The Pecorinos

[cjd]

I need to get the baffle layout posted still, but here's 5-6dB of BSC.










R2 can range from 1-3.5ohm depending on whether you like more of a downward tilt (1ohm - 1.5ohm) or an upward tilt.

Don't want the BSC?




Tweeter resistor has the same range here to adjust tilt.

------------------------------------------------

Think... small. Ok, smaller.



Tidbits have been here and there so you may have some idea, but the rest will wait till DIY Chicago 2011.

What scares me most is I had almost everything I needed for the crossovers already...

[BeerParty]

Oh, come on, not even a little hint? :

[---k---]

Bose??? :P

[cjd]

Not quite double-cube small, no. But trying to get close to that size led me down this path. The enclosure material selection is probably the biggest difference from what you usually see.

[joeybutts]

This kind of stuff is just wrong.

Come on already. Is it time for the unveiling?!

[cjd]

Hey, I'll be on vacation the next two weeks so I can't post closer to the event.

Everything is available at PE. How's that for a hint? Maybe you guys can guess what I did. I think the info is around to figure it out...

Only 6 components in the crossover including l-pad too!

I might have to tweak some, but need them out in the room for that and right now they're just tucked up on top of shelves in my office.

[Bear]

This whole guessing thing? It's cheesy.

It may be starting to ... grate ... on some people.

:rofl:

I kill me.

[cjd]

Well, that fits. I was born in Wisconsin, and most flatlanders think I live there still...

[joeybutts]

This whole guessing thing? It's cheesy.

It may be starting to ... grate ... on some people.

:rofl:

I kill me.

This was good Bear....i dig.

[cjd]

RS100-8 and ND20

Birch ply baffle (1/2") aluminum box (Hammond) braced with 1/4" birch ply.
Sealed. 4.5 x 7.5 or so, don't want to look it up on my phone.

Still needs listening but at 6 components including l-pad.

Paired with an up firing RS265HO tuned around 20hz give or take. I think I need a variation with less BSC.

C

[Outfitter]

ahh, now you've got my attention! I love the idea of a small, high quality, simple, value design.

[---k---]

Another RS design. Blahhhhh. That was soooo 6 years ago. :P

Can you believe the RS drivers have been around that long. Wow.

I'm looking forward to hearing them next week. I'm actually looking for my next project, a smaller set of speakers for the living room.

[JonMarsh]

Another RS design. Blahhhhh. That was soooo 6 years ago. :P

Can you believe the RS drivers have been around that long. Wow.

I'm looking forward to hearing them next week. I'm actually looking for my next project, a smaller set of speakers for the living room.

'Cmon, K- it's not the ingredients, but the skill of the chef!

Let's see what Chris comes up with. :T

At least he's actually BUILDING stuff! I've hardly had time to even think about stuff, and maybe route a few holes. I'm frankly jealous, but I think I'm getting it under control this quarter. Actually had last weekend and this weekend off. :B

My problem is getting most of the stuff together for a project (like the Nascent's with Zaph's nice little driver) and having them sitting around for over a year collecting dust. Now I've got more ideas, but still need to just block out some time. Too much business travel coming up in November and December to have much free time, though. Until the holidays....

[cjd]

I've had these drivers about 2 years now... Perhaps longer. Think the 100's were from the special they ran when they were released. That count?

I manage to find the time but lack space to keep projects going over time which is the biggest hurdle. Takes more time to set up and pack up than I get time to work on stuff!

[JonMarsh]

Takes more time to set up and pack up than I get time to work on stuff!

That sounds VERY familiar, having just last weekend torn down from the stalled work on the Ardents from March- maybe I'll get back to these over one of the holiday breaks. I hope so...

[Outfitter]

OK, today's the day- eagerly waiting for the unveiling!

[bmaupin]

Mid/tweet with a sub.

[Hdale85]

Tiny! I like......hmmmm idea's for the bedroom

[---k---]

I was extremely impressed with these today. In the large conference room, I expected them to have to be pushed to hard to get adequate volume and sound distorted, and thin. I didn't have high expectations, only because of the room. Boy was I wrong! They needed the sub, but with the sub I thought they filled the room very well, including when turned up (CJD assured us they couldn't be blown-up). And they had that familiar CJD RS voicing. I was really impressed.

These are full BSC, so they need to be out away from the walls.

And, I think I'm going to build a sub just like his for a different project.

[oneplustwo]

Hmm, never seen an up firing subwoofer before!

[cjd]

Hmm, never seen an up firing subwoofer before!

Really? Hmm. Well, it kinda needs to play higher than average (and this driver certainly can do so quite nicely) so it seemed that would allow it to be a little bit omni in its radiation pattern thereby keeping localization issues less severe... on the other hand, for best results fully adjustable phase is likely required (not just the 180 switch).

It took a few tracks to get dialed, and as these were first up at the eventI didn't get to listen as much as I wanted since I was fretting about the setup, not to mention hearing all the tracks for the first time.

They did admirably without the sub as well.

[oneplustwo]

Makes sense to me. WAF might be a little more difficult to garner.

When do we see the detailed plans for the pecorinos? Looks like a fun project especially since I'm almost done (finally) with my Dayton 315 HF sub. I love that tweeter (same as my zdt) and have wanted to build a small pair of speakers. Also big fan of the rs series and haven't tried the 100s yet.

[Outfitter]

alright, cjd! It's been long enough. When do we get the details on this combo? I'm ready to start cutting wood- let's talk cabinet size and crossover.

[cjd]

I'm still finalising the crossover - specifically, a reduced BSC version which is much needed I think.

I'm also not sure if the RS100-8 is a drop-in for the RS100S-8, nor how the proximity of the unshielded driver will impact the inductors in the crossover. This is a concern on my part, I may have to snag some plain 8's and test.

Box: 7.4"x4.75"x3.2" Hammond project box. I did one vertical 1/4" ply (half-inch tall) rib epoxied to the back, and two horizontal ribs - one 1/4", one 1/2" ply so I could screw the crossover to it.

1/2" baffle, flush-trim to the box and simply pressure fit (I believe it took 3/4" screws - I used hex-head stainless...)

RS100-8 and ND20FB.

[impala454]

I really dig the idea of using a project box like that!

[JonP]

I'm still finalising the crossover - specifically, a reduced BSC version which is much needed I think.

I'm also not sure if the RS100-8 is a drop-in for the RS100S-8, nor how the proximity of the unshielded driver will impact the inductors in the crossover. This is a concern on my part, I may have to snag some plain 8's and test.

Hmmm... I have some of the RS100S's, been looking for some kind of serious home for them. (have done some not very serious things :B ) Will keep an eye on this... We might even have a few of those left over at work!!

On the proximity thing with the massive shielding magnet and cup, I did some studying of effects of various kinds of metal in proximity with inductors. Have access to a nice lab grade LCR meter at work. Basically I found that ferrous metals have to be within 3/4" or closer to have much effect, depending on the orientation. By 1" it was negligible. Non ferrous metals had only a small effect, even flat on or even stuck thru as a core. A note, I only tested with air core inductors.

I was surprised, expecting to need larger spacing. Also, between a magnet or just iron, there was no difference in effect. That probably WOULD be different with an iron core inductor, and the magnetic field starting to presaturate the core...

Hope that helps with the placement choices...

Edit: Just ran out to garage and whipped a shielded one out, 2 1/4" from back of magnet to back of flange... so you're not going to run out of box depth... :T

[oneplustwo]

I think I can convince my wife to let me put these in the bedroom... might be a little thin without the sub, but certainly will be much better than the horrendous TV speakers that i currently live with.

Has anyone done a design with the RS75s? I didn't see any after a quick google search. I kinda want to buy a pair just because they're so small.

[---k---]

I'm sure you could build a sub that would fit under the bed.

RS75? I didn't even know there was such a thing. Must be new. Or I'm out of it.

[Hdale85]

Get one of the pancake subs, that should fit under a bed pretty nicely. They don't need much of a box either.

[oneplustwo]

The RS75: http://www.parts-express.com/pe/show...number=295-380

[Brian Bunge]

These look awesome, but why do I always seem to have the wrong drivers?! I've got the 100-4's!

[cjd]

hmmm... Maybe I should snag one of the new -8's and a -4 and verify the 8, add a -4 option... but that'll have to be after the holidays. Way too much going on right now.

[BOBinGA]

Hey Brian Bunge,
I don't mean to hijack cjd's thread here, but if you have the RS100-4's, there is my little A7 design:

https://www.htguide.com/forum/showthread.php?t=38222

It's a little bigger than cjd's because they are ported, but not much. And since they are ported, a sub is not required, but is still recommended.

BTW, I'm in Acworth. It's the other side of ATL from you, but we should get together sometime.

-Bob

[Silver1omo]

An on/in wall XO for these would make them a HUGE WAF project.

[Brian Bunge]

Bob, I've seen those before and thought about building them! I usually have a couple of those tweets laying around anyway. I'm currently building some ntn's from the PE tech talk board. They are at my dad's place down in Milledgeville so maybe I can finish them soon. Also, I actually live up in Alpharetta now so probably not so far away.

[cjd]

NTN was... harsh. On-axis wasn't bad but I'd guess power response was poor. Neat little package though.

[BOBinGA]

cjd,
If you feel lke sharing, I would like to see the XO you used, even if you still consider it a work in progress. I think I did pretty well on my little speakers, but I had a hard time integrating the two drivers while only using a bare minimum of XO parts and I would like to see how you handled it. I can see where additional parts could be used, like for taming the tweeter impedance bump around 2k, but stuffing more than a handful of parts in a tiny box is too difficult and doesn't seem to gain you much.

-Bob

[Brian Bunge]

Harsh? Hummm...do you think the tweeter do needed more work or were the woofers playing too high? I like nice clear vocals but do not like harsh...

[---k---]

Brian,
Lots of people like the NTN, so maybe CJD and I just have different ears.
I built the original NanoNeo design. But, I put it in a slightly smaller sealed box and eventually on wall. Not sure if it will help you in tweaking since you're doing the NTN, but here is the changes I made:

https://www.htguide.com/forum/showthread.php?t=37990

[cjd]

It's hard, in a day full of listening, to really be sure what I was hearing. I might guess integration wasn't quite even resulting in an upper midrange peaking off-axis.

Bob, I plan to share if I can get the damn network posted. Having technical difficulties among holiday feast preparations.

I believe it contained 1mH, .5mH, 3uF, 2.5uF caps, 8ohm and 2.5ohm resistors. Exactly what order... :/ I have to look.

C

[cjd]

Updated the first post with crossovers, response graphs, etc. Still have to get the baffle layout put together. Enjoy.

[---k---]

Getting close to being ready to be on the list of htuide speakers


Ill add you once I get home to a real computer instead of this little tablet

[DeathMonk]

Nice. It's always good to have different options in the small category.

[JimH]

Hows the baffle layout coming? And some detail on the box you used would be nice!

[cjd]

Whoops! Thanks for the reminder.

Woofer centered horizontally, center at 2¼" from the bottom.

Tweeter at 2¼" from the top, 1½" from one edge.

Baffle is whatever dimension you prefer - I used 12mm birch ply. Box is the project box noted, with some 1/4" plywood (about 1/2" wide) reinforcements epoxied to the back.