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Thread: Pass Labs X350.5 Stereo Power Amplifier Review

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    admin is offline Administrator admin should be listened to
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    Arrow Pass Labs X350.5 Stereo Power Amplifier Review

    The Pass Labs X350.5 350 watt/ch stereo amplifier has the appearance like it was sculpted by Cybertronians. It portrays a commanding presence that just draws your attention. The X350.5 is built like a tank, pegging the scale in the pride of ownership department and weight (132 lbs). Its pristine sonic virtues and ability to drive even the most challenging of speaker loads beyond reference levels is even more impressive than its overall excellent bench test results. But, its power hungry demeanor and luxurious pricing isn't for the faint of wallet. However, I'm confident if Optimus Prime were an audiophile, it's a sure bet the X350.5 would be his amplifier of choice. Audiophile & Audioholics recommended!


    Discuss "Pass Labs X350.5 Stereo Power Amplifier Review" here. Read the article.

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    haraldo (10-26-2012),Irvrobinson (10-23-2012),its phillip (10-24-2012)

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    Wow. Look at that 1W FFT plot. Distortion is about 20db *less* than the Emotiva XPA-2. That's amazing. I'm not sure the difference is audible, but that's very good performance.

    If you want to test amps like this, Gene, you need to run a 30 amp circuit.

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    Quote Originally Posted by Irvrobinson View Post
    Wow. Look at that 1W FFT plot. Distortion is about 20db *less* than the Emotiva XPA-2. That's amazing. I'm not sure the difference is audible, but that's very good performance.

    If you want to test amps like this, Gene, you need to run a 30 amp circuit.
    Yea I wish I had that luxury. 30A wouldn't help in this case though b/c the real limitation is the 1.5KVa transformer when driving 4 ohm loads. Also, the amps max power consumption is 1800 watts so running a continuous power test for 4 ohms, both channels driven at 700 watts would consume roughly 2500 watts which this amp cannot do steady state.

    At low power levels, you are seeing the advantages of Class A. This amp sounds great but it's also a bit power hungry b/c of the heavy Class A bias.
    Gene DellaSala
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    Quote Originally Posted by gene View Post
    Yea I wish I had that luxury. 30A wouldn't help in this case though b/c the real limitation is the 1.5KVa transformer when driving 4 ohm loads. Also, the amps max power consumption is 1800 watts so running a continuous power test for 4 ohms, both channels driven at 700 watts would consume roughly 2500 watts which this amp cannot do steady state.
    Which is odd, because Pass rates this amp as 700W/ch into 4 ohms, and I suppose the naive (like me) just assume they mean both channels driven.

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    Quote Originally Posted by Irvrobinson View Post
    Which is odd, because Pass rates this amp as 700W/ch into 4 ohms, and I suppose the naive (like me) just assume they mean both channels driven.
    As I stated in the review, they don't really specify both channels driven. Regardless, still lots of power on hand.
    Gene DellaSala
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    Ill take 2!!! Oh wait they are $11000.00US each, never mind, how much just to rub my XPA5 on it for a couple minutes, maybe some of that non audible 20% will rub off...

    Good job with the review..
    How would it compare to 5 XPA1's and a brand new Jetski? lol, I really like the look of it, but I think I could pay a local metal artist $500 to make me a new enclosure for an EMO..., stainless with blades on it, and a bottle opener for my BEER..
    Theater- Emotiva UMC1 pro, ERC2, XPA5 amp, Ascend 340se frnts & cntr, 200se srds, HSU VTF2, PS3, LG 55" LED, & Harmony remote

    Whole house system UPA200 amp, vol. controls, d-box, 6 zones- Yamaha speakers

    Front parlor-2.2 system- XDA1 dac, XPA2 amp, Pure i20 dock, 2 sw300 subs, WD EVO2-40's

    Lwr parlor-2.2 system- Wharfedale Jade 5's, 2 sw300 subs, XPA2

    GYM- EVO2-8's, carver monoblox, wd sub

    bedrm- Jolida 202 tube amp, tekton lores,D1 DAC

    PC-Emo MiniX,CBM170's,12" Sub,D1 DAC

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    I love the looks of it. The reality is that I'd snap my back trying to lift it, all while cutting off a hand on the heat sink fins. That just might be worth it, though...

    Richard Marx...wow...that's a trip back in time right there.

    Of course, I'm jealous. I suspect that I'll never buy an $11k amp, even if it was going for the outrageously good price of $5k. Give me a second...okay, I've made my piece with it.
    Mains and Surrounds: NHT 1.5s, Center: NHT AudioCenter-1, Subs: SVS PC13-Ultra, SB13-Ultra, Receiver: Pioneer Elite VSX-23, Amps: Emotiva RPA-1, POS-1, Display: Panasonic TC-P50G10

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    awesome amp and review
    Living Room: Denon AVR-4520, Outlaw 770 Amp, Panasonic DMP-BD77P-K, Precise Acoustic Monitor 10 speakers Front, Infinity Beta 360 Center, Infinity Beta 50,Infinity IL10 Surround, Velodyne CT-150 Subwoofer,Theater Solutions 15 inch sub, Samsung 67" LED RP TV, ASUS-OPLAY/ Western Digital My Book World 1 TB
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    Quote Originally Posted by ImcLoud View Post
    Ill take 2!!! Oh wait they are $11000.00US each, never mind, how much just to rub my XPA5 on it for a couple minutes, maybe some of that non audible 20% will rub off...
    Not 20%, 20 decibels. That's 10,000%.

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    gene (10-24-2012)

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    Quote Originally Posted by gene View Post
    This amp sounds great but it's also a bit power hungry b/c of the heavy Class A bias.
    You can say that again. 500-600 watts just to idle is quite a lot by any measure. Still, if you can afford it and you are environmentally conscious, you can probably afford the means to offset the usage.

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