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Boombox with dbx?


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#1 caution

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Posted 11 January 2018 - 08:33 PM

Some of you are may be familiar with dbx. It's similar to Dolby in that it reduces hiss, nearly eliminates it actually, but moreso it's a compressing/expanding (companding) process that greatly expands dynamic range. There are some drawbacks such as "breathing" during quiet passages and finicky about recording levels. I used to record CDs back in the day with dbx on my old Aiwa deck, but unlike Dolby its unlistenable on a non-dbx system.

 

I did some searching a couple years ago and actually found one boombox with dbx, but cannot remember how I found it or what model it was. I know that it was black, a later model probably made in or after 1986 by one of the big names, and was either a 3-piece or looked like one.

 

It's exceedingly rare among portables. I only know of three models. Two are Walkmans - the Panasonic RQ-J20X and the Teac PC-7RX. The Marantz PMD-430 also has it.



#2 hopey

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Posted 12 January 2018 - 04:27 AM

How good is dbx. I don't know if it being on a portable. It's a case of production cost and volumes. Dolby c is just two b stacked as the chips where made in large volumes this would have made it cheap to make verses the new dbx.

#3 Transistorized

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Posted 12 January 2018 - 01:11 PM

I have never had an opportunity to try out dbx. I have heard that dbx usually only sounds good played back on the original deck that recorded it and that azimuth alignment could throw off the sound from one dbx machine to another. 

 

Not sure if any of this is true. Would love to hear a finely tuned dbx machine one day 



#4 Lasonic TRC-920

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Posted 12 January 2018 - 03:40 PM

Is DBX like Dolby C? In the fact that recorded Dolby C tracks can't be played on anything but C decks?



#5 Transistorized

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Posted 12 January 2018 - 03:50 PM

Is DBX like Dolby C? In the fact that recorded Dolby C tracks can't be played on anything but C decks?

That is correct. Once Recorded using dbx it needs to be played back in a machine with a dbx decoder either built in or added to to the deck



#6 hopey

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Posted 12 January 2018 - 09:56 PM

Dolby c is only mild and can be played on any deck. That's the reason it won out.

#7 Lasonic TRC-920

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Posted 13 January 2018 - 03:04 AM

 

Is DBX like Dolby C? In the fact that recorded Dolby C tracks can't be played on anything but C decks?

That is correct. Once Recorded using dbx it needs to be played back in a machine with a dbx decoder either built in or added to to the deck

 

 

Yeah, I can see the limitations with that. Of course, back in the day, you might only go from your cassette deck at home (home stereo or boombox) to the car stereo, so that really wasn't that big of a deal.

 

Dolby c is only mild and can be played on any deck. That's the reason it won out.

 

I thought I remembered something like that. Thanks



#8 Ghettoboom767

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Posted 16 January 2018 - 05:22 PM

My Alpine 7347 has it! Like said here you have to have a DBX encoder to record in real DBX for mat and a player that has DBX to play it back on correctly.
Yes let me know what Boombox has it as I’d like to have one with DBX.