DIY M19 idea's

[GM]

Well, I was considering building a speaker using model 19 componets. The cabinet would be at least one foot taller than the mod 19 and only as wide as the 811b, but with the same internal volume for the 416-8c. I would also use the same crossover values in the n1201-8a crossover.
I was wondering if anyone has ever tried fabricating a 811b out of fiberglass?

A narrower cab will have a higher baffle step, so the XO may not work all that well unless some outboard frequency response shaping EQ is done.

No, and frankly not worth the effort since for far less time/$$$ expended you can tweak the 811s to a fare-thee-well.

GM

[rontec]

A narrower cab will have a higher baffle step, so the XO may not work all that well unless some outboard frequency response shaping EQ is done.

No, and frankly not worth the effort since for far less time/$$$ expended you can tweak the 811s to a fare-thee-well.

GM

Not sure what you mean by a higher baffle step. Couldn't the narrower cabinet's port be tuned for a 416 the same as for a mod19?
A friend offered to make a 811 mold for me, but I haven't given him my 811s from my mod19 to use as a model. (and won't) Although, I have been trying to buy some 811s but everytime they come up on graigslist, I've been too late.
The thought of a narrower and taller cabinet, is that I like the sound stage elevated and I was thinking that the 811s might sound even better from an elevated position. (I guess I could set my 19s on 1 foot blocks and see if there is an improvement!)
The other reason was a smaller footprint and maybe less cost.

[RonSSS]

Guys,

The MR994 is the large CD horn for the small format drivers.
I have a pair and I like them. Larger than even the 511.

I think an M19 clone based on them would be cool.

But with that, the M19 is really a simple bass reflex bottom end, with the 811 horn and a pretty decent crossover. The cabs are way cool looking, but still just a basic BR.

That said, here are my 19's with the 994 on top just to play with.



If a guy had 19's, and wanted to build new tops, you could put this together.

Were I to start from scratch, I'd build duplicates, with ducted ports, use the -8B woofs and the 902-8a drivers.

Would be a fun project.

As it is, I love my 19's as modded. Look ma, no vanes in the 811's! Oh, I said I'd never mention that again....I lied!

Ron

[magnarc]

Guys,

The MR994 is the large CD horn for the small format drivers.
I have a pair and I like them. Larger than even the 511.

I think an M19 clone based on them would be cool.

But with that, the M19 is really a simple bass reflex bottom end, with the 811 horn and a pretty decent crossover. The cabs are way cool looking, but still just a basic BR.

That said, here are my 19's with the 994 on top just to play with.



If a guy had 19's, and wanted to build new tops, you could put this together.

Were I to start from scratch, I'd build duplicates, with ducted ports, use the -8B woofs and the 902-8a drivers.

Would be a fun project.

As it is, I love my 19's as modded. Look ma, no vanes in the 811's! Oh, I said I'd never mention that again....I lied!

Ron

Are you sure they aren't MRII594A's there, the ones that take 288 series drivers?

[GM]

Are you sure they aren't MRII594A's there, the ones that take 288 series drivers?

Hmm, IIRC the only difference between the two expansions is that the 594 is a truncated 994 to create a larger throat same as the 511E Vs 511B, so from the front you're not likely to notice which it is.

GM

[bfish]

Hmm, IIRC the only difference between the two expansions is that the 594 is a truncated 994 to create a larger throat same as the 511E Vs 511B, so from the front you're not likely to notice which it is.

GM

Yep. The MRII594/MR994 share HxW dimensions, and only 7/10" difference in length.



(courtesy Lansing Heritage)

[bfish]

Once you slip a 994 in an ~M19 sized box and add the requisite shaping filter, you begin to notice it's more like an M500/9815/A-15 than an M19 (which isn't a bad thing at all). Then you get to longing for the extra ~octave a 3154 can get you, and you abandon the M19 altogether and build some modified M500s/9815s/A-15s.

All can be done with new GPA components too, save for the MR994...

[RonSSS]

Are you sure they aren't MRII594A's there, the ones that take 288 series drivers?

Nope, these fit the small format drivers.

Ron

[GM]

Baffle step refers to the fact that WLs that are too large for the baffle to support will fall away from it which shows up as a rolled off response, ergo the smaller the baffle the higher in frequency that this occurs. This is usually addressed in the XO's design.

Yes, if the net Vb is the same, then the same vent as the M19's will tune it identically. If the net Vb is less, you can still tune it to the same frequency, but its F3 will be higher.

While conventional wisdom says to put the HF at ear height, I prefer the horn to be a bit above my ears as it's usually the way I hear it at a movie, stage show, etc. and if the HF is highly directional, angled down a bit too.

Anyway, Dan Traina did a very nice looking M19 like you're wanting: http://www.hostboard.com/forums/alte...ml#post1500870

GM

[rontec]

Thanks GM. That's pretty much what I had in mind. (photo) Does your dimensions of 51.25 x 19.5 x 28.5 approximate the volume of a mod19?
I may be picking up a pair of 846u tomorrow. I don't know what kind of shape the cabs are in, so I may end up doing something like the photo. But at first, I'll just raise them up off the floor and give them good listening to.