Hi!
I'm a complete beginner in the topic, I have a cheap 5.1 system with a broken amp (and it was equipped with a rather overly complicated preamp), and I thought I'd give a try to replacing the boards and give some update to the system, since I like the speakers.
My main concern on the preamp is that it should have a 2.1 functionality (where the sub plays the bass frequencies in mono) or an "extended stereo" functionality, by which I mean that left front & left surround play left, right front & right surround play right, sub plays low frequencies mono, center is either mono or silent. This would be a dream, but I'm completely fine with a 2.1 mode.
I've found some cheap Chinese boards (AIYIMA NE5532, AIYIMA NE5532 5.1 Tone Preamplifier Board HIFI 5.1 Preamp Volume Tone EQ Control Board DIY for 5.1 Amplifiers|Amplifier| - AliExpress) that look good, they have 5.1 and 2.0 inputs, but I don't know how do they behave with the 2.0 input. Can somebody that knows this kind of preamp tell me what happens if I connect a 2.0 input to the aux-l and aux-r? I see no switch to switch between the inputs, and my concern is whether this input would only be played in the stereo speakers, or the bass would go to the sub?
I also have a transformer leftover from the original amp, which has dual 11V, dual 12V, and normal 10V ac outputs. I've measured the 11V to be 12V+, is that enough for this preamp?
In case you know a preamp that meets my expectation and is in the price range, please also share.
Thank you!
I'm a complete beginner in the topic, I have a cheap 5.1 system with a broken amp (and it was equipped with a rather overly complicated preamp), and I thought I'd give a try to replacing the boards and give some update to the system, since I like the speakers.
My main concern on the preamp is that it should have a 2.1 functionality (where the sub plays the bass frequencies in mono) or an "extended stereo" functionality, by which I mean that left front & left surround play left, right front & right surround play right, sub plays low frequencies mono, center is either mono or silent. This would be a dream, but I'm completely fine with a 2.1 mode.
I've found some cheap Chinese boards (AIYIMA NE5532, AIYIMA NE5532 5.1 Tone Preamplifier Board HIFI 5.1 Preamp Volume Tone EQ Control Board DIY for 5.1 Amplifiers|Amplifier| - AliExpress) that look good, they have 5.1 and 2.0 inputs, but I don't know how do they behave with the 2.0 input. Can somebody that knows this kind of preamp tell me what happens if I connect a 2.0 input to the aux-l and aux-r? I see no switch to switch between the inputs, and my concern is whether this input would only be played in the stereo speakers, or the bass would go to the sub?
I also have a transformer leftover from the original amp, which has dual 11V, dual 12V, and normal 10V ac outputs. I've measured the 11V to be 12V+, is that enough for this preamp?
In case you know a preamp that meets my expectation and is in the price range, please also share.
Thank you!
12 V ac will be ok
This is my opinion, without the schematic, hard to say, as the "manual" from the seller is not completely clear.
Not familiar with the unit, but it seems that it will do 2.1
with a with the tunable filter
I don't quite understand the purpose of your extended stereo, but all it may need is to feed the left into the left and left surround inputs on the amp.
You said:
My main concern on the preamp is that it should have a 2.1 functionality (where the sub plays the bass frequencies in mono) or an "extended stereo" functionality, by which I mean that left front & left surround play left, right front & right surround play right, sub plays low frequencies mono, center is either mono or silent. This would be a dream, but I'm completely fine with a 2.1 mode.
This is my opinion, without the schematic, hard to say, as the "manual" from the seller is not completely clear.
Not familiar with the unit, but it seems that it will do 2.1
with a with the tunable filter
I don't quite understand the purpose of your extended stereo, but all it may need is to feed the left into the left and left surround inputs on the amp.
You said:
My main concern on the preamp is that it should have a 2.1 functionality (where the sub plays the bass frequencies in mono) or an "extended stereo" functionality, by which I mean that left front & left surround play left, right front & right surround play right, sub plays low frequencies mono, center is either mono or silent. This would be a dream, but I'm completely fine with a 2.1 mode.