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Class D Switching Power Amplifiers and Power D/A conversion

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Old 15th April 2012, 12:11 PM   #2711
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Quote:
Originally Posted by Saturnus View Post
Of course. If you make the centerbrace without holes and have separate reflex ports on each side, it would be possible. I'd still not recommend it though.
Indeed. But i think i'll just ditch it. The plan were to make it double as a home stereo system (where i dont need 360* audio covering). But since the main purpose is to use it at Roskilde, im just going to ditch the idea. Thanks for the help
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Old 16th April 2012, 12:37 PM   #2712
gmarsh is offline gmarsh  Canada
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Originally Posted by Saturnus View Post
Of course. If you make the centerbrace without holes and have separate reflex ports on each side, it would be possible. I'd still not recommend it though.
What are your thoughts on a center brace without holes, and driving the "back" side of the box with music that's lowpassed at maybe 200-250Hz?

Thinking of a new mode of operation for the DSP card.
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Old 16th April 2012, 07:14 PM   #2713
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Hello everybody!
I'm new here, i started lurking this post some time ago, but it's sooo long, and i can't find the info i needed reading random pages of it!
I'm setting up a solar-powered stereo and i'm stuck at the amp!!!
Obviously i'm looking for a high power efficient digital amp. This have to be powered by the solar cells i already have. I've got more than one, quite powerfull, but they're not identical, i cannot use them in series so i'm stuck at 12V!!!
I was thinking about one or more TA2024 or similar for the mid-high tones, and this should be pretty fine (right?)! Now, i'm looking for a bit more powerfull low (maybe sub?) tones. But it's hard to find something that sounds good(read: loud) at 12V! Have you got any suggestion?
I found some TK2050 based boards that have rated voltage 10-32V, and claims 2x100W@4ohms.
BUT: would this TK2050 sounds louder than a TA2024 even on 12V?

OR: are there some other product that suits my needs and that i've missed?

I've also found some "class d/b" car amplifier made by rockford fosgate that claim high power efficiency and high spls at 12V, but they are kinda over powered and overpriced for this project!

Please help me!!!
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Old 16th April 2012, 08:54 PM   #2714
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PinkNoiser,

There is a theoretical limit to how much power you can get in an amplifier running on 12 v. The Tripath 2020 is about the limit at 15 wpc or so. Car amps work by using a switched mode power supply to raise the voltage, but these are going to suck some efficiency, too. There is a discussion here some months ago about running 2050 amps off 24 volts, but many who are building with that capability are putting a switch so they can drop down to 12v for efficiency's sake, as most people don't like the music super loud all the time.

Reports from those who have heard the Boominator are that it is LOUD. Efficient speakers make a huge difference, turning more of your amp's energy into sound. A small increase in dB makes a huge change in volume.

Go ahead and build one with a 2020. If you don't think it's loud enough, then you can switch to an electronic crossover (don't forget that this will suck some power too) and just use the 2020 for the highs.

--Buckapound
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Old 16th April 2012, 08:58 PM   #2715
Brotaku is offline Brotaku  United States
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Quote:
Originally Posted by PinkNoiser View Post
I was thinking about one or more TA2024 or similar for the mid-high tones, and this should be pretty fine (right?)! Now, i'm looking for a bit more powerfull low (maybe sub?) tones. But it's hard to find something that sounds good(read: loud) at 12V! Have you got any suggestion?
I found some TK2050 based boards that have rated voltage 10-32V, and claims 2x100W@4ohms.
BUT: would this TK2050 sounds louder than a TA2024 even on 12V?

OR: are there some other product that suits my needs and that i've missed?

Please help me!!!
IMHO you didn't miss anything. I use many tripath amps and the TK2050 gives a great, clean 50w @8ohms and 100w @4 ohms. it is very loud and it works at 12v. i power it with 14.7v li-poly batteries i buy from hong kong via ebay. these actually charge up to 16.8v. i like how this amp takes a wide range of voltages perfect for these batteries. These are durable amps. I use them on bicycles and they hold up to vibration! You can use this for your subs but i use these for everything when i go loud. I have not found its equal nor better.

Last edited by Brotaku; 16th April 2012 at 09:03 PM.
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Old 17th April 2012, 10:23 AM   #2716
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Many thanks for your faste replies!!!
Buckapound, i'm aware about the physical limits about SPL, for the istance, i would be satisfied even if the tk2050 is not worse than a 2024 in the same configuration.

So, if there aren't better alternatives, I think i will buy both 2024 and 2050 amps, due to the small costs. I will try both, eventually powering tweeters with 2024 and woofer with 2050, or just with 2050 (in this case i can eventually boost my system if not solar powered, with a 32VDC supply)

3 more questions now:
  1. I live in italy. Thats explains pretty much everything: why I want a solar powered stereo, why my english is so bad, and why I'm having hard time finding a close suppliers for equipments. I've planned to buy some assembled kits from Sure Electronics, shipped directly from china. Is this a bad idea? Do you know some better dealer, located somewhere in Europe? Do you think that shops like 41Hz would be better?
  2. Efficient speaker: the 360 layout doesn't suits my needing, so no magnet to magnet solution... I have no clue about high sensitivity speaker, not costy and shipped in urope with ease. Any advice? Maybe i could buy 4x 8ohm speaker and use 2 for each channel, this would increase efficiency? I've also seen some high sensitivity open baffle speaker. They have lots of cons (like 360 sound that is not fine for me), but also some pro: a well designed solution with open baffles would be very portable. Need you suggestions.
  3. Crossovering i was thinking 'bout active crossovers, with the hope that they would be more efficient than a passive solution. I would eventually build them by myself from spare components. Are there best alternatives? What about using a DPS? Would be good? Would be better? How much would i spend?
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Old 17th April 2012, 10:28 AM   #2717
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Quote:
Originally Posted by Brotaku View Post
IMHO you didn't miss anything. I use many tripath amps and the TK2050 gives a great, clean 50w @8ohms and 100w @4 ohms. it is very loud and it works at 12v. i power it with 14.7v li-poly batteries i buy from hong kong via ebay. these actually charge up to 16.8 [...]
Could you do some testing for me? It would be great if you should test TK2050 at different voltages with the same input level, and tell me how much the spl vary...
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Old 17th April 2012, 01:55 PM   #2718
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Default Fake KSN1001A tweeters?

Hey Diy audio!

I just recieved my motoral KSN1001A tweeters from the US.

But i noticed that something has been "removed" from the back ? Could theese tweeters be fake ?

Here is a picture

Click the image to open in full size.
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Old 20th April 2012, 09:06 AM   #2719
LukasL is offline LukasL  Denmark
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Hey Boominator-fans.
I am thinking about making a "boominator" with these speakers: JB systems SP10/150. 10'' bas
, if i can somehow calculate the size of the box when mounted bipolar.

Do anyone of you have any experience with these speakers?
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Old 20th April 2012, 09:47 AM   #2720
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Quote:
Originally Posted by LukasL View Post
Hey Boominator-fans.
I am thinking about making a "boominator" with these speakers: JB systems SP10/150. 10'' bas
, if i can somehow calculate the size of the box when mounted bipolar.

Do anyone of you have any experience with these speakers?
They can't be used.
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