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It would be extremely useful to have the possibility to set a cut off frequency lower than 70 Hz for the SW output It is technically possible to design a Class-D amplifier that directly accepts an analog input (including a basic PWM design)...
Sabaj A30a announced | Headphone Reviews and Discussion
However, unlike technical matters, sound preferences differ from person to person. I can't say for certain that the sound quality will improve. Hello peterwen. Thanks for posting. I have a question: is the sub low pass complemented with a high pass filter for the mains?. If yes, is the high pass frequency adjustable like the sub cut out frequency? Using the latest DSP chip with ST high-power amplifier chip, carefully designed and debugged, its distortion is as low as 0.0008%; To your question, "Is there a significant improvement in perceptual/subjective sound characteristics?", my subjective opinion is yes. I'd tried to pair the digital amplifier Sabaj A30A via the USB-C input with a Raspberry Pi Zero 2W loaded with Picoreplayer 8.3.0 as a streamer (digital source). I used Pi -> micro-USB OTG -> male USB-A to male USB-C -> Sabaj A30A. With OTG cable in the chain Sabaj could display 44.1 on the USB display (with a single cable micro-usb to usb-c it could not) But the Pi continue to be unable to see the Sabaj. (aplay -l show me no soundcard) I think it is maybe a setting output problem or a problem related with the micro-usb - usb-c chain. Any help?Built-in multiple EQ modes and high/bass adjustment functions to easily match various speakers and music; It’s ridiculous to have 20 or so EQ settings without knowing their effect on the frequency response SABAJ A30a Power Amplifier 200W*2 Axign AX5689 XU208 DSD512 Bluetooth LDAC Apt-X HD AAC For Passive Speaker & Active Subwoofer
SABAJ A30a Integrated Professional-Grade Hi-Fi Power
there's only bass/treble despite the capability of having more eq. We need at least a definition of what each EQ setting is - though most sound pretty bad. Not a major issue, since many sources now have powerful PEQ, or at least GEQ. To be honest I was not surprised. if anything Chinese makers (not just audio) have been flooding the market with model after model with quite big overlap between those.
Connectivity & Bluetooth 5.0
The Dali Zensor 3 have been so far connected to a 1984 Marantz PM 550 DC amplifier and a few times to a (24 kg!!) Rotel RSX-1067 and a Denon DRA 800H. And this is still the case for the actual loudspeaker transducers inside "powered speakers" that have amplifiers built into them... No hums of hiss when no music is playing (I didn't investigate the matter at length by cranking the volume all the way up) Design & Build Parts Electronic Design Equipment & Tools Construction Tips Software Tools Build Guides I did also BRIEFLY connected the Sabaj to my Elac Vela BS403 (that I usually drive with my Denon DRA800 H stereo receiver) and I cannot say I detected a significant improvement over the Denon (maybe the bass are a little bit more tight with the Sabaj than with the Denon). However this is a very preliminary analysis considering that I had to move the Velas on the other side of the room to connect them to the Sabaj.
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