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On February 24, 2022 Bose will be closing the Online Community Forum. We would like to thank all those who participated by sharing their experiences and love of Bose products. Online support for Portable PA products is still available by visiting Bose Support.

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wyattd
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Aug 16, 2018

Independent power for T4S

I have a T4S and the T1 Bose mains power supply.

I see the power supply is rated + 18v - 18v at 1A.  The mains connector is only 2 pin, (no adapter supplied for UK 3 pin which surprised me?)

I note that the specialised RJ45 plug appears to be wired for both the 18v positive and 18v negative supply voltages.

Does the T4S actually use both 18v positive and 18 negative at the same time or does it only use one pair based on how the 2 pin mains plug is connected? Clearly with only two pins this can plugged two ways into a mains adapter.

I had asked Bose what the power draw of the T4S was before purchase and was simply told 18v 2A, the markings on the Bose T1 power supply seems to indicate the actual power draw is less and no clarity on whether 18v positive or negative. 

Really need to get accurate specific data as I’m trying to build a completely portable rig running of a Portable AC power source.

Thanks for any help / clarity on the specific power requirement and voltage used by the T4S.

David

 

 

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ST - Pro
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May 11, 2020

Re: Independent power for T4S

Hi David,

The T4S is engineered to work with the ToneMatch Mixer Power Supply.

Use with any other power source (except an L1® Model 1S or L1® Model II) is not supported.

If you want to run completely portable, you'll want to connect the ToneMatch Mixer Power Supply to your power source.

Please note: A pure sine wave AC inverter is probably better than a modified sine wave AC inverter as the latter can introduce noise in the signal chain.

ST

wyattd
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Re: Independent power for T4S

This is what I have done. Of concern however was when plugging in the Bose power supply for the first time into the AC out of my SBase 360 portable power supply it is the first time I have had the fan in the portable power supply kick in.

This was concerning as it indicates the Bose power brick seems to be doing something that other AC power brick transformers are not doing and I have used a range of voltage and power drawing transformer bricks before on the portable AC power before, some drawing more amps than the Bose brick, without this happening. For me this need more testing to see if this was just chance or something unique about the Bose Power brick.

I wonder if it’s anything to do with the fact the T4S supply seems to be wired for both 18v positive and negative at the same time as a 1 amp rating on the brick is not that high.  Or it could be the brick or circuitry used in it is not compatible with the power source (An SBase 360 rechargable lithium battery backed inverter which itself is promoted as having a number of electrical safety features to prevents shorts, overloads etc). Clearly the Bose power brick is doing something different to other devices on the power draw front. For me this needs further testing to discover whether this is an issue with the Bose brick due to Non compatibility, faulty circuitry or the simultaneous 18v positive / negative output.

Consumers constantly hear horror stories about faulty electronic even from good brand name companies so from a safety view point it make senses after observing something different happening to discover why.

So does the T4S actually draws on both positive and negative voltages at the same time or could it be run on any reliable 18v 1a positive or negative source.

I understand the warranty issue, but in truth the Bose brick is unlikely to be any higher quality than any other power sources as they are all built to price points and voltage draw specifications. In electronics the only way a consumer can be certain of quality is to examine components actually used and the circuits.

David