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wyattd
Contributor
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Aug 16, 2018

Ground loop?

I have a Bose S1 Pro and Tonematch T4S.

I and powering the S1 Pro off it’s own internal battery and the T4S off a portable AC battery.

I have connected the T4S to the S1 Pro via its main out Right port. TS4 channels panned hard right.

1:   5 metre Vandamme / Neutrik TS instrument cable. 

Hum / buzz on S1 Pro at volumes above 2 indent on channel volume knob.

2:  Xvive bluetooth transmitter / receiver. This again is a TS connection.

Same as cable but with a slightly louder hum.

I note the online info recommends using a balanced TRS cable which I do not yet have.

a) Will this eradicate the hum?  

b) Are both left and right mains and Aux outs balanced connections?

My objective is to get my whole rig portable not requiring mains.

 

 

2 REPLIES 2
Ric1
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Apr 13, 2018

Re: Ground loop?

Tip ring sleeve cables are shielded to reduce interference.

ST - Pro
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May 11, 2020

Re: Ground loop?

Hello David,

Thank you for joining the Bose Portable PA Community. 

It's unlikely you have a ground loop when you are running the S1 Pro system on its internal battery.

With an unbalanced connection (Tip-Sleeve cable) between the T4S and the S1 Pro system, you may pick up more noise than you will with a balanced connection (Tip-Ring-Sleeve cable).

David Wyatt posted:

I have a Bose S1 Pro and Tonematch T4S.

Congratulations!



I and powering the S1 Pro off it’s own internal battery and the T4S off a portable AC battery.

Is the portable AC battery providing a pure sine-wave output? If not, the power source could be introducing noise in signal chain.



I have connected the T4S to the S1 Pro via its main out Right port. TS4 channels panned hard right.

1:   5 metre Vandamme / Neutrik TS instrument cable. 

Hum / buzz on S1 Pro at volumes above 2 indent on channel volume knob.

Do you mean the volume on the S1 Pro system is above the 12:00 o'clock detent? If so, try turning the S1 Pro system volume to around 10:00 o'clock and raising the T4S Master Volume.

2:  Xvive bluetooth transmitter / receiver. This again is a TS connection.

This product?
http://www.xviveaudio.com/productInfo.asp?id=298

I was chatting with someone last night who was using this for his guitar.

He said it was noisy.  He was using it for his heavily distorted electric guitar sound so I couldn't tell how much of what I heard was noise in the wireless system. But he said that it was unusable for clean guitar tones and acoustic guitar.  

Same as cable but with a slightly louder hum.

Have you tried the wireless system with another source and output device?

I note the online info recommends using a balanced TRS cable which I do not yet have.

a) Will this eradicate the hum?  

If the issue is not in the power inverter, then yes, a balanced connection should improve the signal to noise ratio.

b) Are both left and right mains and Aux outs balanced connections?

Yes

My objective is to get my whole rig portable not requiring mains.

You might find yourself among kindred spirits in this discussion.

S1 Pro system experiences running on battery power

Does that help?

ST