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Mono Audio Output Jack -- Records on Only One Side of a Stereo Recording
on March 10, 2016
This adapter works very well in making a clean, hum-free, recording. This is because the circuitry uses a small transformer to isolate the sound signal. Cheaper adapters (i.e. $10 or less) do not use a transformer to reduce interference and hum. An adapter like this one is especially needed if you are going to connect it between your telephone and a headset amplifier. Having said all that, this unit has one big flaw in my opinion. It uses a mono jack for the audio out which is a problem if you are recording to a recorder or sound card that has a stereo audio recording input. Most recorders and sound cards have a stereo audio input. This means that if you record the phone conversation to a stereo recorder or sound card, the sound will only record on one channel and the other channel will have a very low volume of cross-talk or noise. Now it is true that the sound from the phone is monotone (one channel) but when you record, you want this monotone audio to be recorded on both the left and right channels for playback on all audio speakers, not just Left or Right, and to eliminate any noise on the channel where the audio has not been recorded. And it is true that you could adjust the settings on your recorder or PC to just record in mono, but for most this would be inconvenient and you might forget to do so before making a recording. Better phone recording adapters are designed to record on both Left and Right channels (see Mike Sandman Enterprises, Inc. Deluxe Handset Recording Adapter). Again, if your recording device is strictly mono (1 channel) audio input, your fine, but most are not. I strongly recommend that VEC redesign this unit with a stereo audio plug and have the sound output to both Left and Right channels.