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ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth
ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth
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Old 6th January 2020, 02:56 PM   #1
lutkeveld is online now lutkeveld  Netherlands
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Default ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth

I want to introduce a new product I have been working on for the past years.
It's now available for pre-ordering, which will be shipped in the end of februari, in order of payment.

ZOUDIO AIO4CH: 4-channel amplifier with DSP and Bluetooth

Click the image to open in full size.

Features:
-4x45W class D amplifier (can also be configured as 2.1 or 2.0)
-Bluetooth V4.2 APT-X with True Wireless Stereo
-Configurable DSP
-Easy to use Windows configuration tool
-Small format with high efficiency

Screenshot configuration tool:
Click the image to open in full size.

As can be seen, a lot of the settings can easily be changed, such as:
-Start and maximum volume
-Battery protection voltages
-Input (left/right/mono) and output (4.0/2.1/2.0) configuration
-13 general filters (equalizers) en 5 filters per channel (crossovers)
-2 equalizers which can be enabled with a button (e.g. indoor/outdoor, bass-boost)
-Volume dependant (dynamic) equalizer
-Delay per channel

This thread can be used for questions about specifications and how to use the products. Remarks and suggestions for improvement are also welcome for this and future products.

Productpage (datasheet, configuration tool download, ordering): click here
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File Type: jpg IMG_20200104_134718.jpg (445.6 KB, 1574 views)
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Old 6th January 2020, 03:29 PM   #2
CharlieLaub is offline CharlieLaub  United States
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You say "...5 filters per channel (crossovers)". What crossover filter types will the user be able to select from?

Are shelving filters one of the EQ or crossover filter types available? First and second order shelving?

From the spec sheet I see THD+N @ 1W listed as 0.05%. It's more important to know the noise floor, since that influences whether high sensitivity drivers can be used like a CD+horn. What is the measured/expected noise floor of the system?

Can you provide more info on the amp section please? "4x45W" in this day and age really doesn't tell you much. Is that at 10% distortion, 1%, into 8R/4R/2R, with what rail voltage, etc. etc. This will determine how well the amp will work with low sensitivity drivers that need more power.

Thanks for posting about the product, it seems interesting enough to want to know more about it in detail.
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Old 6th January 2020, 03:31 PM   #3
oon_the_kid is offline oon_the_kid  Malaysia
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Hi there,

Looks interesting, seeing that this is a diyaudio forum. We will be interested in a bit more of the technical specs... Such as
1) what chip for the class D amp?
2) does it have digital inputs
3) what chip for the dsp?

Oon
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Old 6th January 2020, 03:35 PM   #4
lutkeveld is online now lutkeveld  Netherlands
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@CharlieLaub
The filters are biquads:
-1st/2nd order HPF/LPF
-Bass/treble shelf
-Notch/peak

The chip thats used is the TAS5825M. The implementation is almost identical to the TI EVM, of which the measurements can be found here: http://www.ti.com/lit/ds/symlink/tas5825m.pdf

I have yet to measure the actual distortion levels of this board.

@oon_the_kid
The amplifier is the TAS5825M, which also handles the DSP. The amp input is I2S, which comes from the BT module, but is also broken out via a 3-pin female header.
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Old 7th January 2020, 08:02 AM   #5
oon_the_kid is offline oon_the_kid  Malaysia
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Lukteveld,

Very interesting product you have there. I have always been looking to get something like this to appear on the horizon. Was considering getting the EVM for one of the TI all digital chip at one time.

Likely to get one.

Have a few more question:

1) If I understand it correctly, input is by I2S. That means I would need a Spdif/toslink to I2S converter for it to accept input from either of these sources?

2) How do you switch input so that it can switch from Bluetooth to the external I2S (Spdif/Toslink)?

3) There also seems to be a 3.5mm input, is that analogue input?

4) Does it have any analogue line level output? That I could connect to a subwoofer.

Oon

Last edited by oon_the_kid; 7th January 2020 at 08:04 AM.
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Old 7th January 2020, 08:14 AM   #6
lutkeveld is online now lutkeveld  Netherlands
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The input stream is provided by a bluetooth module. Its either a bluetooth stream or the analog input (usually 3.5mm jack), but a header for I2S is provided if you want to hook up an external digital source.

Seamless switching from bluetooth to an external I2S source is not supported. Either the bluetooth module provides I2S, or you disable it and let an external source provide I2S
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Old 7th January 2020, 08:51 AM   #7
cph2000 is offline cph2000  Denmark
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Very nice!
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Old 7th January 2020, 10:15 AM   #8
oon_the_kid is offline oon_the_kid  Malaysia
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Quote:
Originally Posted by lutkeveld View Post
The input stream is provided by a bluetooth module. Its either a bluetooth stream or the analog input (usually 3.5mm jack), but a header for I2S is provided if you want to hook up an external digital source.

Seamless switching from bluetooth to an external I2S source is not supported. Either the bluetooth module provides I2S, or you disable it and let an external source provide I2S
How do we go about doing it? By using a DPDT switch or something like that. BTW, not sure what bluetooth chip you are using in your using. If it is Qualcomm CSRA64215, Spdif is already built in, just need to program it.

Oon
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Old 7th January 2020, 11:45 AM   #9
nuno cesar is offline nuno cesar  Portugal
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Hello. From were will be the amp shipped?

I'm looking for a stereo amp with volume , bass and treble control. Is possible?
Thanks
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Old 7th January 2020, 12:38 PM   #10
oon_the_kid is offline oon_the_kid  Malaysia
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Quote:
Originally Posted by lutkeveld View Post
The input stream is provided by a bluetooth module. Its either a bluetooth stream or the analog input (usually 3.5mm jack), but a header for I2S is provided if you want to hook up an external digital source.

Seamless switching from bluetooth to an external I2S source is not supported. Either the bluetooth module provides I2S, or you disable it and let an external source provide I2S
Is there any line level analogue output that can be used for subwoofer?

Oon
 

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