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Loxjie A30 Amplifier Review

taloyd

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Apologies for the unwarranted snark. Nyquist Sampling Theorem suggests that the sampling rate only needs to be double the frequency to faithfully reproduce a waveform, even a complex one. Half of 48kHz is still above human hearing, the upper range of which reduces with biological aging. So for humans, 48 kHz is enough to reproduce everything that we can hear. It also can be evenly divided into (downsampled) from 96 or 192 kHz, and so higher sampling rates can be downsampled without error down to 48 kHz - meaning that as far as the receiving end (human hearing) 192 kHz sampling will work just fine with a good 48kHz sampling rate DAC, ie: the downsampling is "lossy" in terms of bitrate, but "lossless" in terms of human hearing.

Of course one of my favorite expressions: In theory there is no difference between theory and practice - but in practice there is.
 

maxp

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You could get a USB to Toslink adapter and see if you hear a difference?
Minor update, I've hooked it up to a DOUK U2 USB, and to my surprise it supported optical @ 192 kHz @ 24bits.
I haven't done any B2B testing yet, but I can say it does sound excellent.


PXL_20221017_080751843.jpg
 
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azeqsd

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too bad there is no automatic or quick source selection :/

what would be the recommendation for USB/BT use ? Aiyima D03 ?
 

jeolab

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Hello there!
I've recently purchased a Loxjie A30 and I'm experiencing some issues with it that I can't explain.
When I'm listening to a Vinyl record (with an LD PPA 2 preamp) on my Dali Spektor 2's, the sound is heavily distorted, especially the bass. However, when I switch to the Headphone out and listen to the same track on my headphones, the audio sounds great! When I play the same track via Bluetooth, the sound over the speakers is clean! So all combinations sound good (BT-Speaker, BT-Headphones, Phono-Headphones), except for one (Phono-Speakers). Has anyone experienced anything like this?
 

Drengur

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So all combinations sound good (BT-Speaker, BT-Headphones, Phono-Headphones), except for one (Phono-Speakers). Has anyone experienced anything like this?
This is a weird problem to have. There are people here who are probably better at identifying the problem than me, but in the meantime; what phono-preamp do you have? Is it the same if you power it off between switching between the speaker- and headphone outputs? Does the RCA-input behave this way with other analogue sources?
 

mARCELOCM

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Hello there!
I've recently purchased a Loxjie A30 and I'm experiencing some issues with it that I can't explain.
When I'm listening to a Vinyl record (with an LD PPA 2 preamp) on my Dali Spektor 2's, the sound is heavily distorted, especially the bass. However, when I switch to the Headphone out and listen to the same track on my headphones, the audio sounds great! When I play the same track via Bluetooth, the sound over the speakers is clean! So all combinations sound good (BT-Speaker, BT-Headphones, Phono-Headphones), except for one (Phono-Speakers). Has anyone experienced anything like this?
phono+speakers: You are using the LD PPA trough rca? the preamp must be grounded
phono+headphone: Are you using the preamp out or the loxjie headphone out?
from the bt combinantions, i assume you are not using the preamp, im right?
 

Gratefuldad

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Can anyone shed a light on the frequency division between main speakers and subwoofer out? If
If your subwoofer has say, a 60-80Hz filter built in, then a 500Hz rolloff in the subwoofer signal from the A30 (If that chart is actually right) isn't going to be a problem anyway. You're only going to see the end result of the much lower pass frequency that is built into the subwoofer. It is pretty unusual for a subwoofer not to have such a filter built in. Even my passive subs have them, and I have never used an active sub that didn't.
Does this mean the main speaker terminals are always receiving the full frequency bandwidth and there is no internal active crossover for the sub? (Just clarifying the convention).
 

Helicopter

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Can anyone shed a light on the frequency division between main speakers and subwoofer out? If

Does this mean the main speaker terminals are always receiving the full frequency bandwidth and there is no internal active crossover for the sub? (Just clarifying the convention).
Yes. There is no 500Hz cuttoff or other corresponding filter on the speaker terminals.
 

BuddyCasino

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Nov 25, 2022
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too bad there is no automatic or quick source selection :/
This is my biggest gripe with this amp. Does anyone know of a device with analog, digital & Bluetooth inputs that I could plug into this amp, so I don't have to switch sources? I currently use it for my TV and for Bluetooth music listening, and the source selection is annoying because otherwise I could entirely get rid of the remote.
 
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