Seventh Circle Audio

On the description of this unit it states "Optional output transformers provide for superior isolation when reamping." So if you stick a optional transformer in this DI it can be used as a reamping unit (like a radial x-amp.) If so what type of transformer is needed?

anyone?

Jensen JT-MB-CPC will work.

If you look at the D11 BOM, it lists a Cinemag CMMS-2-PCA. I contacted Cinemag, and the CMMS-2 doesn't come in a PCA version. They are willing to make one if they get an order of at least 1000. Looks we won't see one anytime soon.

To bad, because the Cinemag is cheaper than the Jensen.

So by adding the tranny option the D11 can be used for re-amping, as in it will take LINE level signal and convert it to instrument level? I wonder about this re-amping possibility, it makes this very versatile module even more exciting.

I got a shipping confirmation from Tim today, so I'm really excited to build and use this DI.

Best to all,

Rey

reypina \$m[1]:So by adding the tranny option the D11 can be used for re-amping, as in it will take LINE level signal and convert it to instrument level? I wonder about this re-amping possibility, it makes this very versatile module even more exciting.



Rey

'
Thats exactly what I want to know.

Whats the word on this Tim?

I just got an email from Cinemag. Turns out that Tim contacted them a while back about the PCA version of the CMMS-2. They should be out soon! Good news as the Jensen equivalent is almost twice the cost! (assuming the PCA version is close to the same cost as the non-PCA version)

Cool, thanks for the info, Jack.

So if you stick a optional transformer in this DI it can be used as a reamping unit (like a radial x-amp.)

Not exactly. Boxes built specifically for reamping like the x-amp and the Reamp have output impedances that are meant to mimic the output impedance of a guitar pickup. The claim is that this results in a more accurate interaction between source and amp. The D11's outputs are meant to mimic the output impedance of a microphone. You could try adding a 4K7 resistor in series with the guitar amp input to see just how audible the difference is.

So by adding the tranny option the D11 can be used for re-amping, as in it will take LINE level signal and convert it to instrument level?

The D11 knocks down the input level about 20 dB, so it's possible to go from +4 dB line level to -16 dB instrument level. Keep in mind that the line level source will be happiest driving the D11 input when it's switched to 10K input impedance. The D11 output is low-impedance and balanced.

Tim contacted them a while back about the PCA version of the CMMS-2.

We'll have the CineMag transformers available as an option eventually. In the mean time, the Jensen parts work great. Keep in mind that a transformer isn't strictly necessary for reamping. It will improve isolation and possibly eliminate hum in some situations, however.

Hello folks. I want to see if I got this right. To use the D11 as a re-amp box I would take a balanced signal from my audio interface using a 1/4" TRS to TS cable to the a input jack of the D11. Set the impedance to 10K. Then I would use a XLR to TS from the output of the D11 to the input of a guitar amplifier (with the 4K7 resistor Tim mentioned if desired).
Does this sound correct to anybody?

Thanks,
rey

Does this sound correct to anybody?

Exactly

Thanks Tim!

reypina \$m[1]:Hello folks. I want to see if I got this right. To use the D11 as a re-amp box I would take a balanced signal from my audio interface using a 1/4" TRS to TS cable to the a input jack of the D11. Set the impedance to 10K. Then I would use a XLR to TS from the output of the D11 to the input of a guitar amplifier (with the 4K7 resistor Tim mentioned if desired).
Does this sound correct to anybody?

Thanks,
rey

I'm confused by this post, to reamp wouldn't the output of the audio interface be connected to the output of the D11, and the amp to the input of the D11 (low -> high impedence) Bacically using the D11 backwards from how it would be used as a DI box?

wouldn't the output of the audio interface be connected to the output of the D11

The D11 is an active device, not a transformer. You can't connect it "backwards".

That's what I thought, but reamping involves +4 -> high impedance guitar level which is why I was confused by the post. Using it as described would be backwards based on the diagrams here http://www.reamp.com/applications_images/Diagram-2_lrg.jpg

How so? The D11 will take a +4 signal down to -20 or so and be happy driving any stomp box all day long. The great majority of balanced line outputs are perfectly fine driving the D11s unbalanced input, and the D11s balanced output is perfectly fine when connected to an unbalanced input, especially with the optional transformer(s). The point is that you can use the D11 for basic reamping chores if you haven't got a dedicated box, or haven't got enough of them. If you need a more convincing imitation of an actual guitar pickup, a Reamp-type box is the way to go.