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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th December 2010, 02:45 PM   #781
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Quote:
Originally Posted by zerokelvin99 View Post
you mention the amp power being limited by the the laws of physics - but this class D amplifier Class D Audio TI-300 Amplifier - PRODUCTS

(another candidate, as mentioned earlier on in the thread - further up the page) puts out more power than the amp9, i take it pushes the voltage rails higher than Vsupply for the amp?
Nope. It doesn't have a built DC-DC converter so it outputs exactly the same as the 2x100 Sure or the amp9b which in all cases is:

RMS output = supply voltage squared / double the impedance * efficiency

Wrms @ 24V into 8 ohms = 24 x 24 / 8 + 8 * 83% = 30Wrms per channel
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Old 29th December 2010, 03:33 PM   #782
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Quote:
Originally Posted by Saturnus View Post
Nope. It doesn't have a built DC-DC converter so it outputs exactly the same as the 2x100 Sure or the amp9b which in all cases is:

RMS output = supply voltage squared / double the impedance * efficiency

Wrms @ 24V into 8 ohms = 24 x 24 / 8 + 8 * 83% = 30Wrms per channel
ah haa, thanks!

looks like 36v, and 4ohm is the way to go then
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Old 30th December 2010, 08:16 PM   #783
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another question about your driver choice:

why piezos?! aside from the lack of passive XO needed, a cheap 1" comp driver will give you at least another 10db+ sensitivity.. even a FPT / APT80

surely the best option would be a PLLXO combined with a 1" on the relevant horn....

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Old 20th January 2011, 09:02 AM   #784
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hi, i would like to hear if any of you guys have some suggestions for an assembled ta2020 amp, i see the assembled amp6 at 41hz is out of stock atm.
but i basically want a board for the same setup as saturns' box in terms of speakers, batteries, solar panel..
I saw alot of people had problems with the cheap lepai boards dying but was looking at something like these and wanted to hear if you have any opinions in terms of do's and dont's

MKIII Tripath TA2020 PCB 25watt Class-T amplifier
or this
Tripath TA2020 PCB 25Watt Class-T Audio Amplifier Board

or maybe something totalt different ..
thanks.
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Old 20th January 2011, 02:20 PM   #785
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At 10 for an TA2020 board I think there's no competition. You should definitely try it out in my opinion.
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Old 20th January 2011, 05:04 PM   #786
zubzer0 is offline zubzer0  Denmark
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Quote:
Originally Posted by Saturnus View Post
At 10 for an TA2020 board I think there's no competition. You should definitely try it out in my opinion.
I have been using that 10 TA2020 (red PCB) for months now and it works and sounds really great

I build a small pair of stereo speakers for my PC (using a pair of Monacor 3'' fulltone speakers, SPH-30X) and I use the red TA2020 Amp to drive them and I think they are a perfect match.

Click the image to open in full size.

I also have a Lepai for experimental use
The Lepai sound quality is poor compared to my other TA2020 but the Lepai has a bit higher input gain so I might use it for a festival boombox

Click the image to open in full size.
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Old 22nd January 2011, 03:40 PM   #787
Eres is offline Eres  Denmark
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Default The PHT407N P.audio driver

Quote:
Originally Posted by Saturnus View Post
Boominator Signature recommended parts:

Woofers: P.audio SN10MB series II (no alternatives)
Tweeters: P.audio PHT407N (or similar high dispersion, high sensitivity and high quality tweeter horn)
Amplifier: 41Hz Amp9basic (or other 4 channel Tripath based amp)
Filtering: active at 2.4KHz with passive correction (or mix PLLXO and passive filters)
Batteries: up to 3 12.8V 6.8Ah LFP packs (no viable alternatives to the LFP pack, they're superior in every way to any other battery type)
The P.audio PHT407N tweeter has a power handling of 20 watt. Will that be enough when comparred with the Amp 9 basic? That has a output with 50W.
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Old 22nd January 2011, 04:56 PM   #788
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Actually the amp9 outputs roughly 60W into 4 ohms at 24V supply voltage. Each speaker will see half that, so only 30W per speaker. The 20W power handling is RMS, it will never see more than about 2W of continuous output.
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Old 23rd January 2011, 10:04 PM   #789
ThokN is offline ThokN  Denmark
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Hello again.

I've been waiting for this for half a year...now we are beginning on our new Boominator for Roskilde '11

We'll start out slow though by discussing features, so one question:

Do you have any detailed plans on a subwoofer for you Boominator?

I've searched the thread, but only found old entries. What do you think of an external Horn Subwoofer to go with the Boominator? Do you know of any pros and cons?

I'm afraid that it will be a too 'directed' sound, and I'm not sure if that is good enough in an open space.

I see that you mention that you have planned to use a passive sub, but with it's own batteries. Does this mean that there will be an output cable from the Boominator's amp to the sub, and a power cable from the sub to the Boominators batteries? How much will this effect the loudness of the music overall?

I'm thinking about installing a 1-channel amp in the subwoofer to make it active, and therefore not lowering the output of the Boominator itself.

Any thoughts on this?
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Old 23rd January 2011, 10:46 PM   #790
ThokN is offline ThokN  Denmark
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Default Some images

By the way, look at all the joy the Boominator can bring


Click the image to open in full size.
@Roskilde. In '10 we build a wagon of an old wheelbarrow with two compartments isolated with polystyrene(?) (Flamingo in Danish) to keep a lot of beer cold and within reach.

Click the image to open in full size.
@Roskilde. In '10 we added a signal-split mini-jack output for the other Boominators to hook up to. Here two of them are playing together. Some known DJ played a set on it a bit later.

Click the image to open in full size.
We are three camps, and each of us have our own self-build Boominator. All playing the same signal in one chain. Taken just before:

Click the image to open in full size.
Outdoor party in a park in Copenhagen. ~100 people, probably more.

Click the image to open in full size.
Party in the park.

Click the image to open in full size.
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