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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th April 2011, 11:04 AM   #1061
rubennn is offline rubennn  Denmark
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Quote:
Originally Posted by Saturnus View Post
The handle is 24mm because the port has to be 36mm long.

Both the new version of the woofer and the new version of the piezo will take up a tiny bit more volume than the older ones.

Please note that with 12mm ply the overall internal length is 393mm as the electronics compartment will take up 3mm more space.

As far as I remember I calculated the cabinet tuning for 23.4 liter to be on the safe side (calculated volume minus 1 liter).

Port area is 34cm2 (=6.58cm) and 36mm length, btw.

But I don't think it's a bad idea to make it in 12mm. I'll probably do the same next time just because it's a much easier cut-out plan and you can make it from the same board.
1.
I actually based these calculations on your classic design. I'm not sure what you mean by the handle being 24 mm? I guess you mean 24 mm in thickness when 2x 12mm ply is glued to each other. Same with the port being 36 mm long - what do you mean here? Is this the depth of the port?

Since the speakers take up a bit more volume and the cabinet is a little bit bigger, I'll probably keep it as it is.

Actually, the stereo I made for my sister was all made out of 12 mm ply and the length/width (whatever you may call it) of the cabinet was actually adjusted to 393 mm. So that fit perfectly

2.
So you're saying that I should just go for making the internal volume 24,4 and add up the volumes of all what should be inside the cabinet itself (including the whole port)

3.
I hope I understand this right: If the port is a tube it should be 6,58 cm and length of the tube 3,6 cm.

If it's square, it should just have an area of 34 square cm. Then I can fit whatever dimensions I like?

Last edited by rubennn; 14th April 2011 at 11:09 AM.
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Old 14th April 2011, 11:32 AM   #1062
rubennn is offline rubennn  Denmark
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Nahaz, you're probably best off ordering them yourself. Ordering 10 is about the same price as ordering 4 tweeters from ljudia.se including shipping. Correct me if I'm wrong.
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Old 14th April 2011, 11:51 AM   #1063
Nahaz is offline Nahaz  Sweden
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Rubennn: The shopusa site does not ship to Sweden so I have no option of getting the tweeters to my address, that was why I wanted to buy some if anyone had to spare : )
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Old 14th April 2011, 12:09 PM   #1064
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Quote:
Originally Posted by Nahaz View Post
Im curious about this statement, what exactly is the optimum sensitivity for portable devices, and what is different with the Lepai compared to any other ebay T-amps in this regard?
The Lepai has 200mV input sensitivity. That's equal to an amp6b with 22K/82K Ohm Rin/Rfb which is 189mV to be exact.

Last edited by Saturnus; 14th April 2011 at 12:26 PM.
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Old 14th April 2011, 12:14 PM   #1065
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Quote:
Originally Posted by rubennn View Post
1.
I actually based these calculations on your classic design. I'm not sure what you mean by the handle being 24 mm? I guess you mean 24 mm in thickness when 2x 12mm ply is glued to each other. Same with the port being 36 mm long - what do you mean here? Is this the depth of the port?

Since the speakers take up a bit more volume and the cabinet is a little bit bigger, I'll probably keep it as it is.

Actually, the stereo I made for my sister was all made out of 12 mm ply and the length/width (whatever you may call it) of the cabinet was actually adjusted to 393 mm. So that fit perfectly

2.
So you're saying that I should just go for making the internal volume 24,4 and add up the volumes of all what should be inside the cabinet itself (including the whole port)

3.
I hope I understand this right: If the port is a tube it should be 6,58 cm and length of the tube 3,6 cm.

If it's square, it should just have an area of 34 square cm. Then I can fit whatever dimensions I like?
1: Yes, I mean it when 2 pcs of ply is glued together for 24mm. With the end plate that makes the port/handle 36mm deep. Remember at least one of the 2 pieces of ply that makes up the port should go the entire length of the end piece to brace it.

2 and 3: Both correct.
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Old 14th April 2011, 12:24 PM   #1066
Nahaz is offline Nahaz  Sweden
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I see, the thing is that Topping, Muse and several of the other more or less "noname" class T amplifiers on global.ebay.com have 200mV input sensitivity aswell. I thought the Lepai was a better option for additional reasons. Thanks for the clearification.

But Lepai is one of the cheapest ones so thats reason enough I guess.

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etc.

I am very interested in buying a detailed CAD drawing (or similar) aswell. Both to support you on the great work you have done so far and to be able to get a detailed drawing to hand over to the contruction supply store (Hornbach, Bauhaus or similar who cut their material for you at a reasonable cost) and have the main pieces cut up for me to get the precision needed and to save some work.
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Old 14th April 2011, 01:32 PM   #1067
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Hi Again :P

Which crossovers do you guys recommend??
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Old 14th April 2011, 01:35 PM   #1068
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Any TA202x amp will basically be the same, so it's up to you if you want something cheap or something that has better components and or build quality. Just remember, as far as I know, only the amp6b in the recommended enclosure will actually fit inside as intended.

There's a link a few pages back to the sketchup model. Or just go into sketchup and search for boominator or saturnus.

Cutting plan is pretty simple.

- 12mm 9 ply birch plywood
- trim all edges
- direction of grain is always lengthwise expect center brace
- calculated blade is 4mm
- first cut (after trim) is 900mm
- 2nd and 3rd cut is 276mm

From 1st cut
2x 900x300mm (side baffles)
2x 900x276mm (top/bottom)

From 2nd cut
4x 276x276mm (ends/centers)
1x 276x66mm (top spacer)

From 3rd cut
2x 276x393mm (center braces)
4x 276x92mm (port/handle pcs)

Last edited by Saturnus; 14th April 2011 at 01:47 PM.
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Old 14th April 2011, 01:39 PM   #1069
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Hi again :P

Which crossovers do you guys recommend???
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Old 14th April 2011, 01:41 PM   #1070
Nahaz is offline Nahaz  Sweden
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Nice to see it summed up like that but will it be the correct proportions with the drivers changing size etc?
I read that the drivers came in a new size somewhere in the thread and that some people had to make adjustments to make them fit, or did I missunderstand?
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