer to that of the green curve around 9-10 o'clock on the dial, but not as smooth:
If we zoom in much closer showing only 2dB/division and a much narrower range you can see just how smooth the curves are and the adjustments between the curves. From full clockwise to full counter-clockwise is about +/-6dB (12dB total adjustment) around 16-18Hz, and less than +/-1dB above 60Hz:
Finally here is a graph showing the fine adjustment available as you turn the knob from min to max where the respective colors remain the same but more increments are filled in through the range:
Q1) Should I get the MFW Mk2 amp or wait for the complete Turbo Kit?
A) At this time, I recommend anyone with a working original woofer to upgrade to the Mk2 amplifier and get your system running again while making it perform much better than the original. The Turbo driver we were selling has surround which was larger than the stock MFW driver. This means the cover panel hits the outer edge of the surround and required a 1/2" spacer behind the cover panel to fit. While this functions just fine, it isn't a clean, professional look. Later this year I will have newly developed turbo woofers available which will fit within the original cover panel. These woofers will feature a santoprene surround, dish dustcap, low distortion motor and will be US made by one of our very reliable vendors to insure ready availability once finalized. If you think you may later upgrade your Mk2 amplifier to a Turbo unit just save the packing boxes as they make shipping the 5 lb amplifier very easy and economical. There will be no charge to reprogram the amplifier for the new Turbo woofer, just the round trip shipping to update the amplifier.
Seaton Sound, Inc.