Lil' Brit... The "LS 3/5-MEH" Monitor build thread

[mzisserson]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

It's the cone-tweeter's Fs, methinks. Even in the last plot you have posted below, that little peak rears its ugly head.

Sounds like an Fs comp of some sort will make your life much easier.

Later,
Wolf

It would. Thought about it, but if you look at the distortion plot it really is not hurting all that much. While these are full of "color", it does not stick out like a soar thumb. Going to 4 ohms as well lowers that bump another 2dB or so. The point is simple, so I may live with the caveat. That's the best thing about these, they are easy to play with. Funny how a big cone tweeter acts like a small waveguide...

Sometimes the KISS strategy works!! Great job.

I have a bunch of those Sonys as well....but I've not started anything just yet. I'm happy to see that area around 5k looking relatively flattish after all the talk about the "5k ringing problem"

Did you do any damping to the stamped frame on yours?

Not yet, the drivers are not even gasketed yet. Just built the cabs and threw them in with some stuffing. It should only get better with some gasketing material and finish work. The frame does not seem to be all that much of an issue.

The "5k ring" was easily tamed by the inductor. There is such an overlap between the woofer and tweeter, the inductor pushed it low enough to take it out of the equation. Unlike the tweeter's 1K peak, it was audible running full range.

[brokencrank]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Sometimes the KISS strategy works!! Great job.

Yes, great job indeed. As the crossover was being explained before we listened to these yesterday, that was the first thing that came to mind...simple often works very well!

I think they not only fit their original design intent, but are capable of much more. Nicely done!

[billschu]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Congrats Mike. I'm glad it worked out.

I'm glad Ive got 25 of these to play with at some point. I think I'll be dabbing some silicone on the back of the stamped basket and use fat headed screws or washers so I don't damage it when installing them.

Bill

Yes, great job indeed. As the crossover was being explained before we listened to these yesterday, that was the first thing that came to mind...simple often works very well!

I think they not only fit their original design intent, but are capable of much more. Nicely done!

[Brewski]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Nicely done congrats on the super budget build

Take it easy
Jay

[johnnyrichards]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

I do believe my niche is threatened here... :p

[greywarden]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Looks pretty decent! And the BoM??? ;)

[mzisserson]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Looks pretty decent! And the BoM??? ;)

1mH inductor on the woofah

1uF cap on the tweeter

3 or 4 ohm resistor (whichever flavor you like) on the tweeter.

Done.

[Leroy R]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Did you post internal cabinet volume and/dimensions, baffle dimensions and driver placement?

[mzisserson]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Did you post internal cabinet volume and/dimensions, baffle dimensions and driver placement?

No fancy drawing, but....

11"H x 7"W x 5.25"D External dimensions using 0.5" thick MDF. 0.15ft3.

Tweeter center is 2.5" from the top, mirror imaged 0.5" in a l/r pair.

Woofer is 7 5/16 from the top of the cab, on center.

3/8" rounds on the sides for diffraction.

Woofer gets a 4-7/8's cutout, tweeter gets a 3" cutout. No countersinking.


Heavily stuffed interior of the cab.

Easy, that's about it!



JohnnyRichards-I do believe my niche is threatened here...

Thanks Johnny. It is amazingly ironic how good these sound. So much fun too to just design and have a little fun tinkering for the heck of it. Ultimately, they will be used with a Lepai amp in my Wife's classroom, but it's the second pair that will be mine! I had to build two at a time... They are too cheap not to!

I am thinking presents, too.

[Leroy R]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

Thanks for the design. I've been waiting for a design using the Sony.

[ameuba10]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

I have a noob question for ya...when you say

"1mH inductor on the woofah

1uF cap on the tweeter

3 or 4 ohm resistor (whichever flavor you like) on the tweeter."

i assume thats 1mh on the + side of the woofer. and is the cap and resistor in series on the + of the tweeter?

[mzisserson]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

I have a noob question for ya...when you say

"1mH inductor on the woofah

1uF cap on the tweeter

3 or 4 ohm resistor (whichever flavor you like) on the tweeter."

i assume thats 1mh on the + side of the woofer. and is the cap and resistor in series on the + of the tweeter?

It does not matter. It's a/c

What does matter (that I forgot to mention) is the phase is inverted on the tweeter. so the + lead out from the xover goes to the - terminal and vice/versa.

Little details, usually wrapped up when I release the build notes, this one seems to be happening real-time.

[XtremeRevolution]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

How's the bass output on that Sony driver? What cabinet alignment did you choose for it?

This thread may have convinced me to design something using that sony driver and this Tymphany fullrange:

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=299-249

[billschu]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

The buyout is not much of a bass unit. Maybe 80 Hz in a small sealed box? I wouldn't pair that full range with the Sony.

How's the bass output on that Sony driver? What cabinet alignment did you choose for it?

This thread may have convinced me to design something using that sony driver and this Tymphany fullrange:

http://www.parts-express.com/pe/show...number=299-249

[XtremeRevolution]

Re: Lil' Brit... The "LS 3/5-MEH" Monitor build thread

The buyout is not much of a bass unit. Maybe 80 Hz in a small sealed box? I wouldn't pair that full range with the Sony.

What would be the difference between pairing it with the Sony and using the cone tweeter/mid in this thread? I had imagined that I would be able to cross lower if using the full range driver, and the Goldwood tweeter seems to be $0.75 more expensive per over the 2" fullrange if I'm looking at the correct one:

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=270-018&FTR=goldwood%20cone%20tweeter

The sensitivity seems to match fairly well, to the point where I may even be able to get away without any resistors, making this an even cheaper two-element crossover.