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New SMSL A300 BTL Class-d Power Amp
- Thread starter SMSL-Mandy
- Start date
Unfortunately the A300 does not have an auto standby feature. It can be operated using the remote control or the power button on the front panel.
I think that turning off the power by pressing these buttons puts the A300 into a sleep state. To turn off the power completely, operate the power switch on the rear panel.
I've purchased several SMSL, Sabaj, and Topping amps, but I've never seen one with an auto-standby function.
On the previous page I wrote how much it consumes. I took new measurements after everything was plugged in and used for a week. It consumes 2.1-2.3 watts (avg. 2.2W) with power OFF, avg. 5.1W with power ON. Foobar 0dB, DAC 99, A300 - 25 - it uses 5.2-5.5 watts.
Boxermotor
Member
The increased power of the A300 is tempting, but with a wonky volume knob and unbalanced inputs I think I'll pass on trying this one. For now I'll stick with my AO200 and C200 DAC/amp until a sub-$400 all-in-one DAC/headphone amp/power amp (with SW out) hits the market and scores near the top in every area. I expect Topping and SMSL will get there soon...
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SuperDerpBro
Active Member
Is there any info on the USB DAC anywhere? I cant seem to find it.
The A300 does not have a DAC chip for USB-DAC.
The S/PDIF signal from the USB input is input to the BT module and converted to analog using the DAC function for BT built into the BT module.
So the sound quality is almost the same as BT.
The USB input is just a bonus feature.
SuperDerpBro
Active Member
That sucks 
.. and thank you
.. and thank you
Don't be disappointed.That sucks
.. and thank you
The digital input of Class D amplifier products is usually a function using the BT module.
Doing so will improve the product image and sell better.
But presumably without the quality loss of the BT compression?
Then you have to wait for all-in-one Loxije Ax0 with MA5332 to appear. Even Chinese manufacturers don't shoot themselves in the foot by offering a full-fledged BT in a power amplifier.
A300 nice amp, even my old speakers really shine with him.
I haven't checked all BT modules, but BT modules have an external input mode, and you can input S/PDIF signals from USB/COAX/OPT to the D/AC section via I2S to obtain analog output.
The format at this time is often input at 48kHz/16bit like BT. I don't think there is any compression applied to the operation in this case.
However, there are models such as the Loxjie A30 that have a dedicated DAC chip without using a BT module.
So in this case it wont be the same sound as bluetooth, since it doesn't suffer the BT codec compression - it is just using the DAC in the BT module. So we need measurements of the USB output before we know how good (or bad) that is.
Their own measurements show 0.004% THD+N which is Sinad of about 88dB - which is not bad.
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The digital input sound is BAD, it's nowhere as close as good as any of my DACs or soundcard
to be honest I'd trust the manufacturers measurements before I trusted any inividuals sighted listening for the evaluation.
Well, companies have an economic interest in lying because it often makes them money. This has been discussed before too, and we are quite many who say the same thing.
DanielT
Major Contributor
A tip, the same amplifier chip as in the SMSL A300 is found in this amplifier module. If you are curious about it, here is the link:
audiosciencereview.com
Class D power amplifier module Merus MA12070
What do you think about this one? By the way the same amplifier chip found in: https://audiosciencereview.com/forum/index.php?threads/new-smsl-a300-btl-class-d-power-amp.34607/ https://www.aliexpress.com/item/1005002545644886.html ___...
audiosciencereview.com
The amplifier chip used in SMSL A300 is not MA12070.A tip, the same amplifier chip as in the SMSL A300 is found in this amplifier module. If you are curious about it, here is the link:
Class D power amplifier module Merus MA12070
What do you think about this one? By the way the same amplifier chip found in: https://audiosciencereview.com/forum/index.php?threads/new-smsl-a300-btl-class-d-power-amp.34607/ https://www.aliexpress.com/item/1005002545644886.html ___...
The A300 uses the same MURAS MA5332MS chip.
MA5332MS - Infineon Technologies
The MERUS™ MA5332MS multichip module offers the same or even higher output power as monolithic alternatives without a heatsink and 50 percent less footprint.
SMSL products using MA12070 include SA300, DA-6, DA-8s, DA-9, A100, AO200, and A12.
The products using MA5332MS are A300 and SabajA20a 2022.
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Zek
Major Contributor
- Joined
- Feb 17, 2018
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... and Sabaj A10a 2022...
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