-
WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!
O-Noorus D1 - TPA3255 PFFB Stereo Amplifier - Front Display, Tone Control (with bypass) and Remote
- Thread starter Guddu
- Start date
If the movement is clockwise with typical potentiometer, the volume knob just needs to be fixed on the shaft which just points to min. and max. sweep with restriction to both ends like traditional amplifier.
I dont know why they made simple thing complicated and confusiing.
i appreciate they went to the bother of getting this chart out
42v (?) 5a does 95w 8 ohm so possibly as 80w unit at 48v 5a?
42v (?) 5a does 95w 8 ohm so possibly as 80w unit at 48v 5a?
there's no ,main speaker cutoff
i dont think anyone does this in stereo units except for high end stuff like NAD M33s and the like and of course, home theater units.
i keep saying this is one of my main beefs with most manufacturers
i was only able to get good 2.1 integration if i chose my main speakers carefully... ie. i have two or three sets of speakers with main woofers in the 4-5in range that DO cut off at about 80hz and so therefore my test 8" subwoofer cuts IN at 80hz and so the integration is good.
but I would go further and say you kind of need to control the cutoff slope as well but that's a story for another day
i dont think anyone does this in stereo units except for high end stuff like NAD M33s and the like and of course, home theater units.
i keep saying this is one of my main beefs with most manufacturers
i was only able to get good 2.1 integration if i chose my main speakers carefully... ie. i have two or three sets of speakers with main woofers in the 4-5in range that DO cut off at about 80hz and so therefore my test 8" subwoofer cuts IN at 80hz and so the integration is good.
but I would go further and say you kind of need to control the cutoff slope as well but that's a story for another day
OP
Guddu
Addicted to Fun and Learning
- Joined
- Feb 10, 2020
- Messages
- 929
- Likes
- 837
- Thread Starter
- #108
There is no high pass filter on D1 or D3 amplifiers.
I would, in fact, say that sub integration with D1 isn’t an issue as its low passed to 80Hz already.
However, main speakers get full bandwidth and so integration becomes less flexible there and you are stuck with whatever speaker crossover can do for you.
most of the speakers i own have good bass response... i mean that's what we care about
the speakers i'm testing now are 6.5" and with the typical DEEP cabinet design you get very good bass response and i found these to be not well integrated with a subwoofer
you can sort of control it by backing the power to sub down a fair bit but its not perfect
BUT the D1/3 series is very good with my floorstanding speakers and large bookshelfs
the speakers i'm testing now are 6.5" and with the typical DEEP cabinet design you get very good bass response and i found these to be not well integrated with a subwoofer
you can sort of control it by backing the power to sub down a fair bit but its not perfect
BUT the D1/3 series is very good with my floorstanding speakers and large bookshelfs
I have figured out how the error occurs. If use T&P mode, which enables EQ the right channel dies completely. Left channel is OK, EQ works. Remote works, I can adjust volume.
If I enable BP mode both channels work, but even at level 1 volume out of 80 to amp plays way too loud. Also, the remote stops working completely. No EQ in this mode.
Why to bother if TI provided a public document with the design and implementation. It's not like they are Topping, Fosi or even Aiyima. LOLwondering why they didn't try to hide PFFB circuit
Guddu. You did not have this kind of issue with yours, right? Can you confirm that in BP mode there is no volume control? only in B&T mode the remote controls the volume?
I'm still waiting for mine, I think it arrives today. There was a delay leaving China customs because they though it had a lithium battery inside or something.
OP
Guddu
Addicted to Fun and Learning
- Joined
- Feb 10, 2020
- Messages
- 929
- Likes
- 837
- Thread Starter
- #114
I haven't had any channel imbalance or no audio issues with O-Noorus D1, it has some other minor issues like mild pop on using remote or potentiometer ON/OFF issues though which manufacturer said they have fixed in batches after mine.
Remote does not work in BP mode, only volume pot works by design.
I have posted detailed impressions here:
O-Noorus D1 [TPA3255 PFFB] Stereo Amplifier - User Impressions | Owner's Thread
Dear FMs, I am intending to post User Impressions & Observations here in this User Impressions | Owner's Thread. pls note that Amir's measurements & review of this amplifier is in queue and awaited. I created a thread on O-Noorus D1 which captures details like features, internal pics, quick...
audiosciencereview.com
Ok, so Bypass mode really bypasses the NJW1194 chip completely, that's why no volume control with remote. Interesting, it still uses the pot to control volume but bypasses the NJW194 chip.I haven't had any channel imbalance or no audio issues with O-Noorus D1, it has some other minor issues like mild pop on using remote or potentiometer ON/OFF issues though which manufacturer said they have fixed in batches after mine.
Remote does not work in BP mode, only volume pot works by design.
I have posted detailed impressions here:
O-Noorus D1 [TPA3255 PFFB] Stereo Amplifier - User Impressions | Owner's Thread
Dear FMs, I am intending to post User Impressions & Observations here in this User Impressions | Owner's Thread. pls note that Amir's measurements & review of this amplifier is in queue and awaited. I created a thread on O-Noorus D1 which captures details like features, internal pics, quick...
View attachment 369268
The datasheet recommends to mute the amp before changing between modes:
Let's see if I get one from the new batch.
There are some but not many. Smsl a300, emotiva ta1, wiim amp (and these newer to be released units too) and there's a unit from rsl, dayton audio... I also can't understand why stereo units with sub out don't have hpf. It should be mandatory! lpf is actually useless in most instances as this can be controlled in most subwoofers themselves. Wiim Ultra would be a really nice pairing with this unit. A great all-in-one (two actually) system. Wiim amp pro seems like a good option but a bit underpowered maybe.
Similar threads
- Poll
