Next up in the shop: a LOUD, paper-cone 3 way

[Pete Schumacher]

Re: Next up in the shop: a LOUD, paper-cone 3 way

I like the idea of a "rear-firing woofer," because it allows the front of the cabinet to be narrower. Verity does this with their designs, and they look quite elegant, in my opinion.

[DoubleTap]

Re: Next up in the shop: a LOUD, paper-cone 3 way

2. Where's a good place to get raw veneer?

Sorry, didn't notice this question ... my 2 favorite sites

http://www.wood-veneers.com/

http://www.certainlywood.com/

[Pete Schumacher]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Sorry, didn't notice this question ... my 2 favorite sites

http://www.wood-veneers.com/

http://www.certainlywood.com/

you could spend HOURS just looking at all the veneer in that first link.

:eek:

[mightym]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Forgive my ignorance, I could find nothing on the Trapezoidal sectioned MTM Mr. Schumacher showed us in Post # 106.

Interesting looking speaker. I heard the small Von Schweikerts with the Fostex Mid's earlier this year, and was quite impressed. Are there any other sources besides Von Schweikerts web site with info on the above referenced speakers?

I'm looking forward to seeing a completed build here, sorry about the garage crack, I honestly thought that's what these were for, MY Bad....

Back to lurking now,
John

[Pete Schumacher]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Forgive my ignorance, I could find nothing on the Trapezoidal sectioned MTM Mr. Schumacher showed us in Post # 106.

Interesting looking speaker. I heard the small Von Schweikerts with the Fostex Mid's earlier this year, and was quite impressed. Are there any other sources besides Von Schweikerts web site with info on the above referenced speakers?

I'm looking forward to seeing a completed build here, sorry about the garage crack, I honestly thought that's what these were for, MY Bad....

Back to lurking now,
John

That was a Von Schumacher design!!! ;) It just fit the description of narrow front with larger back for a woofer. That particular creation had an Adire Audio DPL12 on the bottom. Could have easily been mounted on back as well.

[Paul Carmody]

Re: Crossovers n' measurements

First off, I have a name for these monsters! I call them Tarkus. For those uninitiated in prog rock, it's the name of an epic song by Emerson, Lake, and Palmer (which sounds quite good on these :D). Tarkus is a half-armadillo, half-tank creature. Seemed appropriate on many levels.

Now, onto the crossover. Nothing too complicated. Mostly 2nd order electrical filters and L-pads all around. The mid has a notch filter (C4 + L3) at 4500 Hz, because the mid does have a bit of a breakup, and it's worth the few dollars in parts to get that hash out of the way when cranking these things to 11.







The parts count has some wiggle room in it. What's shown is what I'd consider middle-of-the-road; nothing fancy, but no cut corners, either. I paralleled an electrolytic + poly cap on the mid circuit for [potential] sonic benefits, however there's no reason one couldn't use a single 65 uF cap instead. Likewise, the L-pads use the Dayton 10-watt non-inductive resistors in pairs, which brings the power handling up to 20 watts each (which should be enough). Someone could just as well use single 20+ watt wirewound resistors for the L-pads and it'd be fine.
My total is $310; with the cheaper substitutions above, it was around $290. Of course, you can always shop around for components as well....

[Paul Carmody]

Re: about the shape...

In case anyone was wondering, the angled cabinets in this design are purely cosmetic. One could achieve the exact same-sounding speaker using rectangular enclosures, just as long as the interior volume of the cabinets is the same. (I have "square" drawings of them on my hard drive somewhere... )

[evilskillit]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Ooooo, I like these. I have no reason to build a pair, but I really kind of what to. I guess I could put them in the living room. Or in the music room and move the music speakers to the living room, heh.

Actually I'll probably just push to get somebody I know to build a pair o have me help them build a pair so I can see and hear them. Either way, I like. Are these by chance what you're bringing to Iowa? *excited*

[fastbike1]

Re: about the shape...

No, no! We likes the angles. Just another set of stacked boxes otherwise.:p

In case anyone was wondering, the angled cabinets in this design are purely cosmetic. One could achieve the exact same-sounding speaker using rectangular enclosures, just as long as the interior volume of the cabinets is the same. (I have "square" drawings of them on my hard drive somewhere... )

[kirk78h]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Does that make sense? Obviously it's a bit hard to put into words but I think anybody proficient enough to build cabinets in the first place can figure it out once they get going. The process takes more time than contact cement, but I don't think is any harder ... and cold press is a better bond than contact cement.

Please forgive the hijack / side note to the thread for a moment; but I have to ask -- how you deal with glue squeeze out with this method?

[jackhughman]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Hi,
I hope you don't mind me chime-ing in here but I learned a lot.
I love the crossover integration and the mix of woofer / mid slopes. thanks heaps Paul. cheers, Jack

[fastbike1]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Use a bit less glue, and use blue painter's tape around the edges that aren't being worked. You don't need a huge amount of glue, at least not with the Titebond Cold Press.

Please forgive the hijack / side note to the thread for a moment; but I have to ask -- how you deal with glue squeeze out with this method?

[ktaillon]

Re: Next up in the shop: a LOUD, paper-cone 3 way

I don't see a picture with the grill off. How do you know?

If you click on the VR-33 you will see the inside of the speaker and the back of the drivers. Reading under the tech specs they talk about the 10” Tymphany subwoofer faces the rear wall.

The drivers look very similar. Nice speaker project, I like getting a lot from a lower cost setup.

[DoubleTap]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Please forgive the hijack / side note to the thread for a moment; but I have to ask -- how you deal with glue squeeze out with this method?

If you apply the glue with a roller you're not going to have any, or very little squeezed out. And even if some does it's nothing to worry about, just sand it off or shave it off with a razor blade.

[Dean1000]

Re: Next up in the shop: a LOUD, paper-cone 3 way

Really thinking about building a set of these if I can use the Peerless 10" buyouts (830634) that I have on hand in place of the Peerless 830668. I have listed the parameters below for each. What are your thoughts on this? Parameters close enough to go ahead? Thanks for any feedback.

Peerless 830634
Originally manufactured for a famous, premium brand of Finnish self-amplified studio monitors. Stamped steel frame with generous ventilation and minimal airflow restriction; chamfered edge minimizes diffraction effects. 1-1/2" two-layer copper voice coil with 1" winding. Parameters optimized for equalized sealed enclosures. Buyout, limited quantities. Specifications: *Power handling: 110 watts RMS/220 watts max *VCdia: 1-1/2" *Le: 2.1 mH *Impedance: 8 ohms *Re: 6.7 ohms *Frequency response: 36-4,000 Hz *Fs: 36 Hz *SPL: 89.5 dB 1W/1m *Vas: 2.58 cu. ft. *Qms: 2.80 *Qes: 0.65 *Qts: 0.53 *Xmax: 8.5 mm *Dimensions: A: 10-3/8", B: 8-7/8", C: 5-1/4".
• Designed for active studio monitors
• Premium sculpted stamped steel chassis with low-diffraction edge
• Under-dust cap and under-spider venting
• Treated long-fiber paper cone with rubber edge
• Bumped backplate permits maximum linear excursion
• Ultra-flat response to 2 kHz



Peerless 830668
The Peerless SLS Series combines high quality performance with an affordable design. The SLS drivers are ideal for use in systems with high power handling requirements, and are a logical choice for use with the SDS line of transducers. Specifications: *Power handling: 110 watts RMS/220 watts max *VCdia: 1.5" *Le: 3.3 mH *Impedance: 8 ohms *Re: 5.6 ohms *Frequency response: 33.3-2,000 Hz *Fs: 33.3 Hz *SPL: 88.7 dB 2.83V/1m *Vas: 2.44 cu. ft. *Qms: 4.85 *Qes: 0.57 *Qts: 0.51 *Xmax: 8 mm *Dimensions: Overall diameter 10.35", Cutout diameter 8.82", Depth 4.85".
• Premium sculpted stamped steel chassis
• Coated paper cone with rubber edge
• Shorting ring in magnet system