Streaming to a Bluetooth speaker or headphones from a phone, mobile device or Bluetooth-enabled TV can be super convenient. But some of us have a cornucopia of legacy audio gear that we’d like to stream from as well. No one wants to toss a beloved turntable, stereo receiver, CD player, AM/FM radio, or the like just because it was manufactured before the age of Bluetooth.

Enter Avantree with its TS418 Bluetooth dual-transmitter. The TC418 not only offers both analog and light-pipe digital inputs, it will also stream audio from just about any device (computer, phone, etc.) that supports USB audio.

Video gear is another story because of latency issues. More on that later.

Features and specs

The TS418 is a Bluetooth 4.2, dual-transmitter device featuring the low-latency version of Qualcomm’s aptX audio transmission codec. Regular aptX, FastStream, and SBC are also supported (aptX HD, however, is not supported). “Dual” means it can stream to two pairs of Bluetooth headsets or speakers simultaneously. That can be handy under a number of circumstances, including two-room setups.

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As I said up top, what sets the TC418 apart from many transmitters is the variety of supported connection types. It’s powered via its micro-USB port and functions as a USB audio interface, handily allowing you to transmit sound from your computer and anything else that supports standard US-class audio. The legacy support kicks in with a 3.5mm stereo input that accepts both line-level and microphone-level input, as well as a S/PDIF optical port. This means you can use the output from just about any piece of stereo equipment, no matter the vintage.

Avantree thoughtfully includes all the cables you might need: a 3.5-mm-to-3.5mm male-to-male stereo cable, a stereo RCA-to-3.5mm female cable that converts the first able, as well as an optical S/PDIF light pipe. There’s also a micro-USB to Type A USB cable for the computer connection and power.

There’s no LED readout on the TC418, but there is a connection indicator light for each of the two channels, and pairing the unit is super easy. Simply press the A (channel one) or B (channel two) button, and then the pair button on the Bluetooth receiver you want to use. The process took about five seconds each time with all five of the speakers and headphones I tested the TC418 with.


I live in a tough environment for wireless, the chicken-wire-over-lath that forms the base for drywall and plaster does a good impression of a Faraday cage. The TS418 is rated a Class 1 transmitter, which means you should be able to stream up to around 30 meters under ideal conditions (i.e., line of sight). I didn’t fare that well; 30 feet was more like it in my apartment, and it reached around 60 feet in the IDG offices.

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