Maurbacs NS6 MTM

[donradick]

Re: Maurbacs NS6 MTM

Don, price always matters it is just finding out what that price means So many variables in a driver cost that have nothing to do with the construction of the driver itself for price to be a reliable indicator, basically just a rough guide.

As always, right on the money. I am definitely into high value designs, but realize more and more how many hours it takes me to do a proper crossover and build a box, so really cheap drivers don't seem as important when considering 30-50 hours of my precious time on other aspects.

[codycr6]

Re: Maurbacs NS6 MTM

If you haven't done any design / build / measure projects from scratch, that's a pretty ambitious project. You will need a 2.5 design to avoid lobing. If you want to play, you might try the MTM crossover, and just use a 1.5 mH on the WWs, or maybe a coil plus 8 uF cap to ground, but you could easily end up with a bump or dip around 400 Hz that would be ugly.

If you build these are as they are designed and high pass them at 80 Hz for home theater use with a sub, they will play very loud. I haven't heard the SAS drivers, so YYMV. Without a sub, they will play pretty loud, but not to "head banging" or "ear splitting" levels.

Have you had any issues driving these speakers? Can you elaborate some on their sound as you built them? I do already run a subwoofer on the low end, I was mainly looking at whether they would be plenty strong down into the midbass region. Measurements and subjective thoughts would be greatly appreciated!

[ryanbouma]

Re: Maurbacs NS6 MTM

Cool! I really outta grab some of those n6s woofers.

What makes you think the 500hz dip is from the room?

It looks like the 800 to 1000hz region could come down with a larger choke..?

[donradick]

Re: Maurbacs NS6 MTM

Cool! I really outta grab some of those n6s woofers.

What makes you think the 500hz dip is from the room?

It looks like the 800 to 1000hz region could come down with a larger choke..?

In many ways, I'm still a n00b about measuring - using ARTA in my small study, I get about 300 hz before reflections (about 46 inches or so from boundaries) - so I know that below 300 Hz is not valid, and I read a comment somewhere that said the gating effects will show in the graphs up to an octave above the gate. OTOH, I designed these with about 3 dB of BSC, so there will be drop from 1000 hz down to about 300 hz, so maybe that's what I'm seeing. I certainly don't hear any lack of output in that range - male voices and such are strong and clear.

I really need to get comfortable in ARTA with doing gated at 1M, nearfield woofer, and port measurements and splicing them. Maybe I need to "bit the bullet" and switch to Holm Impulse, where I can combine graphs easily.

While measuring and tuning the crossover, I did try a 1.5 mH coil versus the 1.0 mH I used in the end. Here is the measured difference:

[donradick]

Re: Maurbacs NS6 MTM

Have you had any issues driving these speakers? Can you elaborate some on their sound as you built them? I do already run a subwoofer on the low end, I was mainly looking at whether they would be plenty strong down into the midbass region. Measurements and subjective thoughts would be greatly appreciated!

No issues driving them, they are a solid 4 ohm design.
Mid-bass is excellent, make voices, guitar, and snare drums sound great - not hollow, or muffled, or chesty. just right.

[ryanbouma]

Re: Maurbacs NS6 MTM

Cool.

An I reading that right, the 1.5mH didn't do anything?

This'll be a popular speaker

[donradick]

Re: Maurbacs NS6 MTM

Cool.

An I reading that right, the 1.5mH didn't do anything?

This'll be a popular speaker

Yah, I was a bit surprised at the 1.5 mH measurements also.

I've gotten probably a dozen requests for a MTM.
The wait was worth it.:D

[LouC]

Re: Maurbacs NS6 MTM

This was my second veneer project, and again I can't say enough good stuff about Titan DX contact cement. No fumes, and holds great. Quarter-sawn Maple veneer. I got some great finishing tips from LouC and others, and used a bit of Transtint medium brown in cut shellac (yes, it really DID pop the grain), with General Finishes water-based Enduro (really good stuff - I've tossed out the Deft lacquer) .

Nice work Don! Maple is a devil to stain. Enduro would be my next choice when I can no longer find my Fuhr 380 (rapidly disappearing from the retail market) Transtint seems expensive, but it lasts forever. With Honey Amber, and Reddish Brown you'll be able to make just about any non exotic dye you want. It even tints white Duratex! (and SealCoat of course) The Titan DX goes a long way too. Now you can troll the Formwood overstock page right after PE buyouts! ;) BTW, Formwood will ship up to 4 sheets for the same price as 1 sheet)

[WernerM]

Re: Maurbacs NS6 MTM

I like IT! Do you have an estimate on the final cost, minus the cab since you already had it?:p

[donradick]

Re: Maurbacs NS6 MTM

I like IT! Do you have an estimate on the final cost, minus the cab since you already had it?:p

Drivers per side are $20 woofers, $17 tweeter = $37, crossover is about $25 each side, so about $120 or so. They sound reallly good! Some folks said they were going to build them, so hopefully I'll get some objective feedback.
I worked hard to simplify the crossover, and really proud of it.

[donradick]

Re: Maurbacs NS6 MTM

Due to numerous requests, I have finally modeled a small tower for this design.
Something like 9 1/2 W x 42 H x 14 D will net you about 2 cubic feet after bracing.

The bext tuning I can do is F3 43Hz, Fb 51Hz, using a 3 inch port (I use PVC SCH40)
that is 3 CM (1 1/2 inches) long. (That's with a 2 db bump at about 100 Hz)

One of the problems with using a MTM design this way is that the tweeter will end up a bit low.
It looks like it will be about 33 inches off the floor.

[WernerM]

Re: Maurbacs NS6 MTM

Due to numerous requests, I have finally modeled a small tower for this design.
Something like 9 1/2 W x 42 H x 14 D will net you about 2 cubic feet after bracing.

The bext tuning I can do is F3 43Hz, Fb 51Hz, using a 3 inch port (I use PVC SCH40)
that is 3 CM (1 1/2 inches) long. (That's with a 2 db bump at about 100 Hz)

One of the problems with using a MTM design this way is that the tweeter will end up a bit low.
It looks like it will be about 33 inches off the floor.

Would only be bad for standing I think. Would work for me, as my ear is at about 31" when seated in my fav easy chair. Or you could male some radical and tall feet!!! :eek::D:p

[greywarden]

Re: Maurbacs NS6 MTM

Due to numerous requests, I have finally modeled a small tower for this design.
Something like 9 1/2 W x 42 H x 14 D will net you about 2 cubic feet after bracing.

The bext tuning I can do is F3 43Hz, Fb 51Hz, using a 3 inch port (I use PVC SCH40)
that is 3 CM (1 1/2 inches) long. (That's with a 2 db bump at about 100 Hz)

One of the problems with using a MTM design this way is that the tweeter will end up a bit low.
It looks like it will be about 33 inches off the floor.

I'd say the tweeter 33 inches up is about perfect when you're sitting down on a couch or whatever, but I am 5ft even lol.

[WernerM]

Re: Maurbacs NS6 MTM

This idea for a tower stuck in my head this morning... Don I had a thought for the height... Earlier I suggested radical feet, what about a radical base??? Here is what I mean, stay with me on this...make a seperate 3/4" plywood/MDF base, not to be confused with the bottom of the enclosure. Use supports like dowels or something to raise the cab about 3" from the top of the base, now you have a 3" air gap between your base, and the base at the bottom of the cab. Now instead of mounting the port on the back or front, you have the option of a bottom mount with the available air gap. This would be kindof like a down firing sub. Not saying it would have the same effect, just trying to give as much of a description as possible. What do ya think about this idea???

[greywarden]

Re: Maurbacs NS6 MTM

The Statement does something like that, but it's also much taller, and the tweeter's mounted in the center...