New Pass Labs XA25
- Thread starter kzhtoo
- Start date
Re: New XA25
[FONT="] Output power: [/FONT]
[FONT="] 2x 25 Watts Class A @ 8 ohms[/FONT]
[FONT="] 2x 50 Watts Class A @ 4 ohms[/FONT]
[FONT="] 2x 100 Watts Class A/AB @ 2 ohms[/FONT]
[FONT="]- Distortion: 0.1% @ 25 Watts, 8 ohm, 1 KHz, 0.1% @ 50 Watts, 4 ohms, 1 KHz[/FONT]
[FONT="]- Freq. Response: DC to -3 dB @ 200 KHz[/FONT]
[FONT="]- Gain: 20 dB gain[/FONT]
[FONT="]- Noise: Output 100 uV unweighted 20 to 20 KHz[/FONT]
[FONT="]- Damping Factor: 200[/FONT]
[FONT="]- Slew: 100 V/uS[/FONT]
[FONT="]- Input Impedance: 47 Kohm[/FONT]
[FONT="]- Peak Current: 10 Amp output (200 Watts into 2 ohms)[/FONT]
[FONT="]- Independent of loudspeaker load phase.[/FONT]
[FONT="]- Idle Power draw: 200 Watts total.[/FONT]
[FONT="]- Dimensions: 17”W x 17.375”D x 6”H[/FONT]
[FONT="]- Weight: approx. 55 lbs[/FONT]
[FONT="] Output power: [/FONT]
[FONT="] 2x 25 Watts Class A @ 8 ohms[/FONT]
[FONT="] 2x 50 Watts Class A @ 4 ohms[/FONT]
[FONT="] 2x 100 Watts Class A/AB @ 2 ohms[/FONT]
[FONT="]- Distortion: 0.1% @ 25 Watts, 8 ohm, 1 KHz, 0.1% @ 50 Watts, 4 ohms, 1 KHz[/FONT]
[FONT="]- Freq. Response: DC to -3 dB @ 200 KHz[/FONT]
[FONT="]- Gain: 20 dB gain[/FONT]
[FONT="]- Noise: Output 100 uV unweighted 20 to 20 KHz[/FONT]
[FONT="]- Damping Factor: 200[/FONT]
[FONT="]- Slew: 100 V/uS[/FONT]
[FONT="]- Input Impedance: 47 Kohm[/FONT]
[FONT="]- Peak Current: 10 Amp output (200 Watts into 2 ohms)[/FONT]
[FONT="]- Independent of loudspeaker load phase.[/FONT]
[FONT="]- Idle Power draw: 200 Watts total.[/FONT]
[FONT="]- Dimensions: 17”W x 17.375”D x 6”H[/FONT]
[FONT="]- Weight: approx. 55 lbs[/FONT]
New XA25
As you are all very aware Pass Labs build amplifiers with excessive output stages, lots of heat sinking and impressively capable power supplies. They are reliable, measure well and sound great.
Nelson says the Xa-25 embodies all these attributes and less, and in Nelson-esq that really is an impressive accolade to bestow upon a product.
The lower power application allows for an elegantly simpler "singe ended" front end, with fewer parts in the signal path, improving both speed and stability. The Xa-25 is stable into very low impedance's as well as reactive loads.
The circuit operates with less feedback, deeper into class A. with enhanced thermal stability. There are no DC servos or frequency compensation anywhere in circuit; design details that are strictly in service of the listening experience.
Where the Xa-25 really deviates from our larger wattage amps is the output stage, itself. Rather than requiring many parallel devices, each channel has a single robust industrial FET rated for 700W and 40A of current. This singe device allowing for a direct couple to the speaker without any bias resistors, for the lowest possible distortion figures and the highest possible damping factor. The result is dynamic impact and contrast well beyond what the 25W rating would suggest.
In a world where great specs are often followed by dry and boring, the Xa-25 breathes new life into music. But having said that, it's metrics are pretty stunning, too.
2 X 25 Watts Class A into 8 ohms at 0.1% THD + noise
2 X 50 Watts Class A into 4 ohms at 0.1% THD + noise
At lower wattage output levels the figures are better still, significantly!
Input impedance 47k-ohm
Bandwidth DC to -3dB @ 200 kHz
Gain 20 dB
Damping factor 200
Idle current 200 Watts
Physical size approx 17" x 17" x 6"
weight approx 55 lbs
Projected MSRP of $4995
Sent from my iPhone using Tapatalk
As you are all very aware Pass Labs build amplifiers with excessive output stages, lots of heat sinking and impressively capable power supplies. They are reliable, measure well and sound great.
Nelson says the Xa-25 embodies all these attributes and less, and in Nelson-esq that really is an impressive accolade to bestow upon a product.
The lower power application allows for an elegantly simpler "singe ended" front end, with fewer parts in the signal path, improving both speed and stability. The Xa-25 is stable into very low impedance's as well as reactive loads.
The circuit operates with less feedback, deeper into class A. with enhanced thermal stability. There are no DC servos or frequency compensation anywhere in circuit; design details that are strictly in service of the listening experience.
Where the Xa-25 really deviates from our larger wattage amps is the output stage, itself. Rather than requiring many parallel devices, each channel has a single robust industrial FET rated for 700W and 40A of current. This singe device allowing for a direct couple to the speaker without any bias resistors, for the lowest possible distortion figures and the highest possible damping factor. The result is dynamic impact and contrast well beyond what the 25W rating would suggest.
In a world where great specs are often followed by dry and boring, the Xa-25 breathes new life into music. But having said that, it's metrics are pretty stunning, too.
2 X 25 Watts Class A into 8 ohms at 0.1% THD + noise
2 X 50 Watts Class A into 4 ohms at 0.1% THD + noise
At lower wattage output levels the figures are better still, significantly!
Input impedance 47k-ohm
Bandwidth DC to -3dB @ 200 kHz
Gain 20 dB
Damping factor 200
Idle current 200 Watts
Physical size approx 17" x 17" x 6"
weight approx 55 lbs
Projected MSRP of $4995
Sent from my iPhone using Tapatalk
Re: New XA25
An XA25 and a pair of Uno XD's anyone?
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An XA25 and a pair of Uno XD's anyone?
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Kuoppis
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audiophil
New member
Sort of reminds me of a First Watt, all grown up.
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Anyone have this yet or are you thinking about buying one? I'm so curious how it compares to my Accuphase A-36 (which I love dearly and have been using for the past month or so).
I'd like to get an idea of how it sounds. Might be time for a demo.
I'd like to get an idea of how it sounds. Might be time for a demo.
harleyguy
New member
I agree to me this seems kind of like Nelson is taking one of his First Watt designs and bringing it to the Pass name, Not sure if this is the case as I haven't studied the design yet. With the Audiophile community getting back into the high sensitivity speaker game an amp like this one seems to be good timing, they should sell well
Randy Myers
Well-known member
This looks to be almost exactly a First Watt F6 with a fancier case. Nelson has said that many times Pass Labs benefits from designs he comes up with in his personal playground (First Watt)... this looks to be the case... judging from the First Watt F6 I am listening to right now I would say this amplifier will sound amazing!
Randy Myers
Well-known member
Just wanted to add that Nelson told me that the Pass XA25 and the First Watt F6 are not related and were designed separately. They are very similar is design, looks, features, and specs; therefore I do feel that performance should be similar as well however.
harleyguy
New member
Good to know. They do look a lot alike though
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Randy Myers
Well-known member
Yea, and I would be think that they probably sound virtually identical as well. Even though the Pass was designed separately I would believe that the design perfected in the F6 was generously borrowed upon for the XA25 
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Kuoppis
New member
- Joined
- Jan 19, 2015
- Messages
- 5,203
The more I think of it, the more I like the idea.
Tube pre with that, any suggestions?
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