LECBOS Buyout MTM $120/pair

[LouC]

Re: LECBOS Buyout MTM $120/pair

You might have a problem fitting those drivers on an 8" wide baffle. Maybe with 1/2" stock you can do it. You need to have about 5.75 - 6" for the driver cutout. The center to center distance on the drivers is the main thing to keep the same. You can adjust the box height & depth to maintain the same volume. There's not enough BSC to worry about the width. Unless they are going flat against the wall, or inside a tight cabinet, you can use a tube port or slot port out the back (or top, or side or bottom...) If you run them as "small" you could try plugging the port with some foam or fabric if you have sub matchup issues. Some receivers allow you to pick the rolloff, others are fixed at 80 or 90 Hz.

A good sealed volume would be about 11 liters -- not that much smaller than the 18.5 I used. F3 about 105 db. You can do them sealed, but I don't recommend it. They will be more versatile ported.

Feel free to email me if you need more help.

[ssgt James]

Re: LECBOS Buyout MTM $120/pair

10-4, Thanks Lou.

[Brewski]

Re: LECBOS Buyout MTM $120/pair

You might have a problem fitting those drivers on an 8" wide baffle. Maybe with 1/2" stock you can do it. You need to have about 5.75 - 6" for the driver cutout. The center to center distance on the drivers is the main thing to keep the same.

Lou,

How much would it affect your CTC if the drivers were rotated so the flats oriented with the sides rather than the tweeter? If the drivers are oriented flat to the side an 8" baffle with 3/4" MDF shouldn't be too bad, but it will limit the size of your round over. If there isn't enough room to rotate the driver 2 of the screws mounting the driver would have been driven into the 3/4" MDF I was using so they'd probably be fairly close to the seems for 1/2" widths as well.

Take it easy
Jay

[LouC]

Re: LECBOS Buyout MTM $120/pair

Rotating the drivers won't do anything for the inside dimensions. The through hole is at least 5.75 (I usually cut a 1/16 over on surface mounts and/or stamped frames) I suppose you could cheat a bit on that if you had to.
I did mine in 1/2" BB and they are rock solid. I just didn't want to send a newbie down the "dammit, why didn't I think of that..." road.

[LouC]

Re: LECBOS Buyout MTM $120/pair

Hey Lou,
I don't know how to post the original link to my post, but I am limited to 8" max for my center.
CJ

Let me know if you are interested in my Seas Coax center. 7.5" high, 8" deep.

It's sitting on shelf now gathering dust, it should fit your cabinet. I'm happy running phantom mode. I'd rather see it used. Email me if you're interested.Hey Yankee G.I. for you special deal...:D

[Brewski]

Re: LECBOS Buyout MTM $120/pair

Rotating the drivers won't do anything for the inside dimensions. The through hole is at least 5.75 (I usually cut a 1/16 over on surface mounts and/or stamped frames) I suppose you could cheat a bit on that if you had to.
I did mine in 1/2" BB and they are rock solid. I just didn't want to send a newbie down the "dammit, why didn't I think of that..." road.

Ahh I see your point I was thinking you were warning about the two screws ~6.75" apart possibly hitting the side walls of an 8" baffle as well. I discovered that the hard way and ended up rotating the drivers as a result. (Doh daughter just used a plate as a discuss time to run) :eek:

Take it easy
Jay

[LouC]

You Snooze, You lose...

I've finished up the LECBOS build (includes a BOM). Added some text and new pictures to my webpage: LECBOS

July 5 - I bumped the padding resistor for on wall mounting. Added some pictures of the final setup, and a bit more to the write-up.

Apparently the tweeter I used in this design is NLA. I've had several queries about substitutes. My SWAG would be the shielded version of the same tweeter (279-177) Response curves look very similar, sensitivity/impedance is pretty close too. Try at your own risk.

Since I only measure in the box, I have no simple way to suggest or model a substitute. FWIW, the FRD/ZMA files I used are part of the writeup. Feel free to use those and work up an alternative.

[johnnyrichards]

Re: You Snooze, You lose...

Apparently the tweeter I used in this design is NLA. I've had several queries about substitutes. My SWAG would be the shielded version of the same tweeter (279-177) Response curves look very similar, sensitivity/impedance is pretty close too. Try at your own risk.

Since I only measure in the box, I have no simple way to suggest or model a substitute. FWIW, the FRD/ZMA files I used are part of the writeup. Feel free to use those and work up an alternative.

Lou, the Vifa BC25SG15-04 is also very close to a drop in. I have both versions here, if I am doing nothing later today I will throw the 15 version in my current project and see how it looks compared to the 19.

[johnnyrichards]

Re: LECBOS Buyout MTM $120/pair

I measured the BC25TG19-04 and the BC25SG15-04 (which is a regular stock item at PE for ~$13) in my Iowa project. I left the highpass filter in place so if anything, it shoudl be indicative of suitability as a drop in. Draw your own conclusions, but it looks to me to be very close to a drop in, with maybe slightly less padding on the tweeter, but that could just be unit-to-unit consistency.

Pay no attention to the legend at the bottom of the image, the hot one is the buyout version.

[LouC]

Re: LECBOS Buyout MTM $120/pair

I've had some PM's asking about this. It sure looks pretty close. I went ahead and added some verbiage to the LECBOS page about this as a replacement tweeter. (With proper credit/blame for Johnny of course!;))

If anyone tries this, let me know and I'll add your tweaks to the build page.

[johnnyrichards]

Re: LECBOS Buyout MTM $120/pair

Glad to help, Lou