I need help identifying this box

[ThomasTedder]

I found this box screwed to the top of the glove box liner. What is it?

[MaximRecoil]

That's funny. I have the same box in the same location in my '69 and I've wondered what it is. I was planning to make a thread asking about it, as soon as I got around to taking a picture of it.

[A383Wing]

Prototype Flux capacitor igniter?

[Charger-Bodie]

Its part of the dual speaker 8track system.

[MaximRecoil]

Its part of the dual speaker 8track system.

Interesting. I had no idea my car came with an 8-track player (just a gaping hole where the radio used to be when I got the car). It does have a 3-speaker dash.

What does that box do exactly?

[ThomasTedder]

Its part of the dual speaker 8track system.

My charger came with 3 speakers in the dash. I guess it had an 8 track too, but that's long gone.

[Brock Lee]

What does that box do exactly?

Looking at the schematics, it appears it may be the amplifier section. It is possible they couldn't fit the amp in the radio with all the tape player components, so they made it external.

[Nacho-RT74]

Crossover system for the speakers. very tipical on E bodies... this is the harness:

http://www.ebay.com/itm/Mopar-Cuda-Challenger-3-speaker-Crossover-Radio-Harness-/151114524816?pt=Vintage_Car_Truck_Parts_Accessories&hash=item232f20a890&vxp=mtr#ht_68wt_1170

[MaximRecoil]

Crossover system for the speakers. very tipical on E bodies... this is the harness:

http://www.ebay.com/itm/Mopar-Cuda-Challenger-3-speaker-Crossover-Radio-Harness-/151114524816?pt=Vintage_Car_Truck_Parts_Accessories&hash=item232f20a890&vxp=mtr#ht_68wt_1170

What would a crossover be doing in a factory stereo system consisting of only full-range speakers?

Crossovers are used to split up the frequencies / direct them to specific speakers in component speaker systems. For example, if you had a typical aftermarket system consisting of a subwoofer, a pair of midrange drivers, and a pair of tweeters; and two amplifiers: a mono class D amplifier for the subwoofer and a stereo class A/B amplifier for the midrange drivers and tweeters, you would:

- Set the built-in active low-pass crossover on the mono amplifier to e.g. 80 Hz, which allows frequencies of 80 Hz and lower to pass to the subwoofer, while frequencies higher than 80 Hz are rolled off at e.g., 6, 12, 18, or 24 dB per octave, depending on the design of the crossover.

- Set the built-in active high-pass crossover on the stereo amplifier to 80 Hz, which allows frequencies of 80 Hz and higher to pass to the midrange drivers and tweeters, while frequencies lower than 80 Hz are rolled off at e.g., 6, 12, 18, or 24 dB per octave, depending on the design of the crossover.

- Use a passive combination highpass/lowpass crossover between the midrange drivers and tweeters. Unlike active crossovers, these are usually preset to a specific frequency, such as 3 kHz for use with midrange driver / tweeter combinations, which allows frequencies of 3 kHz and higher to pass to the tweeters, and frequencies of 3 kHz and lower to pass to the midrange drivers, while frequencies lower than 3 kHz to the tweeters and frequencies higher than 3 kHz to the midrange drivers are rolled off at e.g., 6, 12, 18, or 24 dB per octave, depending on the design of the crossover.

So in a system that only has full-range speakers, like nearly all factory systems including all of them available in an old Dodge Charger, what function does a crossover serve?

[Nacho-RT74]

I know what a crossover is ( I'm an audio tech ) but is the way how was called

[Troy]

The only way you could get a 3 speaker dash was with the 8 track. It was the only stereo option (AM and FM were still mono in those days).

Troy

[MaximRecoil]

I know what a crossover is ( I'm an audio tech ) but is the way how was called

Yes, I'm just wondering what this thing that Chrysler called a "crossover" actually does.

[maxwellwedge]

I think it is more of a fader. Every 8 Track car I have has one. Shows in the FSM wiring diagrams as well. If you need one they aren't cheap.

[John_Kunkel]

From the '68 parts manual:

Plate and Cover, Cross Over Mtg, Stereo 2820 885. B, C and Y-Body.