I am trying to add an old yamaha powered sub (like a YSTFSW050BL but much older and has no crossover as it relies on the amp) to my simple AV system (I have a TV where all inputs go to and I use the ARC channel to a Samsung sound bar). My Sound bar doesn't have a sub output so I have taken the optical out from the TV and pushed it though a small gizmo to turn this into a Left and Right analogue signal, one of which I tried plugging into the back of the sub. It works but it sounds awful, which I assume is because it's getting frequency range that it shouldn't be.
So I tried ordering one of these (NE5532 Low Pass Filter Board Subwoofer Volume Control Board Amplifier Module 9-15V Module Board from Electronic Components & Supplies on banggood.com) but I get nothing out of the module. So either the module is a dud, or I am barking up the wrong tree and I need to find a different solution.
Any ideas if this should work? Or should I look at something like a speaker crossover? (will this work with line level signals?)
Thanks.
So I tried ordering one of these (NE5532 Low Pass Filter Board Subwoofer Volume Control Board Amplifier Module 9-15V Module Board from Electronic Components & Supplies on banggood.com) but I get nothing out of the module. So either the module is a dud, or I am barking up the wrong tree and I need to find a different solution.
Any ideas if this should work? Or should I look at something like a speaker crossover? (will this work with line level signals?)
Thanks.
One thing I CAN tell you to beware of optical to analog converters that are stereo only. When presented with
5.1 they will make some really bad screeching. The 5.1 converter will do proper stereo if presented with
stereo only. To get the sub you either need to mono mix the L and R but in 5.1 those might be limited to
80 Hz. In 5.1 mode the sub gets its own feed independent of L and R. A stereo only feed will be full
bandwidth L and R so you need to mono mix and filter at 80 Hz.
I did what you want and more in this.
5.1 channel preamp
G²
5.1 they will make some really bad screeching. The 5.1 converter will do proper stereo if presented with
stereo only. To get the sub you either need to mono mix the L and R but in 5.1 those might be limited to
80 Hz. In 5.1 mode the sub gets its own feed independent of L and R. A stereo only feed will be full
bandwidth L and R so you need to mono mix and filter at 80 Hz.
I did what you want and more in this.
5.1 channel preamp
G²
Interesting project, but a little beyond me.
The gizmo is stereo, but no screeching. I need to delve deeper.
The real reason I am trying to use the old sub was to prove that the "concept" of taking the optical though the gizmo to the sub would work and then I was going to invest in a newer powered sub with stereo inputs and frequency adjustment built in.
The gizmo is stereo, but no screeching. I need to delve deeper.
The real reason I am trying to use the old sub was to prove that the "concept" of taking the optical though the gizmo to the sub would work and then I was going to invest in a newer powered sub with stereo inputs and frequency adjustment built in.
Ah... "Power Supply: AC double 9 -15V"
I am giving it 12v DC 🙁
(Strange it lights up a blue LED on the board)
I am giving it 12v DC 🙁
(Strange it lights up a blue LED on the board)
Yeah that makes a difference. 😉 Now all you'll have to do is find the proper transformer for your application.
I can't find any suitable power supply off the shelf, and not sure my electronics skills extend far enough to build one.
Will a passive crossover like usually find inside a speaker work with a line level signal (I could probably build one of these) or do they need an amplified signal?
Will a passive crossover like usually find inside a speaker work with a line level signal (I could probably build one of these) or do they need an amplified signal?
looks like you need 9-0-9VAC or 12-0-12VAC transformer like this but it means working with mains voltages.
M4912C - Powertran 240/12+12 30VA Toroidal Transformer - Altronics
If you have issues with electronic skills then it's best to put a speaker level passive xo inside the sub after the power amplifier. It will not work at line level.
M4912C - Powertran 240/12+12 30VA Toroidal Transformer - Altronics
If you have issues with electronic skills then it's best to put a speaker level passive xo inside the sub after the power amplifier. It will not work at line level.
The issue with the transformer is its a $50 power supply for a $5 board to try and get a $120 sub working 🙂
I will have to find another solution. The sub is a yamaha YSTFSW050BL so I can't change it's internals.
I have been looking at this site - TLS.org | Passive Line-Level Crossover
Will try and knock up this on a breadboard this evening and see if it works.
I will have to find another solution. The sub is a yamaha YSTFSW050BL so I can't change it's internals.
I have been looking at this site - TLS.org | Passive Line-Level Crossover
Will try and knock up this on a breadboard this evening and see if it works.