C-Note MT Bookshelf Speaker Kit Pair & Other kits

[Millstonemike]

Hi, I just purchased the C-Note kit. This is my first bookshelf / indoor speaker project (I come from the world of car audio). I'm pretty excited about this build, but had a quick question. What damping material, if any, should i use between the speaker enclosure and my desk? It seems that most people that have built C-Notes or Overnight Sensations don't install any hardware on the bottom of the enclosure. No feet, spikes, rubber pads, felt pads, etc. Wouldn't this create audible resonances and annoying noises? Or am I over-thinking it?

Just brainstorming ... no experience with using it for speakers. These neoprene "like" mats are 3 mm thick and can be easily cut to size ...

[flyinglotus1983]

I always use rubber feet on the bottom of my speaker cabinets. I use different sizes based on the cabinet size/weight. I used these https://www.parts-express.com/penn-e...31-h--260-7706 on my OS's and I think they would work for the C-Note's too. I usually look for a low profile height, I don't want my speakers looking like they are on stilts.

These were the ones I put into my card when I purchased the C-Notes: https://www.parts-express.com/penn-e...-05-h--260-773 It looks pretty close to the ones you linked, although I'm not sure that either actually list a durometer or hardness. I'm a bit worried that they could be too hard, but I guess I'll see what happens.

[mmbone4]

Built the C-Notes about a month ago. Sound very clean and cannot be beat for the money. I am trying to create a specific look for these. I am wanting to seperate the tweeter and woofer about an inch. I know it will effect the timing/sound. BUT...how much? Chris, can you look at this and simulate it and tell me if seperating them about an inch wold make a huge difference?

Thanks for such a great speaker design!

MB

[Chris_Perez]

Built the C-Notes about a month ago. Sound very clean and cannot be beat for the money. I am trying to create a specific look for these. I am wanting to seperate the tweeter and woofer about an inch. I know it will effect the timing/sound. BUT...how much? Chris, can you look at this and simulate it and tell me if seperating them about an inch wold make a huge difference? Thanks for such a great speaker design! MB

Thanks mmbone4,

Separating them by an inch or so won't be so bad really. You may notice some vertical lobing (dips when physically moving up and down), especially within 6 feet or so, but it would only be a few dBs in the 1,000 to 5,000 Hz range. Nothing terrible... peaks in that range will sound harsh, dips just sound different. Move further away and you probably won't even notice the difference.

[mmbone4]

sounds like its worth a try at least...thanks Chris! Happy New Years Guys!

[Swerve City]

I got a C-Note kit for Christmas. I'm very excited to start building. I'm trying to go cheap, but already filled an $80ish cart to finish them off.

[ejh2854]

Ordered the kit on the 27th, and it's already here... not bad, PE! The box looks like UPS simply kicked it here (NC) from Ohio, but everything's intact.

Looks like a meaningful-step-up from the Quarks currently running in the office- not that there was any complaint as it was.

.

[Jeff F.]

Anybody interested in the C-notes for $90, use coupon code KIRBYTEN at checkout through 12-31-17.

[ronk]

Listened to my c note aafter playing with my tabaq. Nice sound from. C note and more bass than tabaq.

happy 2018 c note i wners.

[flyinglotus1983]

Finally got my C-Notes built and hooked them up today. At first it was just one speaker because the second one still had glue drying. Was pretty disappointed in the lack of bass and it didn't sound spectacular in any way at the time. I was seriousness considering logging in here and firing off an email about how disappointed I was.

So then, after the second one was done and I plugged it in, situated the speakers just so, and put on some testing music... Holy crap. These things image like crazy. It's holographic pinpoint, and it doesn't even break a sweat doing this. Considering that this is the first set of speakers I've owned that do this, I'm impressed. They're not perfect by any means. But I do see what all the fuss is about.

[Swerve City]

Made my crossovers today. I also used the 3x5 circuit board and did all my soldering joints underneath.

[ejh2854]

umm... "Wow", you have got to be kidding me for a hundred bucks.

Just got the xo's done today, couldn't resist throwing the drivers in with a couple of screws each just to get an idea of what the fuss was about... I built these to replace the Quarks in my office, and as much as I like the Quarks these are a substantial increase in muscle. Running them on a Dayton DTA-2.1BT (https://www.parts-express.com/dayton...pply--300-3830 with the same Anarchy TH, more than enough juice to be 'waay louder than I'll ever listen in here. I see why you guys have been raving about these boxes.

.

[JBou]

Hello, I recently purchased the C-Note speaker kit. This is my first build and I know very little about speaker design, so please bear with me!
I have a few questions before I begin the build. I skimmed through the thread but didn't see any posts fully addressing my questions.

I have read that the cabinets for this kit could use extra bracing or possibly the addition of some sound absorption material on the walls of the cabinet.

I am considering doing one of these.My main question is, is it worth the effort to do this?

My concern is that the addition of bracing or the addition of the sound absorption material will appreciably alter the internal volume of the cabinet, such that it will have a detrimental effect on the sound quality. Is this a valid concern? Actually, is the sound absorption material "transparent" to volume consumption or does it "change" the apparent volume that the driver sees?

Here are the details of the two approaches I was considering:

For the sound absorption materials,I already have this from parts express: Sonic Barrier 1/2" Acoustic Sound Damping Foam with PSA 18" x 24". I was considering placing it on all surfaces but the front baffle. Is this a correct approach?

For the bracing, I was considering doing a window type rectangular cut-out parallel to the top and bottom in between the two drivers, about 1" to 1 1/2" wide made from 1/4" MDF. Note that I have the woodworking tools and skills needed for this including a router to route out the channel for the brace.

Any comments or suggestions would be greatly appreciated.

Jim

[Millstonemike]

C-Note speaker kit. 

Here are the details of the two approaches I was considering:

For the sound absorption materials,I already have this from parts express: Sonic Barrier 1/2" Acoustic Sound Damping Foam with PSA 18" x 24". I was considering placing it on all surfaces but the front baffle. Is this a correct approach? Yes, perfect.

For the bracing, I was considering doing a window type rectangular cut-out parallel to the top and bottom in between the two drivers, about 1" to 1 1/2" wide made from 1/4" MDF. Note that I have the woodworking tools and skills needed for this including a router to route out the channel for the brace. Yes, plywood may be better choice for a brace - a circle cut out in each the panels 4 quadrants.

Any comments or suggestions would be greatly appreciated.

Jim

 

[a4eaudio]

I haven't seen any posts that I recall that particularly addressed those issues, but:

• Lining a ported box as you suggest is the typical approach;
• I have not seen anyone adding additional bracing. I am building a pair and am not adding anything. Adding some simple dowels across the inside walls would be easier than the window-brace. However, adding the window brace can't really hurt and isn't going to affect volume that much - plus using a router and making a pretty window-brace is much more fun if you are a woodworker.