Hi,
This may be a very simple question and perhaps something already tackled before (forgive me - I did search, but couldn't find anything conclusive)
As the title suggests, I have a Quad 707 and IQaudIO Pi-DAC+ that I would like to operate without a pre-amp.
The issue being, that the Quad 707 has an input sensitivity of 0.775V and the IQaudIO Pi-DAC+ has an output of 2V RMS.
Ideally, the volume control would be via the hardware control on the Pi-DAC+. I have tested this and it has proven to be very reliable (so far) in that it always boots into the saved state which is default at 20%.
To connect directly to the Quad, would it be sufficient to use a voltage divider? Using a divider with 10KOhm and a 6KOhm ( 0.5W 1% Vishay Metal Film) would give me a result of 2V to 0.75V - is this a sensible option?
I did consider an inline attenuator (such as Attenuators ) but these are 10db. I think this would give me a reduction from 2v > 0.63v. So may loose a bit too much?
Any suggestions gladfully welcomed 🙂
This may be a very simple question and perhaps something already tackled before (forgive me - I did search, but couldn't find anything conclusive)
As the title suggests, I have a Quad 707 and IQaudIO Pi-DAC+ that I would like to operate without a pre-amp.
The issue being, that the Quad 707 has an input sensitivity of 0.775V and the IQaudIO Pi-DAC+ has an output of 2V RMS.
Ideally, the volume control would be via the hardware control on the Pi-DAC+. I have tested this and it has proven to be very reliable (so far) in that it always boots into the saved state which is default at 20%.
To connect directly to the Quad, would it be sufficient to use a voltage divider? Using a divider with 10KOhm and a 6KOhm ( 0.5W 1% Vishay Metal Film) would give me a result of 2V to 0.75V - is this a sensible option?
I did consider an inline attenuator (such as Attenuators ) but these are 10db. I think this would give me a reduction from 2v > 0.63v. So may loose a bit too much?
Any suggestions gladfully welcomed 🙂
I don't see why not ,taking into consideration the output impedance.
You have a very good DAC for the money even guys with more expensive ones acknowledge that and you have ( joy ! ) ALSA drivers my favourite computer audio ( I know I am biased ).
You have a very good DAC for the money even guys with more expensive ones acknowledge that and you have ( joy ! ) ALSA drivers my favourite computer audio ( I know I am biased ).
Thanks Duncan - that’s sealed it for me then! I have to admit, even just using a standard switched mode PSU it sounds fantastic. Compared to a quite high end CD player (£1k+ when new) it’s hard to discern the better of the two. For less than £100 all in with the Raspberry Pi and other bits I can’t fault it. I have toyed with the idea of a more expensive linear PSU, but after a trial run isolating the mains supply and using a battery pack - I can’t tell the difference.