Designing an output pad for the A12

[RalphNicastro]

I have been thinking about designing an output pad for the A12, as I love the sound but it is a little hot on drums. I would like to design an output pad to take off 12db. I found a website with an explanation but I have a few questions. Would I need to use 1/4watt resistors or 1/2watt resistors? What is the output impedance of the A12?
Thanks for your help!

[tpryan]

Use a string of three 1/4W resistors, 220-150-220. Apply the signal across the whole string and take the -12dB signal across the 150 ohm resistor. Remove the jumper on the board at R38 - otherwise the module will be driving a 300 ohm load instead of a 600 ohm load.

[Randyman...]

I built some -6dB pads that worked well with Tim's input - but I also think I liked the ability to drive the outputs even harder with a -12 or -14dB pad. You should dig the sound IMO - Everyone always says "The sound of Rock Drums is API driven hard" - and padding the A12 into an A/D gets a good deal of that sound IMO. You will even get some light limiting (clipping) on the hard hits! I generally pad the Kick, Snare, and Overhead outputs into the A/D...

[RalphNicastro]

ok so you are suggesting a U pad design? If that is the case, the other set of numbers I found were 5k, 3.6k, and 5k for 12db reduction. What is the difference between these two sets of numbers?

[tpryan]

What is the difference between these two sets of numbers?

Assuming 0 ohms source impedance and very large load impedance:

220+150+220 = 590 ohms input Z, 150 ohms output Z
5K+3K6+5K = 13K6 ohms input Z, 3K6 ohms output Z

20*log(150/590) = -11.9 dB
20*log(3K6/13K6) = -11.5 dB

[RalphNicastro]

Your numbers make much more sense, I will go with those. I plan to use DPDT mini toggle switches on a blank rack panel to switch them in and out as needed. Are there any other things I should do other then remove the jumpers?