Quote Originally Posted by MartinT View Post
Stan - one question I don't think I've seen the answer to: will the passive outputs drive 10k inputs? In other words, is there a little grunt behind them?
The DAC can handle amplifiers that have an input impedance of 1K or higher.
As for grunt: I haven't noticed any lack of that in my system. But no doubt when the Bushmaster is used by more and more people, we'll get a far wider bunch of data to work from.

The planned add-on upgrade box with variable output will however have a very low output impedance that will be suitable for even the most demanding power amps. The problem that I face however is whether the cost of the add-on box will be an economical option for those who need a variable output. I am guessing on the price at this stage, but assuming it costs an extra £100 for the add-on box, such an upgrade would have to be worth the extra outlay in order for it to sell in sufficient quantity and justify its development and production. Ideally I would have liked to just add the variable stage onto the Bushmaster PCB, but this would have raised the cost of the DAC and burden potential buyers with an unneeded function for which they still had to pay. It looked to me like robbing Peter but not paying Paul, so to speak.

It's a tricky one for me, so any "for" and "against" opinions on the add-on box would be most welcome.