Originally Posted by Shazb0t
So I am new to the whole head-Fi scene. I recently bought an O2 amplifier and a set of Q701's to use with my Titanium HD. I am a competitive fps player so having the x-fi chip is important to me.
I have hooked up the the O2 to the Titanium HD using RCA out from the card to 3.5mm input jack on the O2. I then am plugging the Q701 into the 3.5mm output jack on the O2. With the system volume for the Titanium HD set to 100% volume and the card set to headphones I have to turn the O2 volume adjustment knob to between 1.5-2.5 o'clock depending on the song to attain normal listening volumes. Is this normal? I was under the impression that the O2 would deliver a lot of power and that I wouldn't come close to maxing out the volume adjustment. I want to make sure I haven't messed anything up with the installation. Any information would be greatly appreciated.
Position of volume control is directly proportional to how much Voltage the headphone amp outputs.
Are you sure you have ALL the volume controls on the Titanium set to 100%?
I can easily listen to Q701s using an iPod or an iPad and turn the volume up as loud as I want.
OTOH, you seem to be OK with how the O2 is working.
The myth of the power hungry Q701 is just that...a myth.
Q701s are approx. 1 Volt = 105 dB SPL, (well probably less!) you wouldn't listen to an average level that loud.
This works out to approx. 0.316 Volts = 95 dB SPL, the O2 can easily output this.
I use an amp with set to gain of 10 dB (X 3.16), and I usually have the volume set to approx. 10-11 oclock. Maybe I listen quieter than you. My DAC outputs 2 Volts
For efficiency they are approx 1 milliWatt = 90 dB SPL. (there have been a few testers who think the manufacturer's efficiency and sensitivity specs are rather optimistic).
The O2 is more that capable of outputting 10 milliWatts into a pair of Q701.
A more powerful amp won't fix this. Which you obviously agree with!
Edited by Chris J - 1/6/13 at 4:47am