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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th February 2013, 12:27 PM   #3471
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Quote:
Originally Posted by stevodude View Post
I have proceeded to glue the front/back baffles in.

Click the image to open in full size.

I still have some wiring to sort out. Mount Batteries and Amp in the space, route the edges, and a final 3 or 4 coats of clear, some corners and 1 Boominator ready for a PARTY!
Looks great. About the routing, aren't you worried about seam weaknesses from thinning the wood on the corners? What bit are you planning to use?
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Old 26th February 2013, 01:12 PM   #3472
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Location: Whitstable, Kent, England
Looking good stevodude, I like your circular, brushed aluminium control plate idea and I think that I would like to do something similar for mine.

However, I want solar charging with backup 12v charging input, I like your led battery indcator but I would prefer to add an old school, round VU meter. I remember Saturnus considering that for one of his projects, any details would be most appreciated because the electronics side of building a boominator is my weakest area....

Good news today tho.... I received my HP10W's from Intertechnik in Germany......
Very good service, I ordered them online only 6 days ago, paid by PAYPAL and they arrived today..... I couldn't ask for more....
I hope my order for the piezo tweeters from the USA goes as smoothly........

Now to do some more cutting, routing and glueing......

next purchase will be piezos and AMP6 when I can afford it.......

Looking forward to stevodudes report on how his beast sounds (although I have a feeling that you may have vibration problems with your "loose" boominator top).....

BJ
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Old 26th February 2013, 01:59 PM   #3473
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Wow.......

Just researching the costs of the Piezo Source KSN1001A....... the shipping alone to the UK is going to cost $150... WTF.....

Total costs with 4 tweeters and shipping is looking like around 130.... that is a lot of money for four piezo's..... anybody got any better suggestions? that shipping is outrageous.......

BJ
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Old 26th February 2013, 03:07 PM   #3474
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Yeah. It's outrageous. And import duties are probably on top of that as well.

Not much that can be done. They are the ones who make the original, and they can charge whatever they like (as does it seems).

You can just decide you're not going to pay it and settle for a reasonable quality replica like the Monacor MPT-001. Or you can go with a regular driver like the p.audio PHT407N and use a regular crossover (posted elsewhere). That'll be 80 from bluearan plus parts for the crossover.

Last edited by Saturnus; 26th February 2013 at 03:09 PM.
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Old 26th February 2013, 09:50 PM   #3475
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Thanks Saturnus.... I'd rather not compromise the top end.... I'd prefer to go with the PHT407N than the monocore.... As I say, the electronics side is not my strong point. Isn't there an impedance issue with the AMP6b using regular compression drivers? I'm not to worried about wiring in crossovers as long as I don't have to actually design them (beyond my current capability) but my understanding is that regular drivers would take the impedance down from 4ohms to 2ohms?
BJ
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Old 26th February 2013, 10:02 PM   #3476
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Quote:
Originally Posted by brummiejon View Post
I'm not to worried about wiring in crossovers as long as I don't have to actually design them (beyond my current capability) but my understanding is that regular drivers would take the impedance down from 4ohms to 2ohms?
The PHT407Ns are the ultimate in sound quality that you can get for what I think is reasonable to spend for drivers for this purpose.

Your understanding is wrong. The whole purpose of a crossover is to split the frequencies up in separate parts so the amplifier only sees the same impedance.
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Old 26th February 2013, 10:17 PM   #3477
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So I can use PHT407N's and as long as I add a suitable crossover, the impedance of the hp10's plus the PHT407N's will still be 4ohms and ok for the AMP6b? I'd better start trawling this forum again for suggested crossover designs....
BTW Saturnus, I probably speak for many but thanks for the ongoing support...
BJ
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Old 27th February 2013, 05:05 PM   #3478
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Hello there, I am just about ready to start building a Halfinator, with a design I blatantly stole from one of the pictures on the facebook fan page.
But before building, I just wanted to ask if the design in any way conflicts with the original idea, especially regarding the bass reflex port which is 10mm. I picked this design because i thought i looked amazing, but now I'm wondering whether it is too big?
Wouldn't want my hunt for good looks to conflict with the actual performance of the thing.
- Thank you in advance

Click the image to open in full size.
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Old 27th February 2013, 08:38 PM   #3479
Svampan is offline Svampan  Denmark
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@mrtmnrsmssn

2 reflexports may be symmetrical, but is not the way to do it, there's one in each chamber of the original. If you go through the thread, saturnus strongly recommend to use the original handle/port design. I've seen people use plastic ports, and I think the diameter was 78mm don't know about the length.

Quote:
Originally Posted by brummiejon View Post
So I can use PHT407N's and as long as I add a suitable crossover, the impedance of the hp10's plus the PHT407N's will still be 4ohms and ok for the AMP6b? I'd better start trawling this forum again for suggested crossover designs....
BTW Saturnus, I probably speak for many but thanks for the ongoing support...
BJ
If you want to use the PHT407n Saturnus recommends using a miniDSP with an amp9b. As far as i know (and please correct me if I'm wrong) it's due to the amp9 being 4 channels, which is then controlled by the minidsp. the impedance at 4 ohm has nothing to do with crossover, but is the result of paralleling the speakers in pairs on each channel.

I'll try to make a diagram, as I've been unable to find any, eventhough the tweeter + hp10w design is a rather common idea, to get it confirmed.

Have I understood it correctly if I adjust the minidsp to:

- cut off frequencies below 100hz (as it's a waste of power outside)
- give the tweeter channels -3db to fit the output of the hp10w at 96db
- make the crossover at 2250hz

I am going through the thread a third time, and I still feel like I have a lot to learn
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Old 27th February 2013, 08:49 PM   #3480
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Does anyone have experience with a Tip31 transistor?
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