Hi I am getting an old Cyrus Q Power with the specifications below. My concern is of plugging it straight into the line out of the Squeezebox 3(soon to be a Duet) I found the wiki page http://wiki.slimdevices.com/index.cgi?ConnectToPowerAmp which states that the squeezebox3 will be 6 Vpp/2.1 Vrms but I am lost on how this applies to the amp specified below. I assume I need attenuators and ideally would like to have it sorted before I plug it in.
Does anyone understand this stuff and can tell me what I need, my current attempt at how it works is (first time I have used the log button on the calculator :-)) ...
SQ3 2.1v (max volume)
Cyrus Q 380mV (max)
so far looks like things are going to blow up,
dB = 20 * log ( .380 / 2.1 ) = -14.85
This will allow the full volume on the SQ3 to be the max the amp can handle. I assume a attenuator something like http://www.amazon.com/Harrison-Labs-...6482411&sr=1-1 but I will need 15 would be what I am looking for? Can I just daisy chain them together, i.e plug a 3db into a 12db to get 15db ?
Cyrus Q Power
Specifications
Continuous Power - 50W/CH (both driven into 8 Ohms) 70W/CH (both driven into 4 Ohms)
Frequency Response - -3 dB at 1Hz and 80kHz
Current - 30 Amps peak to peak
Sensitivity - (RCA input) 380mV (for 50W stereo into 8 Ohms)
Input impedance - 10Kohm (RCA)
Output voltage - 380mV (Chain out)
S/N Ratio - 110dBA
My speakers
M31
Specification
Enclosure type 2-way reflex loaded
Frequency Response (+/- 3dB) 65Hz-20kHz
Sensitivity (SPL/M @ 2.83V) 88dB
Cabinet Volume 7l
Impedance 8 Ohms compatible
Recommended Amplifier 25-75W
Dimensions (mm) 225 x 170 x 280
Included Accessory n/a
Optional Accessory1 Stancette
Optional Accessory2 n/a
Does anyone understand this stuff and can tell me what I need, my current attempt at how it works is (first time I have used the log button on the calculator :-)) ...
SQ3 2.1v (max volume)
Cyrus Q 380mV (max)
so far looks like things are going to blow up,
dB = 20 * log ( .380 / 2.1 ) = -14.85
This will allow the full volume on the SQ3 to be the max the amp can handle. I assume a attenuator something like http://www.amazon.com/Harrison-Labs-...6482411&sr=1-1 but I will need 15 would be what I am looking for? Can I just daisy chain them together, i.e plug a 3db into a 12db to get 15db ?
Cyrus Q Power
Specifications
Continuous Power - 50W/CH (both driven into 8 Ohms) 70W/CH (both driven into 4 Ohms)
Frequency Response - -3 dB at 1Hz and 80kHz
Current - 30 Amps peak to peak
Sensitivity - (RCA input) 380mV (for 50W stereo into 8 Ohms)
Input impedance - 10Kohm (RCA)
Output voltage - 380mV (Chain out)
S/N Ratio - 110dBA
My speakers
M31
Specification
Enclosure type 2-way reflex loaded
Frequency Response (+/- 3dB) 65Hz-20kHz
Sensitivity (SPL/M @ 2.83V) 88dB
Cabinet Volume 7l
Impedance 8 Ohms compatible
Recommended Amplifier 25-75W
Dimensions (mm) 225 x 170 x 280
Included Accessory n/a
Optional Accessory1 Stancette
Optional Accessory2 n/a
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