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Pace underdash 8 track player instalation instructions
I would like to install my Pace Underdash 8 track player in my 1989
Buick Lesabre. Can this be done with a harness and a splitter of some kind so I can use the delco am/fm cassette indash unit as well as the 8 track. Would I need seperate speakers? Can this be done? I would be grateful if someone could help me out. Thanks Rusty |
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#2
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Pace underdash 8 track player instalation instructions
On 29 May 2007 22:34:54 -0700, Rusty wrote:
I would like to install my Pace Underdash 8 track player in my 1989 Buick Lesabre. Can this be done with a harness and a splitter of some kind so I can use the delco am/fm cassette indash unit as well as the 8 track. Would I need seperate speakers? Can this be done? I would be grateful if someone could help me out.snip It has its own (not-so-good) audio amps, so you cannot simply feed one into the other. There ARE ways to use the first voltage stage of the amplifiers to provide a line level output to go into an aux input of another unit, but the stock Delco has no facility for that at all. I did this with a combo CD/cassette/radio unit that had an audio input for a CD changer, which is line level out, and it worked fabulously until I got rid of the 8 track in that car. Reason: I dubbed all my still-wanted 8 tracks onto CD-Rs, so why bother with a troublesome, clunky 8 track that was always in the way? You either use separate speakers, or you MAY be able to use an underdash EQ/amplifier and route both the stock radio and the 8 track into it. For good quality, though, you'll need to bypass the output transistors in both units, which are a major source of distortion whether they're driving speakers OR just providing voltage into a resistive load. Overall, the best feasibility for someone with no electronic skills is to simply put in two more speakers (somewhere) and run the 8 track all by itself. |
#3
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Pace underdash 8 track player instalation instructions
Rusty wrote:
I would like to install my Pace Underdash 8 track player in my 1989 Buick Lesabre. Can this be done with a harness and a splitter of some kind so I can use the delco am/fm cassette indash unit as well as the 8 track. Like Bob said, the simplest thing to do (electrically) is to just install two more speakers that are wired directly to the 8-track deck. Mechanically it might be interesting to find a place to mount the speakers, but you can probably do it. If you don't want to install more speakers, a simple thing to do, albeit probably with reduced sound quality, is to wire the outputs of the 8- track deck to one of those "CD to cassette" adapters, or an FM modulator as used with MP3 players. This would route the 8-track output to a "cassette" that could be plugged into the Delco, or onto an FM frequency that could be received on the Delco. This lets you use all four of the stock speakers without much fancy wiring. If you don't want to use the CD-cassette adapter or the FM modulator, the next possibility is to install a couple of toggle switches so you can select whether the front speakers are connected to the stock Delco tuner or the 8-track. You used to be able to get a single switch that would do this, but these days it's probably easier to use two switches. In a nutshell, you'd need two DPDT switches. You'd take the Delco radio out of the dash and identify the two wires in the harness that go to the left front speaker. You'd cut those two wires and splice more wire onto the four ends you have, and route the four longer wires to where you want to mount the toggle switches. The wires coming from the speaker (harness side) would go to the wiper of one of the toggle switches. The wires coming from the Delco radio (connector side) would go to one end of that toggle switch. You would then run the left speaker wires from the 8-track deck to the other end of that toggle switch. You would then repeat the cut, splice, connect-to-switch for the right channel. To operate, you'd start with the Delco and the 8-track both shut off. To listen to the Delco, make sure both switches are flipped the right way, and then turn on the Delco and listen to the radio or a cassette. To switch to 8-track, turn off the Delco, flip both switches the other way, then turn on the 8-track deck. To switch back to the Delco, shut off the 8-track deck, flip both the switches, then turn the Delco back on. The goal is to avoid having either the Delco or the 8-track turned on and playing without any speakers connected. Both units _probably_ don't mind playing with no speakers connected, but there is a small chance that one or both of them might be damaged. If you didn't like the look of the two toggle switches, you could do the same thing with four standard automotive relays and a single push-on push-off switch. The wiring would look a mess, but the finished product might look a little cleaner. The main thing is that you have to have something else in the equation besides the Delco, the 8-track, the speakers, and pieces of wire. If you try to hook the Delco and the 8-track to the same speakers without anything else in between, you _will_ damage the Delco or the 8-track or both. If none of the above stuff makes very much sense, then consider installing more speakers for the 8-track. Matt Roberds |
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Pace underdash 8 track player instalation instructions
On May 30, 1:34 am, Rusty wrote:
I would like to install my Pace Underdash 8 track player in my 1989 Buick Lesabre. Can this be done with a harness and a splitter of some kind so I can use the delco am/fm cassette indash unit as well as the 8 track. Would I need seperate speakers? Can this be done? I would be grateful if someone could help me out. Thanks Rusty you can wire it to the same speakers, just make sure the delco it off while playing the 8-track and whatever you do, don't listen to DeserTBob- his tech tips ruined Ommadawn's tape deck |
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Pace underdash 8 track player instalation instructions
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Pace underdash 8 track player instalation instructions
On 30 May 2007 03:17:55 -0700, duty-honor-country
wrote: you can wire it to the same speakers, just make sure the delco it off while playing the 8-track snip DO NOT DO THIS! Of course, you know Charlie Nudo to be a fake, a liar and a thief. NEVER parallel amplifier outputs unless you really know what you're doing...PERIOD. |
#7
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Pace underdash 8 track player instalation instructions
I will use a Pioneer tsx-150 surface mount speaker. the only problem
now is the power source. Were the underdash 8 track players powered through a harness or were they spliced in? |
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Pace underdash 8 track player instalation instructions
On 30 May 2007 16:53:48 -0700, Rusty wrote:
I will use a Pioneer tsx-150 surface mount speaker. the only problem now is the power source. Were the underdash 8 track players powered through a harness or were they spliced in? snip Just used a fused tap from the aux body feed bus on the fuse block using the fuse that comes with the unit. |
#9
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Pace underdash 8 track player instalation instructions
DeserTBoB wrote:
On Wed, 30 May 2007 07:48:18 GMT, wrote: If you don't want to install more speakers, a simple thing to do, albeit probably with reduced sound quality, is to wire the outputs of the 8- track deck to one of those "CD to cassette" adapters, or an FM modulator as used with MP3 players. The FM modulator seems the best route in this case, and is an excellent idea for this. I saw where Rusty is just going to use a separate speaker, but per the concerns about running an amp in the 8-track deck with no load, maybe it would be good to put a resistor across each speaker output as well as the jack for the modulator. Probably something higher-value than the impedance it was designed for - if it was designed for 8 ohms, use maybe 16 - just so you don't load it that much and can get away with a lower-powered resistor. The modulator may have a couple of 32 ohm or so resistors across its input to load the headphone output it's designed to be plugged into, but I've never taken one apart to see. Years ago, I did this same thing with a ganged switch that would select a "one or other" output to the speakers, and would simultaneously put an 8 ohm load on the unit not selected, which would keep the output happy. Probably as late as 10 years ago, you could walk into Radio Shack and buy a ready-made part that would do this. You can't anymore because the demand just isn't there; if you want to deliver square waves from about 10 Hz to 200 Hz into a huge speaker, you can get the parts for that, though. This was, of course, an absolute must in the tube days, since running a tube radio or amplifier unterminated would surely arc out the output transformer in record time due to the very high voltages that would develop in the transformer primary with the secondary unterminated. I'm pretty sure I understand the actual mechanisms involved, and I know that the best thing for any amplifier is to be terminated in its design impedance, but the informal way I think about is: a tube amp "doesn't mind" a low-impedance or shorted output because of the natural "air gap" in the circuit - there's only so many electrons you can shove through that vacuum. It "hates" a high-impedance or open output because, as you said, the voltage can sail up through the roof. A transistor amp is just the opposite - there's a "solid" connection in the output transistor, so it can deliver lots of power into a low-impedance or shorted output, possibly cooking the transistor. A high-impedance or open output draws little or no power at all, so the transistor doesn't have to do much work. As you said, the voltage can still go up, but the positive rail is nowhere near as high as it is with a tube amp, so it's less likely to cause a problem. Again, this explanation is making the electrical engineers in the audience cringe, but as one writer said, "This is not exactly correct, but I'm telling you a story, not making an engineering analysis." Matt Roberds |
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Pace underdash 8 track player instalation instructions
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