Electrodynamic

A new 12" Mag will not be able to keep up with a 15" Mag. Due to surface area alone the 'battle' was over before it began. A 15" driver will whip the 12" driver in output. Two 12's vs. a single 15" is a much more fair comparisson.

We actually do have a few 15" Mag's left. On the note of two 12's weighing more and taking up more volume - have you read the posts about the new Mag? Two new Mag's are going to weigh less than a single 15" and the two 12's will require a smaller enclosure than a single 15 (which, again, reduces weight due to the smaller enclosure). Two new 12" Mags need 1.5 cubes total. A single 15" Mag needs 2.5 cubes. It's a win-win situation IMO. Less weight, more bass.

Because I've made it better. The previous model was a result of my desire to keep improving on an existing design. So far the Mag's have been through 2 substantial revisions. If I would have sat back and left the original design alone, the Mag would have never evolved - it would still use a TC9 motor with a less-than-adequate basket. Every time I've re-designed the Mag it has gotten more efficient, plays a little lower, and sounds a little better. This time is no different.

They can be tuned anywhere from 32 to 38 Hz in 2 ft^3 or larger, and since he has plenty of room, tuning to 32 shouldn't be a problem. You are right though, I was thinking Mag's (tuned at 32 Hz), but the BM's are tuned at 34 Hz.

2 ft^3 tuned to 32 Hz after port and driver (a single 12" BM displaces 0.1 ft^3).

The new Mag's will only be available in a 12" size. In the other thread here I posted about it.

Nope, the face will be similar to the current Mag. It will have a "boob" dust cap on it, paper cone, and foam surround with a rubber gasket. It will look slightly different, but will retain the same overall look.

The new Mag's are only going to be available in a 12" size. Minimum is looking to be 1.37 ft^3 (although we will publish recommended) and recommended ported enclosure volume is looking to be 1.5 ft^3. Ported enclosure specs for the current Mag 12 and 15 can still be found on our web page: http://www.stereointegrity.com/mag.php

At this point, no. The new Mag can do everything the current Mag can do except better...except soak up an overabundance of power. The new Mag's just won't handle 1800+ watts like the current Mag's do...because it's not needed.

Haha, soon man....soon.

What size and how many BM's do you have? Also, how much room do you have available to give up to your sub(s)?

The first graph in this thread is sealed and the second and third graphs (the ones you posted) are ported. I edited my post to reflect that the graphs are ported (thanks for pointing it out).

^ Exactly. 9 cubes and 6 cubes. Massive massive massive boxes with a TON of power!!! Here are the graphs of ported cone excursion for the 12W7 in its recommended 1.75 ft^3 enclosure with 1000 watts and the new Mag in 1.5 ft^3 with 1000 watts. Cone excursion goes over 40mm total when you get about 10 Hz below tuning (you should have a subsonic filter on your system with a ported enclosure to avoid sending your system something that low anyway). Here is the graph of the same thing but with 800 watts: Notice the similarities and differences? Note that excursion only becomes an issue below tuning. At/above tuning, both drivers are moving less than 32mm total with 1000 watts. Now why spend all the extra money and have all that extra weight for something that you're never going to use (ie. 30+mm of one way excursion)? Not to mention that the Mag is still going to hold its T/S's more constant and have less distortion and lower inductance than a driver that can do 25+mm one-way anyway.

Qts is going to be in the mid 0.4's. 200 watts per driver IB would over a bit overkill, but we'll see when we start testing more.

The new BM's and the new Mag's can be used IB. But as you know, power handling goes WAY down when using them IB. I would only use the new Mag's for IB if you were dead-set on that alignment due to how low the power handling would be on the BM's when IB'd. But then again, if you were only shoving a couple hundred watts to each BM you could use them.

Exactly. I'll post more fun graphs later this week. Oh, I'll post up ported excursion plots with certain input power also.

If you have an enclosure larger than 1 ft^3, a Mag is still the right choice if you're after a subwoofer with phenomenal SQ and great output. Power handling will go down a tiny bit every time to go larger and larger over the target box volume (which is the way it is for any sealed alignment). The Mag will also work extremely well in small-to-medium sized vented alignments. The other thing to consider is that even though I demonstrated the Mag in 1 ft^3, its .707 alignment is in less than 1 ft^3, so you could use two Mag's in the same space as one other driver.

Some of you have seen pics or drawing of the new Mag's basket and read about its shallow 5.5" of mounting depth. You might have also heard about the super-small enclosure requirements. As much as I love my current Mag 12's, and love beating the absolute piss out of them, I have also given a lot of though as to the design in general. The current Mag (the one's we are sold out of) are a decently efficient, are extremely versitile, and have the ability to soak up a LOT of power. That last sentence has a key word in it - soak. I can count on one hand how many times I have bottomed out my pair of Mag's with a 3200 watt amplifier, two big batteries, and an HO alt. And even then, I did it on purpose. Now, I want everyone that has downloaded a copy of WinISD (can be downloaded for free at www.linearteam.org) to do the following: Load any 12" subwoofer and put it in 1 cubic foot sealed. Put the input signal at 1000 watts. Pull down the toolbar and take a look at excursion. You won't see the excursion plot go over 38/40mm of total travel. ...yes I used WinISD, but I used it because it is free and it works very well to show cone excursion per given application. What people are failing to realize with most super-subs is that they are paying for something that will never use. Sure you might have 27-30mm of one-way travel, but how much of you are actually using that travel? Also, how much power does it take to get to 54-60mm of total trave in 1 cubic foot sealed? Do the homework in WinISD and you'll be very surprised. That is why the new Mag's and BM's have been totally re-designed. In practical applications, you aren't getting your 12" subwoofer to move over 20mm one-way with 1000 watts in 1 cubic foot. So why pay for all that extra weight and inefficiency if you don't have to? Not to mention the fact that a "super-sub" is almost always 6.75" or more deep. I have attached a screen shot of the excursion plots for the JL 12W7 and the current SI Mag 12 (the one's we are sold out of) in 1 ft^3 sealed with 1000 watts of input. The JL is the yellow plot, the Mag is the orange plot. Notice how much cone excursion is going on above 20 Hz. The verticle plane is total excursion in milimeters and the horizontal plane is frequency.

Thanks man.

The new BM's will be super-happy in sealed enclosures. They will perform extremely well in 0.75 cubes sealed. The new BM's are a complete new, unique driver - its only similarity to the prototype driver that we are not making is power handling...but that's about it. But yes, they will slaughter the previous model of BM's in a sealed alignment.

The basket will help with heat-sinking, but again, the new Mag isn't going to be able to soak up gobbs of power like the previous generation. As of right now there is no plan for a pre-order, but things could change.

This is the basket only, the finished driver will look much better due to the plate on the back and all the soft parts installed.

As most of you may know, the BM's are going ultra-shallow! Ultra-shallow being 3.5" for a 12" model. The new BM will be offered in a 12" only with dual 4 Ohm coils. Enclosure sizes are 0.75 cubes sealed and 1.5 cubes ported. Power handling will be 500 watts RMS. That's all the information I'll let out for now, but here is a picture of the basket we are going to use (and before anyone asks, this may or may not be the color of the basket )

11 and 1/16'th

Cool, thanks for the update with the drawing! Pretty impressive if I do say so myself. I wish there was an audio society where I went to college.