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How to Bypass DBX Noise Reduction on a Tascam 244
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- čas přidán 29. 07. 2021
- Sometimes a Tascam 244 owner may wish to bypass DBX noise reduction on one or more of the channels.
Here are three reasons you might want to do this;-
1 Troubleshooting purposes: Does a fault persist after the DBX board has been bypassed? If so, the fault must lie on the DBX printed circuit board. If not, the fault does not lie with the DBX board.
2 To better facilitate synchronisation with external gear , be that SMPTE, FSK / MIDI, or signals for synchronisation recorded from Korg Volcas, TeenageEengineering Pocket Operators and the like: Being a system of companding, DBX will change the shape of synchronisation waveforms, making it harder for external equipment to read, so it is usually desirable to disable noise reduction on the tape track carrying the synchronisation signal.
3 It sounds objectively different and for some people subjectively better to disable DBX: Though i personally like the wider dynamic range and bias towards the lows and low mids I get when I record using this noise reduction scheme, it subdues the high end and it is harder to push the tape into saturation without getting compander artefacts , so for some tastes or styles of recording, a hot signal to tape without noise reduction is a better approach.
The bypass is achieved by using dupont bread-boarding cables (you can get a packet of a coup of dozen for a couple fo dollars from amazon, ebay, etc etc) to bypass the DBX PCB altogether. Essentially you remove all four of the plugs form the DBX board, and connect the 32 sockets using 16 breadboard cables, with pin 1 joining to pin 3, pin 2 joining to pin 4 and so on.
As I mention towards the end of this video, it is possible to insert switches between the cables and the DBX board and mount those switches on the side of the plastic case, allowing for convenient bypass of the DBX system without opening the unit. I have occasionally received Tascam 244s with this modification, and will probably demonstrate it at some point.
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Many Thanks!
Amazing, thank you
Lots of folks are gonna want this one 🔥. Any chance we’ll get a PortaTwo tear-down anytime soon?
Hey, Im editing those tear downs today, they should go up the second week of August
Excellent
Thanks for your clear portastudio tutorials. I have a Tascam 246 and wonder if the DBX is creating buzz from the signal. When I'm not putting an instrument through the mike there is clean silence, but it arrives as soon as anything gets recorded on the mike. Any ideas?
Yeah that’s possible…short of recapping the DBX I’m not sure how to remedy it though? DBX compander times are adjustable via a trimpot, but it’s a dark art - maybe experimenting with that’d work?
You inspired me to buy 244 and clean it myself. Also bought 2nd 244 for spares for like $50 and turned out to be good decision cause I took DBX and one mixer channel from that one.
BUT I decided to turned DBX off and your video helped me on that also! Thank you for that. Really appriciated. I love tape saturation.
However i noticed big volume drop. When I record it is the same as before - can get pretty loud fast and that is what I aim for - distortion and saturation. But when playback from tape it is unlikely to get VU meteres even moving (usually stays at -20dB). Is that normal?
I definitely noticed a volume drop when I've experimented with this, but not that much. Sounds like your playback amps were quiet to begin with? Try recalibrating those?
Hi tetrakan! do you know if it's possible to bypass the dolby b on a teac 144?
I've never done it but I think it'd be possible. It would involve modifying the PCB - cutting tracks and lifting the foil with a craft knife, soldering in new jumper wires, possibly mounting new switches on the lower plastic case. Old recordings might still sound weird since I think that version of dolby is encoded during recording, not just applied on playback.
@@Tetrakan sounds complicated for my skills, but I'll try to figure it out. thank you for the reply and for all your videos
hi sir . I have followed the method and it works . but the channels level went down . even the VU meters shows low signal . did you face same issue ?
No, my levels did not drop much...how much resistance are your connectors introducing? I wonder if the extra resistance is attenuating the signal?
@@Tetrakan i have captured a video of the situation. you can see that the sound is low and the VU meter even not moving . I recorded the sound and opened it in audacity. very very low
czcams.com/users/shorts-kakMA-H_u4?feature=share