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Page 13

X150 SPECIFICATIONS

All figures obtained after 1 hour warmup, with regulated 120 VAC power line. See manual
notes about AC power line regulation.

Gain

30 dB

Freq. Response

-0 dB at DC, -3 dB at 100 kHz

Power Output

150 watts maximum @ 1% THD, 1 kHz, 8 ohms

Distortion

refer to accompanying distortion curve

Maximum Output Voltage

plus, minus 50 volts

Maximum Output Current

plus, minus 20 amps

Input Impedance

22 kohm balanced

Damping factor

250

ref 8 ohms nominal

Slew rate

plus, minus 50 V/uS

Output Noise

300 uV unweighted 20-20 kHz

Random noise floor

approximately 2 uV

Dynamic range

145 dB (random noise floor to peak output)

Balanced CMRR

-85 dB @ 1 kHz (input common mode rejection ratio)

DC offset

< 100 mv

Power Consumption

200 watts idle, 600 watts maximum

Temperature

20 degrees C. above ambient at idle

Dimensions

19 " W x 20" D x 6.5" H

Shipping Weight

70 lbs.

PASS

Pass Labs

PO Box 12878

Reno NV 89510-2878

www.passlabs.com

tel:

(530) 367 3690

fax:

(530) 367 2193

Содержание X150

Страница 1: ...Page 1 Pass X150 Owner s Manual ...

Страница 2: ...istorted signal Supersymmetry seeks merely to create perfect matching Matched balanced power circuitry typically sees a distortion and noise reduction of about 90 20 dB through a balanced connection without any additional effort The Supersymmetric circuit delivers another 90 reduction so that the X series has about 1 100 of the distortion of a conventionally simple amplifier Actually this ordinary...

Страница 3: ...the switch on up The lights in your house will blink when the power supply charges the capacitors On the front panel the Standby LED indicator should be glowing blue indicating that the power is on The Power LED should not be on If the Power LED is on don t get excited just use the front panel stand by button to go to stand by mode with the Standby LED on and the Power LED off OK so the amplifier ...

Страница 4: ... leave the rear connection open So much for essential information Speaker Interface The X150 is optimized for loads nominally rated at 4 ohms and above You can run the amplifiers into a lower nominal impedance without difficulty and we are not aware of a speaker on the market that presents unusual difficulty with these amplifiers The X amplifiers do not care particularly about the reactivity of th...

Страница 5: ...itions in the amplifier it will do about 1500 watts for short duration To avoid huge inrush of current during charge up each of the transformer primary coils has its own inrush suppressor which keeps the inrush down to 100 amps or so The X150 has 4 computer grade the old large style computer capacitor cans not the new dinky ones capacitor cans at 31 000 uF and 50 volts each These are used to creat...

Страница 6: ...d amplifiers operating in the field in excess of 20 years with no particular mortality except capacitors The answer is I don t have good information beyond that More to the point I would suggest that you not worry about it This is a conservatively built industrial design not a tweaky tube circuit run on the brink If it breaks we will simply get it fixed so sleep well Warranty Information This prod...

Страница 7: ...t with the result that the amplifier did not sound very good in spite of good distortion measurements Push pull circuits while allowing high efficiency and cheap manufacture did not improve the character of the sound at lower levels where we do most of our listening a deficiency which designers often use feedback to cover up It appears that the human sense of hearing is more subtle in some ways th...

Страница 8: ... with fast amplification high slew rate In retrospect the idea was at least half right but I believe not completely for the following reasons First it presumed that there was really fast signal in music Research conducted independently by Peter Walker and myself showed conclusively that real music contained very little signal with appreciable slew rate therefore slew rate limiting on the order pro...

Страница 9: ...e input look like the output in the conventional sense Instead it works to make two halves of an already symmetric balanced circuit behave identically with respect to distortion and noise dramatically lowering the differential distortion and noise but not the distortion and noise of each half of the circuit considered by itself If you build such a symmetric balanced circuit you get much of this ef...

Страница 10: ...terestingly the single ended nature of each half of the balanced circuit doesn t give rise to much in the way of odd order distortion and when the even order components and noise are cancelled there isn t much distortion and noise left In any case Balanced single ended is a phrase that accurately describes the circuit For the amplifier s front end a balanced single ended gain stage was developed w...

Страница 11: ...signal symmetry with respect to both the voltage and current axis and anti symmetry for distortion and noise This means that the distortion and noise of each half appears identically and cancels The diagram on the patent cover sheet shows an example of this topology Each of the two input devices 20 and 21 are driven by an input signal and their outputs run through a folded cascode formed by device...

Страница 12: ...unwanted components As long as the two halves are matched this performance tends to be frequency independent and does not deteriorate over the audio band With mid level distortion figures on the order of 002 this is very high performance for a single balanced gain stage The following pages include a typical distortion curve of the amplifier a list of specifications for the amplifier and where to r...

Страница 13: ...nus 20 amps Input Impedance 22 kohm balanced Damping factor 250 ref 8 ohms nominal Slew rate plus minus 50 V uS Output Noise 300 uV unweighted 20 20 kHz Random noise floor approximately 2 uV Dynamic range 145 dB random noise floor to peak output Balanced CMRR 85 dB 1 kHz input common mode rejection ratio DC offset 100 mv Power Consumption 200 watts idle 600 watts maximum Temperature 20 degrees C a...

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