How to connect Teac CD-RW890 to Realistic MPA-40

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drhodges10

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Sep 5, 2013
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I've tried every way of switching the cords, for connection, to record my Pastor's sermon from the microphone amplifier Realistic MPA-40 onto the Teac CD-RW890. It acts like it's recording. I have gone through 3 discs and up to 7 tracks on one and still no sound. Can anyone help?
 
Solution
nukemaster
Well, I think i see the issue. You are tying to record from a Line-in.

The AUX is an input NOT and output.

Now for the interesting part.

Are you up for some DIY? I would only do this if your speakers are normal 4-16 ohm range. I have never seen this used for 70 volt. This is just a voltage devider to DROP the voltage down to a level that will not kill your recorder(you will need to use a y cable to turn this MONO output into a "stereo" input[not that it is rear stereo].).
http://www.epanorama.net/circuits/speaker_to_line.html
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nukemaster

nukemaster

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Nov 23, 2004
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I think we are going to need exact info on how it is connected.

Is it MIC -> Mic Amp -> Aux in on MPA-40's AUX in? -> Speakers

If you you need to get your recorder in after the mic amp. It would run in parallel with the MPA-40(if they are both very high resistance loads like 10k it should not cause any issues, but you are best to PRE test this before hand.).

It would be something like

MIC -> Mic amp -> Y-cable -> MPA-40(connected to speakers) AND your recorder.

If the recorder is ALWAYS on, you may be able to go like this

MIC -> Mic amp -> Recorders line(analog) in -> Recorder line(analog) out to MPA-40 -> MPA-40 to speakers. This has the advantage of also allowing CD's to be played over the PA system.

EDIT, If you have CD-RW discs you can test with those as to avoid wasting cd's while setting up.
 
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drhodges10

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The way it's connected now is MIC->MPA-40->MPA-40 Aux L & Aux R (Radio Shack's white & red cords)->Analog In L & R of the CD-RW890.
 
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nukemaster

nukemaster

Titan
Nov 23, 2004
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74,965
Well, I think i see the issue. You are tying to record from a Line-in.

The AUX is an input NOT and output.

Now for the interesting part.

Are you up for some DIY? I would only do this if your speakers are normal 4-16 ohm range. I have never seen this used for 70 volt. This is just a voltage devider to DROP the voltage down to a level that will not kill your recorder(you will need to use a y cable to turn this MONO output into a "stereo" input[not that it is rear stereo].).
http://www.epanorama.net/circuits/speaker_to_line.html
 
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Solution
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drhodges10

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Sep 5, 2013
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Thank you so much. That explains everything. Any suggestions on what I should do?
 
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drhodges10

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Sep 5, 2013
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WOW!!! You are awesome. I'm going to check it out. I clicked on the link you provided and believe I can follow it. It will take me a couple of days to get back to the machine to try it out. But, when I do, I'll post an update. Thank you again.
 
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nukemaster

nukemaster

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Nov 23, 2004
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Again, please modify this if you are using the "70 volt" out on the PA amp(as in its current 10:1 divider you would 7 volts and that is too much for the cd recorder. something like 40:1(40k resistor) would get you under 2v at 1.75v).

Please note this value changes with the volume of the amp. start big and work down if needed.
 
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felix666

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Sep 14, 2011
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Gee I remember tinkering an intercom using an MPA-40, some 30 years ago... it has no "mic out" connector. You can use the voltage-reducing resistor between the GND and the 4 ohm out signal, independently of which other connection the speaker uses.
Also, TEAC says that the recorder only records on these more expensive CDs that are labeled "for audio recordings", because of copyright issues. I don't know if it can still do it on regular CDs, or if it really does check for some ID from the blank disk, so if you still get no sound it may be one more thing to verify.
 
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drhodges10

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Sep 5, 2013
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Lol... You are absolutely correct that this is an extremely old amp! So, you're suggesting I should use the 4Q and COM output or the 4Q and 8Q? And I did purchase the special CD (CD-DA) for it.
 
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drhodges10

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Sep 5, 2013
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The back of the MPA-40 has the following outputs 70V, 16Q, 8Q, 4Q and COM. What does Q mean and which should be used to lower the level?
 
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