Stereo to mono at speaker outputs.

[Mayday0]

Hi. I am building a small stereo in a box to use at work. This is the amp I am using.
Ghxamp TPA3116 2.1 Subwoofer Bluetooth Amplifier Board 2X50W + 100W For Subwoofer Bluetooth 4.2 Speaker Car Home Theater-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group to Clipboard

The plan is that the amp will be mounted in one of the speaker boxes. And the second speaker will be remote. So what would be the best way to add a mono switch? So that if I want to just use the one box but still have all the sound and not lose a channel?
Thanks in advance

 

[rayma]

what would be the best way to add a mono switch? So that if I want to just use
the one box but still have all the sound and not lose a channel?

Wire a single switch between the L and R hot inputs, near the two RCA jacks.
The stereo source going to the RCA jacks should have a 1k resistor in series with each channel.

 

[Mayday0]

But there is also a Bluetooth input built in. Is there anyway I could do it at the left and right speaker outputs?

 

[rayma]

But there is also a Bluetooth input built in.
Is there anyway I could do it at the left and right speaker outputs?

You don't want to short those BTL outputs directly together.
If there was a pcb schematic, there may be a place to
short the two channels together with a switch, perhaps after
the relay that switches between RCA and Bluetooth.

It may be best to run in mono by switching the source that is
in use to mono, if possible.

 

[Mayday0]

I believe the RCA to Bluetooth switch is the volume knob. You just push it to switch. If that helps.

 

[rayma]

I believe the RCA to Bluetooth switch is the volume knob. You just push it to switch. If that helps.

That switch probably actuates the pcb relay (orange rectangle).

 

[Mayday0]

So basically find the pins for the output of the relay and short the left and Right?

 

[rayma]

So basically find the pins for the output of the relay and short the left and Right?

It is possible that may cause damage depending on the circuit, so we'd have to see the schematic
to know if it is safe to do, or not.

 

[Mayday0]

I asked the seller if he has one. I'll let you know when he gets back to me.

 

[Mayday0]

He finally got back to me and they don't have a schematic. So what's my best option?

 

[OffGridKindaGuy]

One of these?


Ceiling Speakers in the Home Audio / Video Department at Parts Express | 1934


With some switches or relays, you could use one speaker in a single cabinet. (8 ohm/channel)Then, in another cabinet, use another of one of the above speakers and parallel the inputs of both, which would give the impedance 0f 4 ohms. (A power boost also)


Just some food for thought..

 

[Mayday0]

How us that gonna help me switch from stereo to mono? I have speakers.

 

[OffGridKindaGuy]

How us that gonna help me switch from stereo to mono? I have speakers.

You may have speakers but are they dual voice coil? The units I suggest can have a stereo input and both channels of the amp are totally isolated. Hence, stereo information from one driver. That solves your problem. No damage to the amp and only 2 drivers. No need to alter the input to mono..

 

[Mayday0]

They are dual voice coil. So then I can short the speaker outputs?
With a switch.

 

[scottjoplin]

Could the outputs be mixed after 8 ohm power resistors? Never thought about it before, just throwing it out there.......

 

[OffGridKindaGuy]

They are dual voice coil. So then I can short the speaker outputs?
With a switch.

Please link to the speakers that you have.