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Thread: Tascam 38 Bass Artifacts

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    Tascam 38 Bass Artifacts

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    I was just adding a bass track to a song on track 3 of my 38.

    I used some very light compression and went direct from my M2600 board to the 38. Recording levels were good, extending occasionally into +1 or +2 VU. Using RMGI SM911 tape. While monitoring from the sync head during recording, everything was crystal clear.

    Upon playback however, I noticed that while still clear and punchy, there were some strange artifacts on almost every note played, almost like a speaker rumbling or small tear in a speaker. Impossible of course since I went direct and the monitor sound was perfect. Its a small annoyance and can't really be heard when sitting in the mix.

    Still, I re-recorded the track on track 4 and again on track 6. Same thing. What is odd is that all the other tracks like guitar and acoustic guitar sound great, just this bass track has the artifacts.

    I don't recall anything being off on any low frequency tests when I calibrated the machine a couple months ago, so I'm not sure it's a calibration issue.

    It's not a major issue but was wondering if anyone has run across this or has other suggestions of things to try differently?

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    As a first guess, I'd say 'Bias'. Do you have an example clip?

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    Quote Originally Posted by jpmorris View Post
    As a first guess, I'd say 'Bias'. Do you have an example clip?
    I can try to get a digital clip this weekend. It almost sounds like a small paper rattle.

    Are you talking about erase bias or tape/record bias? I did the procedures for this SM911 tape/record bias. All frequencies showed within +/- 3db as per the manual. I can run it again though.

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    Without hearing it, it's hard to say, but insufficient record bias does produce weird sounds at certain frequency ranges. IIRC bass it makes something of a 'gravelly sound', like rocks sliding around. With high frequencies I got hiss.

    Have you tried recording test tones at 100, 1000 and 10000 Hz on a blank section and listening for anything weird?

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    Did you record the bass with dbx noise reduction?
    Don't let schooling interfere with your education - Mark Twain

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    Quote Originally Posted by lo.fi.love View Post
    Did you record the bass with dbx noise reduction?
    No, I do not have noise reduction.

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    Attached is an mp3 version of the artifacts. Hopefully the artifacts can be heard in this 256k mp3 file.
    Attached Files Attached Files

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    Quote Originally Posted by jpmorris View Post
    Have you tried recording test tones at 100, 1000 and 10000 Hz on a blank section and listening for anything weird?
    Just recorded the tones. The low frequencies 60hz, 100Hz, sound noisy as well. I readjusted bias, rec frequency, everything is on. Still a slight distortion on those very low freqs.

    Higher frequencies sound great.

    Could it be erase bias?

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    I'm honestly not sure what to make of that. For the most part erase just seems to be a current adjustment - what I did for my A807 was simply to record a sinewave for 10 minutes or so, then erase it, listening to the playback with the volume cranked up and adjusting the trimmer until the residuals went away. Kind of ham-fisted, I will admit.

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    Hey FSTRAT, did you ever figure out what was happening with those artifacts? I have a tascam 48 and have the exact same situation. Any ideas would be great!!

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