Help, I need to build a signal pad, I want it to be perfect, looking for advice. - diyAudio
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Old 30th March 2015, 09:49 PM   #1
diyAudio Member
Join Date: Mar 2015
Default Help, I need to build a signal pad, I want it to be perfect, looking for advice.

Hello, this is my first post!

Basically whats going on with me is I want to record mixes off a TASCAM 488 into an MPC-2000, and a boss RC-3. It's not important if you don't know the gear but the TASCAM 488 has the analog audio, and I can record the output with either the MPC-2000 or the RC-3 for different results. The trouble is the 488 is way too loud, reducing the volume on the console itself weakens the mix

488 mk II [SOURCE #1, TASCAM 488 Specifications /, also confirmed with official manual]
PHONES (1/4" stereo phone jack x 1)
Nominal Load Impedance: 30 ohms
Maximum Output Level: 100 mW (approx.)

Headphone Output: 100 mW + 100 mW max. [I'm not 100% sure if this last bit of info is correct]

AKAI MPC-2000 info. [akai mpc-2000 product manual, verison 1.0]
Record input (both L and R) :
1/4-inch stereo phone x 2, balanced -40dBu,
input imp. 39kΩ
Max. input level +10dBu

Boss RC-3 [source, boss rc-3 official manual]

Nominal Input Level: -20 dBu
Input Impedance: 1 M ohm

Recommended Load Impedance: 10 k ohms or larger

How could I use this info to help build the correct signal pad?

Thanks for any help!
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Old 31st March 2015, 09:24 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
reducing the volume on the console itself weakens the mix
What does this mean?

How does the "console" reduce the volume?
What does "weakens" mean?

If the Receiver is analogue then an analogue attenuator will control the volume.

Is any of the equipment balanced?
For recording without worrying about interference, most would opt for balanced impedance connections.

receiver spec:
Nominal Input Level: -20 dBu
Input Impedance: 1 M ohm
-20dBu is tiny. You seem to have the wrong device.
Did you read the spec before you acquired it?
0dBu is 0.7747Vac
-20dBu is 77.47mVac

tascam seems to be unbalanced and mentions -10dBV (300mVac)
Akai is stated as +10dBu = 2450mVac

You need to find out what "nominal" means for the two and what "max" means
regards Andrew T.

Last edited by AndrewT; 31st March 2015 at 09:31 AM.
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