Robinette Box

https://robrobinette.com/RobinetteBox.htm

It lets you listen to headphones with your speaker amp. Since I'm no longer in a position to listen to speakers, I'm very glad to have ran across this. Any thoughts would be appreciated. I'm not averse to DIY, actually I quite enjoy it but if the price is right I'd prefer to buy it. Optimal parts suggestions?

 

If you want to be gung-ho about it, any non-inductive wirewound power resistor should work fine.

All that being said, if you dont need any of the SE-Bal stuff or the bypass, this can be greatly simplified.

The premise is a voltage divider with 6 ohms as the top R and 2 ohms in parallel with the headphone load in the lower position. Pretty simple.

 

Oh jebus, not this thing again. Hooray a box that can blow up my amp with the flip of a switch if I don't know what I'm doing! The whole thing is just an L-pad with unnecessary components and a really bad idea for a merged ground channel.

Get an enclosure. Connect speaker outs directly to a 4pin XLR. No switches, no resistors, nothing. If your amp is too powerful/has too much noise, then get a different amp (or just spend the $100 on an actual headamp).

 

I forgot to mention I built my amp from a kit. This is basically what it looks like. Armaegis you might be onto something. 1) I will be running Bughead Emperor in black screen so no digital volume control BUT 2) I have two manual controls at my disposal, on on the iFi idac and one on this. I could have both on low and avoid the resistors, right?

I'm not ashamed to admit my background knowledge is bad, really bad. Feilb I really would have been clueless to implement anyway. I can do step by step, that's it.


T

 

What's the power output on that amp? (looks like an AudioSector gainclone?)
If it's something like 20W, you shouldn't be too worried. Just keep volumes low to start and see where it goes from there.

 

Yes that's the one and it's 50 W. Is that too much even with the 2 volume controls? My working plan is to remove a binding post and add a switchcraft 1/4" socket.

 

NOOOOOOO!!! SOMEONE BROUGHT UP THAT STUPID NAME AGAIN! Let RobRob and his stupid box die already!

 

50W is fine. Just start with levels at zero and go up from there.

Does that amp even have a shared ground? If not, then don't smoosh the grounds together with a 1/4" jack. Just leave the amp as is and build an XLR4 adapter (assuming your headphone is wired for "balanced").

 

Damn dog. Well anyway I got in touch with Peter Daniels the designer of the amp. I can indeed go out through the speaker outs.

Not sure but thanks for pointing this out. Cool stuff. I'll post an update when I'm done. First I have to figure out why my channels are crossed, I never got around to fixing that.

 

Channels crossed? You mean your left and right are swapped?

 

Yes.