Bluguitar Amp 1 speaker out to resistor question...

[Enchilada Jones]

I read somewhere that the Amp 1 sounds best if you include the power amp section when running 'direct' to a cab sim. I also read that Thomas said the Amp 1 could be loaded down with a simple resistor to get the level low enough for that to be safe for what ever hardware you are hosting the cab sim with.

If those two statements are accurate I am wondering if the Two Notes Opus might be able to take it.

If anyone is familiar with this practice can you tell me if I'm right in thinking the amp input of the Opus meets the required 'pad' to make it safe?
The specs for Opus show the following:

AMP / INST / LINE IN	1/4″ Jack balanced (TRS)
Input Impedance	AMP	160kΩ unbalanced / 300kΩ balanced
LINE	37kΩ unbalanced / 55kΩ balanced
INST.	1MΩ unbalanced
Max Level (No Input Pad)	AMP	26.1dBu
LINE	11.3dBu
INST.	2.8dBu
Max Level (With Input Pad)	AMP	36.2dBu
LINE	20.8dBu
INST.	12.3dBu
Aux In	Connector	1/8” (3.5mm) TRS jack
Input Impedance	29kΩ

 

[jellodog]

Paging @laxu - I seem to recall that he knows something about that, or has done it; so hopefully he'll chime in.

We've got an Amp 1 here, but we've never tried loading it down from the speaker out. The line out really doesn't sound great though, so the speaker / power amp out is definitely the way to go.

 

[Enchilada Jones]

 

[Enchilada Jones]

Paging @laxu - I seem to recall that he knows something about that, or has done it; so hopefully he'll chime in.

We've got an Amp 1 here, but we've never tried loading it down from the speaker out. The line out really doesn't sound great though, so the speaker / power amp out is definitely the way to go.

I've used the Two Notes CaptorX on it and of course that has no problem with it. Sounds much better than using the line out. I'm hoping that -24 is enough but it is dangerous to trust my interpretation of low voltage schematics. I'm a mechanical contractor and work on big stuff so if it can't stop your heart I don't understand it

 

[laxu]

I've even run the Amp 1 straight to an audio interface! Thomas Blug recommends a -20dB pad for this but by leaving the main MV really low on the Amp 1, the -10 dB pad on my Focusrite worked alright.

It does sound better with a proper loadbox.

 

[Enchilada Jones]

I've even run it straight to an audio interface! Thomas Blug recommends a -20dB pad for this but by leaving the main MV really low on the Amp 1, the -10 dB pad on my Focusrite worked alright.

It does sound better with a proper loadbox.

Can you tell me by the pics I posted if that -24 is dB and it is on the amp setting of the three way toggle?

 

[laxu]

Can you tell me by the pics I posted if that -24 is dB and it is on the amp setting of the three way toggle?

I would guess. Set the Amp 1 MV to zero then turn it up slowly and see what kind of levels you get.