Hidden functions 88 OEM stereo

[cc333]

It doesn't on the newer CDMs. Only the older (88-90, maybe 91) models.

That's too bad. I wanted to give these hidden features a try!

Anyway, while I'm here, does anyone know how to turn off the Dolby-B NR for the tape player? It sounds like it's on when I listen to music from my phone via an adapter, but there seems to be no way of disabling it (every other car tape player I've seen (which admittedly isn't many) has a button for this purpose). Perhaps there's some undocumented disablement method or something?

c

 

[DerekTheGreat]

Like others said, I can't get the DNR to stay lit, but LD will. I've got a CDM from a '94, head unit from an '89. Equalizer style set up. I've got aftermarket Infinity plate 4x6's, and I wasn't impressed with how "LD" made them sound- wasn't what I was expecting like with home gear.

 

[AK49BWL]

That's too bad. I wanted to give these hidden features a try!

Anyway, while I'm here, does anyone know how to turn off the Dolby-B NR for the tape player? It sounds like it's on when I listen to music from my phone via an adapter, but there seems to be no way of disabling it (every other car tape player I've seen (which admittedly isn't many) has a button for this purpose). Perhaps there's some undocumented disablement method or something?

c

Not if you have the three push-button style cassette deck. The 5-band EQ decks have a button to turn it off, but not those.

 

[cc333]

Not if you have the three push-button style cassette deck. The 5-band EQ decks have a button to turn it off, but not those

I do have the 5-band EQ deck, but I don't see any Dolby NR buttons anywhere, only CrO2, Prog, Eject, Fwd, Seek, Rev, and Rept, unless there's some special, undocumented combination of two or more of these buttons that, when pressed together, toggles NR? EDIT: I just checked, and I can thus confirm that there's no mention whatsoever of tape NR in the owner's manual, let alone a method for toggling it on/off.

Perhaps this is incentive to get that aux input going!

c

 

[AK49BWL]

The CrO2 button is the Dolby NR feature, it's just not called that for some reason. Same effect tho. If the button light is on, it's activated.

 

[cc333]

Really? Hmm... I guess it's just a lousy sounding deck, then.

I'll wire in the aux jack and see if that sounds any better.


c

 

[Triplel40]

The CrO2 button is the Dolby NR feature, it's just not called that for some reason. Same effect tho. If the button light is on, it's activated.

CrO2 (chromium oxide) changes the bias in the tape deck for Type II cassette tapes, which used more expensive chrome based tape vs the cheaper cassettes with iron based tape. Seems weird to me that it would work as a noise reduction because CrO2 tapes usually had better sound to noise ratios than normal ones.


Sent from my iPhone using Tapatalk

 

[AK49BWL]

Idk... Lol. I just know that when it's off, the tape output is marginally louder

 

[backinwhite90]

An update on this. I installed the 94 CDM unit with Bluetooth today. The 94 units have more output. I still have the 88 dash control unit. The hidden features still work, so it must have to do with the dash control.

How did you like the aftermarket cdm with bluetooth?