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Class D Switching Power Amplifiers and Power D/A conversion

Class D amplifier - DIY modules recomendation
Class D amplifier - DIY modules recomendation
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Old 9th February 2019, 01:24 PM   #1
ilcaccillo is offline ilcaccillo
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Join Date: Apr 2012
Default Class D amplifier - DIY modules recomendation

Hello,
I would like to buy 2 Class D amplifier modules (just the pcb with components) to drive the following speakers:


Woofer

220w RMS
440w PEAK
2ohm
38Hz – 1.8kHz


HF Driver
35w AES
8ohm
1.9k-20kHz


What are your recomendations in terms of already assembled boards that I could buy for these speakers?


thank you so much
best regards

Last edited by ilcaccillo; 9th February 2019 at 10:49 PM.
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Old 9th February 2019, 09:18 PM   #2
FauxFrench is online now FauxFrench  France
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Quote:
Originally Posted by ilcaccillo View Post
Hello,
I would like to buy 2 Class D amplifier modules (just the pcb with components) to drive the following speakers:
Woofer
220w RMS
440w PEAK
2ohm
38Hz – 1.8kHz
HF Driver
35w AES
8ohm
1.9k-20kHz
What are your recomendations in terms of already assembled boards that I could buy for these speakers?
It is probably the amplifier for the woofer - 300W in 2 Ohm - that puzzles most of us.
As a good amplifier for the HF driver (35W/8Ohm) I can propose a TPA3250 based amplifier. High quality sound.
300W in 2 Ohm means high current levels. For car audio this is trivial, for HIFI/audiophile use much less. Perhaps a IRS2092 based amplifier with low impedance switches. Or, if you can find a TPA3255 based mono board with PBTL coupling.
You are not afraid of a sound-level imbalance with such a powerful woofer?

Last edited by FauxFrench; 9th February 2019 at 09:24 PM.
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Old 9th February 2019, 10:55 PM   #3
ilcaccillo is offline ilcaccillo
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Quote:
Originally Posted by FauxFrench View Post
You are not afraid of a sound-level imbalance with such a powerful woofer?

Hi, thank you so much for your help.


Unfortunatly it's the speakers I have, they are JBL EON 315 (PA/Stage monitor speakers) that have failled amps. those amps are crappy and prone to failure so I ditch them, and will power the speakers from a DIY Class-D amp assembled with modules.



The woofer in these JBL EON 315 is model JBL M115-2 rated at 220w RMS at 2ohms.
So I guess I need to find a class D module that is able to work at 2ohms, can't seem to find one



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Old 9th February 2019, 10:58 PM   #4
ilcaccillo is offline ilcaccillo
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Quote:
Originally Posted by FauxFrench View Post
As a good amplifier for the HF driver (35W/8Ohm) I can propose a TPA3250 based amplifier. High quality sound.

Do you know a webstore or model I could buy?
what could be your recomendations for modules using the TPA3250?


Thank you
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Old 10th February 2019, 12:24 AM   #5
FauxFrench is online now FauxFrench  France
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Location: The mountains, calm and quiet.
Hi,
I will suggest you to look at the modules from Sure Electronics and 3e Audio. With the power you need for the woofer, I will recommend you to buy from manufacturers that are known for more solid designs.
The Sure Electronics pdf document includes in the beginning an overview of their boards. Here it is easy to find a board for your needs.
TPA3250 boards (without chassis) are more rare but 3e Audio has that.
Personally, I have none of these boards because I chose to settle with a significant lower power level my wife accepts.
Sure Electronics' webstore Mono Series
http://sure-electronics.net/Sure%20E...t%20Manual.pdf
TPA3255-1CH-480W | 3e Audio
TPA3250-2CH-50W | 3e Audio

Last edited by FauxFrench; 10th February 2019 at 12:27 AM.
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Old 10th February 2019, 01:12 AM   #6
ilcaccillo is offline ilcaccillo
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Hi,
thank you so much for the links.
The Sure store has a lot of offerings, nice to know.
On the website is a bit hard to search for a specific amplifier module but the pdf you sent really helps on that.


I selected 2 amps that work at 2ohms for the woofer,

what do you think of these?



This one seems to have the right power but THD seems a bit high at 300w:


TAS56XX Series 1 X 300 Watt 2 Ohm Class D Audio Amplifier Board TAS5613
AA-AB31191


http://store3.sure-electronics.com/1-x-300-watt-class-d-audio-amplifier-board-tas5613






or this one, has more power but will less less THD at 220W:





http://store3.sure-electronics.com/1-x-600-watt-2-ohm-class-d-audio-amplifier-board-tas5630

1x600w
Output Power

600W@2Ohm 48V DC THD+N 10%

350W@2Ohm 48V DC THD+N 1%






__________________________________




For the HF Drivers, this amp seems good enough,
I saw the amps at 3e-audio, they look pretty good but the "Buy it Now" button doesn't work, so I can't see the price, it seems theres something wrong with the website



STA5XX Series2 X 100 Watt 4 Ohm Class D Audio Amplifier Board -STA508(AA-AB32186

Sure Electronics' webstore 2 X 100W Class D Audio Amplifier Combo Kit w MW 24V 200W Power Supply STA508

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Old 10th February 2019, 02:26 AM   #7
bwaslo is offline bwaslo  United States
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Class D amplifier - DIY modules recomendation
These are rated to handle 2ohm load (as the miniumum). I've not used this paraticulare one, but have a 250ASP running 2 4ohm coils in parallel without issues --
ICEpower 500ASP Class D Audio Amplifier with Power Supply Module 1 x 500W

A big advantage of most ICEpower amps is they include the power supply so it takes almost no time to get one oup and running.
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Old 10th February 2019, 02:44 AM   #8
ilcaccillo is offline ilcaccillo
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Hi Bwaslo,
thank you so much for your recomendation, although the price is much higher than the Sure options.


Well maybe the quality is much better than the Sure product, I'm just a newbie on this stuff, also the PSU is included but even with an external PSU the Sure untis are 1/3 the price of the IEC


Thank you
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Old 10th February 2019, 08:58 AM   #9
FauxFrench is online now FauxFrench  France
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Quote:
Originally Posted by ilcaccillo View Post
Hi,

I selected 2 amps that work at 2ohms for the woofer,

what do you think of these?
Of those I would prefer a TAS5630 based amplifier to a TAS5613 based amplifier simply because the TAS5630 chip has more power reserves and presumably better power handling stability.
When you pull 300W in 2 Ohm from a single chip amplifier the currents are (very) high and stability is an important issue.
I would worry less about still good THD levels because it is for a woofer that will not reproduce much of the higher frequencies from eventual amplifier distortion and how much distortion do you think your woofer will contribute with at that power level?
I guess you do it for the bass "kick" rather than the subtle sound.

I can do maximum 2x100W (8 Ohm) with any of my amplifiers so I have no experience at that power level.
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Old 10th February 2019, 11:03 AM   #10
ilcaccillo is offline ilcaccillo
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Thank you so much,
I will follow your recomendations.


Are you able to see the 3e-audio prices in your browser?
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