Latest Speaker Combo in a Test Cabinet - feedback requested . . .

[Steve Lee]

*( This post is Revised with Post #7)

Hey guys,

I have the 1.15 Cu ft cabinets built and the bare 1" thick baffle constructed now and have decided to combine the following drivers but before I start cutting holes and mounting them I wanted to get some input from those more experienced - driver spacing between the tweeter and Mid-range dome is my biggest concern . . .

OK, Here we go:

Cabinets are 8" wide, 13" deep and 32" tall - internal volume = 1.15 cu ft.

Woofer = https://meniscus.lightningbasehosted...20PFC30-04.pdf

Mid-range Dome = http://www.madisound.com/store/manuals/dmba.pdf

Tweeter = https://meniscusaudio.com/wp-content...Data-Sheet.pdf


Imagined Cross-over from Woof to Mid is around 800 ~1.2khz, Crossover from Mid to Tweet is around 6 ~ 7khz.

Woof is 92db, Mid is 92 db and Tweet is 91 db.

All are 4 ohm-ish drivers.

I am thinking of doing this with steep slopes (LR4+) via DSP initially to find target curves after break-in then develop passives for integration later.

Multiple subs will be employed for the lower octave (below 60hz) and the primary application will be music in a small dead space. (300 sq ft).

Any thoughts or direction offered would be appreciated.

[DeZZar]

Ported?

Not so sure about the hivi mid. I mean, it doesn't appear to be capable of doing anything that say an SB29RDC tweeter can't. If you have to cross it above 1K (which it looks like you need to) then you aren't really gaining much, as in you you are still pushing the 8inch into the range you would expect from it in a two way. The SB29 can cross just as low (in fact has a lower FS) and still has a range that extends out to 40K.

Its entirely possible the SB20PF partially compensates for its own baffle step with a slow decline in response about -5db from 300hz through to 1K. Once measured on baffle it could very well meet up with either the chosen midrange or an SB29 tweeter quite nicely. But again I just don't think you are really gaining anything pushing the woofer above 1K.

I think something like this would go better in between https://sbacoustics.com/wp-content/u...MNRX2-25-4.pdf

Just my two cents :D

[Steve Lee]

After further consideration I see your point more clearly - I need to XO the woofer lower to a conventional cone mid at around 200hz . . .

[Steve Lee]

DeZZar, I'm just trying to use drivers that I have on hand and yes it will be a ported design.

The SB21 Tweeter is flatter than your suggested SB29 tweeter above 10Khz as well and I really want to play around with a three way config so I can learn more about the application.

The 8 inch Woofer would ideally be crossed at or below 800hz over to the HiVi Mid Dome.

So, lets just for fun think about what can be done with the chosen drivers and how best to use them?

Thanks for you your thoughts - I'm not discounting them at all - just want to experiment with what I have - if it sux, I can reconfig later . . .

Thanks, mate!

Steve.

[Steve Lee]

I do have a Faital Pro 5FE120-8 pair available but doubt the SPL is going to work but I could be wrong?

https://faitalpro.com/en/products/LF_Loudspeakers/product_details/index.php?id=401010110

[Billet]

I would begin by putting the mid where you want, it will be playing the most critical part of the musical range. I like to offset my mids and tweeters slightly to one side to minimize diffraction effects.

[rpb]

The tweeter has a very strong off axis response, which means it will be picky about the baffle. I'd mount it on a test baffle, and run a few sweeps. Large round-overs would be my preference.

[Steve Lee]

I really hadn't considered the high level response at 60* off-axis in this light before - now DeZZar's suggestion makes more sense - thanks - I learned something.

[Steve Lee]

OK, after taking all comments into consideration , here are the updated speaker selections for this combo from my available inventory in the same cabinet as the OP:

Woofer (same as OP) = https://meniscus.lightningbasehosted...20PFC30-04.pdf

Mid-range = https://faitalpro.com/en/products/LF...p?id=401010110

Tweeter = https://www.parts-express.com/pedocs...spec-sheet.pdf

Comments welcomed.

[rpb]

*( This post is Revised with Post #7)

Hey guys,

I have the 1.15 Cu ft cabinets built and the bare 1" thick baffle constructed now and have decided to combine the following drivers but before I start cutting holes and mounting them I wanted to get some input from those more experienced - driver spacing between the tweeter and Mid-range dome is my biggest concern . . .

OK, Here we go:

Cabinets are 8" wide, 13" deep and 32" tall - internal volume = 1.15 cu ft.

Woofer = https://meniscus.lightningbasehosted...20PFC30-04.pdf

Mid-range Dome = http://www.madisound.com/store/manuals/dmba.pdf

Tweeter = https://meniscusaudio.com/wp-content...Data-Sheet.pdf


Imagined Cross-over from Woof to Mid is around 800 ~1.2khz, Crossover from Mid to Tweet is around 6 ~ 7khz.

Woof is 92db, Mid is 92 db and Tweet is 91 db.

All are 4 ohm-ish drivers.

I am thinking of doing this with steep slopes (LR4+) via DSP initially to find target curves after break-in then develop passives for integration later.

Multiple subs will be employed for the lower octave (below 60hz) and the primary application will be music in a small dead space. (300 sq ft).

Any thoughts or direction offered would be appreciated.

I like the idea of the dome mid. I'd test it, and the tweeter on the baffle with facets, or large round-overs.

[Steve Lee]

RPB - The cabinets are squared-off and cannot accept deep cut facets (Its always something . . .) nor heavy round-overs.

How about thick felt strips vertically on either side of the tweeter and mid-dome?

I guess I could test this on a board the same width as the current baffles . . .

[rpb]

I've used square edges many times. I'd measure, and see how things look.

[Steve Lee]

OK, I will put these nice baffles fresh out of the planer aside and make test baffles out of Advantech, mount the original (OP) drivers then get into the electronics/programming side [Sigma Studio] of this mess as a project/test.

Thanks for the encouragement. (Gosh, there are so many variables in this hobby . . .)

:D

Steve.

[Steve Lee]

I remember in the early 80's having a pair of soft dome mids from Radio Shack that just amazed me and they were tight and clean to my young ears when crossed with a single capacitor and now that I am looking critically at FR data charts I cannot logically see any application for them.

No woofer integrates with them from a technical perspective so they seem useless like a solution looking for a reason to exist.

OK, with that said , I will make two new speaker loaded baffles - one with the HiVi DMB-A mid and another using the Faital Pro 5FE120 - tweeter yet to be decided upon.

My ears will be the deciding factor - FR sweeps are just reference.

[Steve Lee]

I've decided to try the HiVi RT1.3WE Ribbon tweeter for this project crossed around 6 Khz --> https://www.parts-express.com/pedocs...spec-sheet.pdf

[davidB]

With a ribbon, which wants to be crossed well over 2k, you now have a good use for the dome mid(whch is really a low tweeter, listen to a 1k tone, it's at least on the border between mid-and-high ranges, if not to you a high note).

Think of it as a woofer, large tweeter, and supertweeter setup.

[Steve Lee]

My brain keeps telling me to make this a 4-way . . .

:D