VEC TRX-20 3.5MM Direct Connect Telephone Record Device (ADAPTER ONLY)

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9.3Expert Score
Overall BVR Rating
Total Reviews:562
VEC TRX-20 3.5MM Direct Connect Telephone Record Device (ADAPTER ONLY)
PROS
  • 21 REVIEWS VOICE RECORDER
  • 17 REVIEWS EASY TO INSTALL
  • 10 REVIEWS DIGITAL VOICE
  • 35 REVIEWS WORKS GREAT
  • 4 REVIEWS SOUND CARD
  • 31 REVIEWS EASY TO USE
  • 8 REVIEWS DIAL TONE
  • 15 REVIEWS WORKS FINE
  • 17 REVIEWS PHONE CALLS
  • 5 REVIEWS DIRECT CONNECT
  • 10 REVIEWS DIGITAL VOICE RECORDER
  • 50 REVIEWS RECORD PHONE
  • 12 REVIEWS CONNECT TELEPHONE
  • 3 REVIEWS DIAL THE NUMBER
  • 3 REVIEWS OLYMPUS DS-
  • 7 REVIEWS SIDES OF THE CONVERSATION
  • 4 REVIEWS TRX- DIRECT
  • 3 REVIEWS TRIAL AND ERROR
  • 3 REVIEWS STOPPED WORKING
  • 6 REVIEWS SOUND QUALITY

Please check if your phone system is compatible-with this adapter some phones are not compatible recording device is needed for this adapter to work recorder & phone not included

Top Positive Review

So far, great sound quality or has a seemingly high signal to noise ratio. Also, very easy to install and versatile.

Two misconceptions, this VEC TRX-20 device does include the spiral cord and the 3.5mm or 1/8 mini jack. The device also connects to the headset rather than at the telephone jack. (Far better on the handset, for maintaining audio quality.)

My setup, I plug the output or the 3.5 or 1/8 mini-jack of the VEC TRX-20 into a pre-amplifier, then from the pre-amp into the line-in of an Asus Xonar Essence STX PCI/PCIe computer card. (The ASUS STX cards are one of the best sounding or highest signal to noise ratio sound cards on the market.)

Trying to connect this device directly to a computer sound card without using a pre-amplifier may require enabling “mic boost” through the computer operating soundcard frontend settings, and greatly degrading the sound quality or signal to noise ratio depending on the quality of sound card used. I would strongly suggest using a (microphone) preamplifier, costing another $50-100 and can be readily bought through most music stores. The better pre-amplifiers tend to use XLR micrphone connectors, include +20dB mic boost for which I find essential, as well as 1/4 inch jacks rather than the small 1/8 jacks.

My equipment:
1) This device, VEC TRX-20
2) Studio V3 Tube MP Pre-amplifier (Settings: w/o +48v turned on, and +20dB Gain and Phase Reverse enabled)
3) Asus Xonar Essence STX PCI/PCIe sound card
4) Software: Linux ALSA arecord, aplay and alsamixer for recording 32 bit 48000hz PCM WAV files. (Photo shows only 16 bit rather than 32 bit recording due to an error on my part!)

4 People Found This Helpful

Top Critical Review

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.
42 People Found This Helpful

Customer Questions & Answers

Does not record
Answer: I’m not sure if this is a question or a statement. This item does not, in fact, record. It must be plugged into the mic port of a recording device. Hope this helped.

I have a Olympus VN-702PC Voice Recorder and a land line phone. Is this the only other piece of equipment I will need to record calls?
Answer: Hello, Yes, I suggest you ensure you have a voice recorder with noice canceling capability. I used a recorder without that feature and the quality of recording was very difficult. I highly recommend this little device. Good Luck!

I use this device from the phone line to the sound card’s line in on the media server. Will it still work if our phone is changed to digital?
Answer: I think so, but you may have to open the side panel and, using the key on the bottom of the device, try various settings to get the voice and audio right. Sometimes this may make the phone button tones sound funny, but they still work.

Can I hook up two digital recorders to this at the same time?
Answer: Hello, we have not tested it but you can probably connect two recorders on the same adapter using a 3.5 mm mono splitter. Call us with any questions to (800) 644-9525, ext. 124.

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Expert Score 9.3
PROS:
  • 21 REVIEWS VOICE RECORDER
  • 17 REVIEWS EASY TO INSTALL
  • 10 REVIEWS DIGITAL VOICE
  • 35 REVIEWS WORKS GREAT
  • 4 REVIEWS SOUND CARD
  • 31 REVIEWS EASY TO USE
  • 8 REVIEWS DIAL TONE
  • 15 REVIEWS WORKS FINE
  • 17 REVIEWS PHONE CALLS
  • 5 REVIEWS DIRECT CONNECT
  • 10 REVIEWS DIGITAL VOICE RECORDER
  • 50 REVIEWS RECORD PHONE
  • 12 REVIEWS CONNECT TELEPHONE
  • 3 REVIEWS DIAL THE NUMBER
  • 3 REVIEWS OLYMPUS DS-
  • 7 REVIEWS SIDES OF THE CONVERSATION
  • 4 REVIEWS TRX- DIRECT
  • 3 REVIEWS TRIAL AND ERROR
  • 3 REVIEWS STOPPED WORKING
  • 6 REVIEWS SOUND QUALITY
VEC TRX-20 3.5MM Direct Connect Telephone Record Device (ADAPTER ONLY)
VEC TRX-20 3.5MM Direct Connect Telephone Record Device (ADAPTER ONLY)
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