New SI BM information

[Electrodynamic]

Here is an excerpt from the newsletter I sent out recently:

In this newsletter I will outline what is happening to the BM series subwoofers. First and foremost almost everything is changing except the size of the voice coil and the shape of the basket. Other than that, everything is being improved.

The cone/diaphragm has been changed to a two-piece patent-pending design that is more rigid than anything else on the market while maintaining an ultra-shallow profile. The surround has been changed to a normal roll surround. The basket will be painted Lexus metallic white with all of connectors/fasteners being black chrome. The spider is an improved, but still massive, 10" nomex weave. And last but not least the motor is being changed to a 10 disk neo ring that not only improves BL but also makes the unit ~5 lbs lighter. And of course the shorting ring is still being implemented to lower and maintain inductance over stroke which will provide un-paralleled transient response in shallow subwoofers.

All of these changes are only going to push the start of production back another 30 days. The changes are worth their weight in gold, as the new BM's will now be the highest linear stroke, best performing, best sounding, best looking drivers in the shallow subwoofer arena.

Here are a few pics of the mkII (not the final version):

Here you go:






And here are renderings of what the BM's motor is going to look like:

[BeatsDownLow]

so 30 days and they are shipping?

[AndyInOC]

THAT is a very impressive shallow mount

[Inferno333]

Me likey!

[Electrodynamic]

Originally Posted by BeatsDownLow

so 30 days and they are shipping?

No, it's just pushing production back another 30 days. I'll let you guys know the process though.

However, signing up for our newsletter is the quickest way to get the most up to date information.

[thehatedguy]

That's a good looking shallow woofer.

Having just got a Black Onyx IS300, BO would be a sexier color than WDP.

[Boostedrex]

Looking forward to seeing/hearing that sub in 2 days from now Nick. Looking nice though.

[mSaLL150]

Put me down for 2 of them!

Is the new motor going to change the depth at all, or are we still looking at ~3.5" mounting depth? Will the changes affect the original .5cu ft airspace recommendation?

[Electrodynamic]

The motor changes won't affect the depth at all. Overall mounting depth is still going to be 3.5" but when mounted on a piece of wood that is 3/4" thick it only needs 2.75" of internal depth. The depth won't change at all because the motor is inside the basket even though the motor is a mm or two thinner. And yes, the enclosure size is still going to be 0.5 ft^3 sealed.

[dawgdan]

any rough ETA for this? I saw the pushing production back another 30 days comment.

[Boostedrex]

Originally Posted by Electrodynamic

The motor changes won't affect the depth at all. Overall mounting depth is still going to be 3.5" but when mounted on a piece of wood that is 3/4" thick it only needs 2.75" of internal depth. The depth won't change at all because the motor is inside the basket even though the motor is a mm or two thinner. And yes, the enclosure size is still going to be 0.5 ft^3 sealed.

And I don't know if it has been asked or not Nick, but how much room do you need to leave between the back of the sub and the rear wall of the box? Any pole venting space needed?

[Electrodynamic]

Originally Posted by Boostedrex

And I don't know if it has been asked or not Nick, but how much room do you need to leave between the back of the sub and the rear wall of the box? Any pole venting space needed?

The new motor parts are being sourced and tooled, so we don't have an ETA for them yet. When we do, it will be released in one of our newsletters.

Technically you don't have to leave space behind the pole because the pole sits about 2mm in from the very back of the driver. However, for optimum performance, I would leave 1/4" behind the driver, which would make the internal box height an even 3".

[Riveted1]

I've been waiting for these things to come out since you first announced them. Man it's been a long wait! But I'm glad you're taking the time to make sure it is right. I'm just not so sure about that white color....

[Electrodynamic]

Originally Posted by Riveted1

I've been waiting for these things to come out since you first announced them. Man it's been a long wait! But I'm glad you're taking the time to make sure it is right. I'm just not so sure about that white color....

No one's sure about any color. No matter what color I say the basket is going to be painted, people always want something different. If it's black or grey, it's too normal. But if it's another color, it's not the right color. I want white, so that's what you're getting.

[Boostedrex]

Originally Posted by Electrodynamic

Technically you don't have to leave space behind the pole because the pole sits about 2mm in from the very back of the driver. However, for optimum performance, I would leave 1/4" behind the driver, which would make the internal box height an even 3".

Now that's what I'm talking about! Nice!!

[Electrodynamic]

You guys will get to play around with the mkII (the one pictured) at the meet. I'm building a box for it tonight so we can shove it in anyone's vehicle who wants to hear it.

[mSaLL150]

Originally Posted by Boostedrex

Now that's what I'm talking about! Nice!!

x2! Awesome space requirements. These things really will disappear in my truck (no pun intended ).

Originally Posted by Electrodynamic

You guys will get to play around with the mkII (the one pictured) at the meet. I'm building a box for it tonight so we can shove it in anyone's vehicle who wants to hear it.

If you guys get a chance, toss it under the backseat of ARCuhTEK's F150 and see how it sounds placed there. I have the same exact vehicle.

[Riveted1]

Originally Posted by Electrodynamic

No one's sure about any color. No matter what color I say the basket is going to be painted, people always want something different. If it's black or grey, it's too normal. But if it's another color, it's not the right color. I want white, so that's what you're getting.

Ya I understand. Opinions are like assholes. It just seems like black or grey is more universal. Mine will be hidden anyway, so I guess it won't really matter

[Electrodynamic]

I just listened to the little sucker in 0.5 ft^3 for an hour. The result was really good - it sounds exactly like I anticipated it to sound. I'll post more on how it sounds later on because I'm super tired right now.

[BeatsDownLow]

do you have a price point for these?

[Electrodynamic]

Not yet.

[el_chupo_]

Nick, any T/S specs we can ogle over?

[Electrodynamic]

Nope. Sorry guys.

This isn't the final version, so the T/S's will be significantly different on this unit than the final driver. You guys won't like that it doesn't reach a .707 in the recommended box anyway (even though Qtc means d*ck in a car as long as it's below a 2.0 (2.0 is where you start hearing differences) - the only thing you should be concerned about is the F3 in the target enclosure). As long as the F3 is ~ 50'ish Hz, you're golden due to the 12 dB / octave gain you get in a car compared to the 12 dB / octave loss you have with a sealed box. The end result is a flat response down to 20 Hz. But anyway, this version is substantially different than what the final version is going to be. We're literally re-tooling the entire motor including the switch to neo over ferrite, which will shift the parameters quite a bit.

[VP Electricity]

You look at Joseph's/Earthquakes' patent on "flat" woofers? Any design-arounds?

[DS-21]

Interesting. 12 only or any plans on doing a 10 as well?