Fun with the new ND Passive's - The Passive Aggressives

[Kevin K.]

So I was looking through the hum drum lumber at Menards for this project, they have some 1/2" stock in a few species. Then I saw this maple 3/4" board with really nice grain, so I bought it. These drivers really need relief in the back of the baffle.

That's a good looking board you picked up. Should really come to life with some finish applied to it. Good luck!

[djg]

So I was looking through the hum drum lumber at Menards for this project, they have some 1/2" stock in a few species. Then I saw this maple 3/4" board with really nice grain, so I bought it. These drivers really need relief in the back of the baffle.

[Kevin K.]

I like the idea of this build Matt but was thinking of changing it up a little. Mine would most likely be for desktop use, so there would be some benefit to getting the tweeter up a little higher by putting all the drivers and PR's on the front baffle, T/W/PR/PR. Was also thinking of maybe building a partition that runs with the height of the cabinet so the crossovers could be mounted to the back of it via a removeable back on the cabinet. I'll model something up soon and share. Nice work Matt!

[djg]

Too late.

(For me).

[mattp]

Guys,

A kit is forthcoming so I would urge you to wait a little bit to save on the cost of these little guys if you are inclined to want a pair. I will have cabinet samples tomorrow which means the manual can be started soon. (Assuming no cabinet changes are needed.)

Also, yes, if certain parts I posted are not in stock they can be replaced with other brands of the same value. These are a 4 ohm speaker.

Matt

[BOBinGA]

Oh, it's definitely a 4 ohm speaker. The woofer is spec'ed at 4 ohms. Plus, the lmpedence curve in post #2 is almost exactly 4 ohms from 200 hz to 1000 hz. But it doesn't go at all below 4 ohms, so almost any receiver could drive them. But don't try to parallel two. That would be a 2 ohm load and a real problem for a modest receiver to handle.

[mga2009]

Can anyone confirm if this is an 8ohm or 4ohm speaker?

My poorly understanding of this diagram, tells me it's an 8ohm speaker:
http://techtalk.parts-express.com/fi...tch?id=1370583

But the impedance curve shows values closer to 4ohm...

[djg]

I just submitted the same order. The Jantzen coil is the same gauge and inductance, no problem.

[mga2009]

Hi,

I am looking for a pair of little surrounds for my system, and found these while looking the Heliums and Quarks...

These would be used for movies and gaming, hanged from the rear wall. Do you think the location might affect SQ?

I've attached a BOM from PE. Had to replace the 3ohm 5w resistor with a 10W, and the Dayton Inductor 0.15mh with a Jatzen, as both items where not in stock. Is it OK?

Thanks!

[tomzarbo]

Got to hear these at the MWAF yesterday and they were pretty dang impressive! I will be putting a set of these together likely pretty soon.
TomZ

[Jake]

I like the name, quite appropriate! Impressive tuning on a tiny box. I think a kit would do well.

[ceiol]

thank you

very helpful for a novice like me.

[mattp]

Sure, I sent them to you via PM.

[ceiol]

I used my own in-box measurements for my XO design. Phase still isn't perfect but that would explain why you are getting a different curve with your sims.

would you mind sharing your measured FRD and ZMA files? It would be educational for me to play around with them.

thanks in advance!

[Mike Burke]

Oh Yea....I see that now.

Got it

Thanks for the help