BIB MOTH Build

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#43
Hey David,

At this years BAF raffle my number won me the Moth drivers! So now there are two of us - "The Burning Moth Brothers". (Sounds like trapeze act.)

I do like the OB design concept. And I like the look of the speaker that Nelson displayed at the RMAF 2007. Did he ever publish any further data on it? Have you done any further work on your Moth project?

Cheers,
Graeme
 
#44
Hi Graeme,

I decided to follow a nice looking design from Martin (MJK) over here: http://www.diyaudio.com/forums/showthread.php?postid=1643653#post1643653

He came up with a very interesting OB full range driver coupled with a large efficient Goldwood GW-1858 woofer in an H-frame. A pair of GW-1858's should arrive here tomorrow afternoon.

One aspect of the design that intrigued me, was the fact that the full range driver sat on top of the woofer H-frame. The design seemed like flexible platform for experimentation with other full range speakers by exchanging only the top baffle. I'd like to build an active passover to further facilitate switching out the FR drivers for experimentation.

The design idea of Martin's caught my imagination.

Let me know the design direction you decide. It will be great to compare notes.

-David
 
#47
moth cicada drivers

Nice to see you develop a more favorable position on these, GM. The last
time I tried to present two pair for sale you published some negative comments
and thwarted me. Your great (and generally well-deserved) reputation on this
forum carries alot of weight!

I have tried these drivers on large OB and they sounded beautiful. If you
don't do heavy material or go louder than 80-85 db they are all you need.

If you want to do 85-90, support them with a sub underneath.

If you want 90-95, cross from a sub (or better yet two subs) at 200 hz
at 24 db/octave.

I have had templates made for both the hole and the flange if anyone wants to arrange to use them for flush mounting. this will save you alot of time

I also have one pair left in good used condition if anyone cares. Now is your
big chance GM.

sundbyd2@comcast.com] david sundby 970-223-3908
 
#48
At this late date I have worked a Moth into the BOB (Big Open
Baffle project - coming any month now!) with very satisfactory
results on the crossover to the Eminence Beta 15 woofer.

The driver compares well with the Lowther PM6C - the
Lowther is a bit more efficient, but the Cicada goes a little
lower and is a bit flatter on the top, and has a 12 ohm
impedance.

It falls short against the more expensive versions of the PM6.

😎
 
#50
mor2bz said:
Nice to see you develop a more favorable position on these, GM. The last
time I tried to present two pair for sale you published some negative comments
and thwarted me. Your great (and generally well-deserved) reputation on this
forum carries alot of weight!

Now is your chance GM.
Click to expand...

Hmm, wasn't aware I'd changed it. Regardless, I just call them like I see them when folks ask, so not remembering what you're referring to, I can only assume that I didn't believe it met the needs of the stated app based on the info I had available to me and apparently you didn't have enough 'ammo' to counter it to make the sale.

As for my interest in them to play with, this latest 'hit' on my retirement fund has taken care of it.

GM
 
#53
Zen Mod said:
he offered to pass Pass's present to me , but I refused , talkin' that I already have enough FRs and know what they are ; he didn't knew at that time )
Click to expand...

Let's expect pictures from Cviller, our Danish - temporary San Franciscan friend, who now inherited Nelson's generous gift. I had Cicadas as OB in my three way system with Lambdas on the bottom and RAAls on the top. Mmmmm, they were awesome there. We have fitted Cviller with Cicadas as his speakers while he is away from home. Let see what he will come up with.
 
#54
If he has issues with the 10 KHz peak, he can use a filter
that I found effective, which is 0.25 mH, 1 uF, and 22 to 100
ohms, all in parallel, this in series with the driver.

At 100 ohms, it knocks the peak flat. Between there and
22 ohms is where you are likely to find the sweet spot.

I also have information on crossing that over in an OB

😎
 
#57
Nelson Pass said:
If he has issues with the 10 KHz peak, he can use a filter
that I found effective, which is 0.25 mH, 1 uF, and 22 to 100
ohms, all in parallel, this in series with the driver.

At 100 ohms, it knocks the peak flat. Between there and
22 ohms is where you are likely to find the sweet spot.

I also have information on crossing that over in an OB

😎
Click to expand...

Funny I just got 12 hours later notification about this thread. I will pass Pass's tip to the Cviller. :spin:
 
#58
Nelson Pass said:
If he has issues with the 10 KHz peak, he can use a filter
that I found effective, which is 0.25 mH, 1 uF, and 22 to 100
ohms, all in parallel, this in series with the driver.

At 100 ohms, it knocks the peak flat. Between there and
22 ohms is where you are likely to find the sweet spot.

I also have information on crossing that over in an OB

😎
Click to expand...

Thanks for the tip! 😀
I really should get this up and running - I'm getting so tired of pc speakers... 😱
It is just so much more complicated to build stuff when I don't have my tools and components. :bawling:
 
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