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Old 31st March 2006, 01:51 PM   #11
jam is offline jam  United States
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K-Amps,

Yes the X-350 is a balanced bridged amplifier.............It should be stable into two ohms. I've seen it drive all kinds of loads from Magnapans to Sound Lab electrostatics.

As for rail voltages I would hazard a guess of abour +/- 50 volts accounting for losses.

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Jam
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Old 31st March 2006, 04:41 PM   #12
MikeW is offline MikeW  United States
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Jam, I thought they Sin Bin'd your ***.
Did Nelson get you out on double secret probation?
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Old 31st March 2006, 07:11 PM   #13
jam is offline jam  United States
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Mike,

No...............I am under moderation. For some reason I think the moderators consider me a troublemake.............

Jam
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Old 31st March 2006, 09:09 PM   #14
K-amps is offline K-amps  United States
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Quote:
Originally posted by jam
K-Amps,

Yes the X-350 is a balanced bridged amplifier.............It should be stable into two ohms. I've seen it drive all kinds of loads from Magnapans to Sound Lab electrostatics.

As for rail voltages I would hazard a guess of abour +/- 50 volts accounting for losses.

Regards,

Jam
Thanks Jam.

Are there any specs for it into 2 0hms? I know the pass labs site says current limited to 20 amps... so does that mean I can get a max of 950 watts into 2 ohms before the limit begins?

Also what is the class of output? High bias? SE? Push/pull class-A?

What is the idle bias?

thanks!

Oh yes... compared to my bipolar Krell KAV-250a, what differnce in sound do u think I'd expect?
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Old 31st March 2006, 10:10 PM   #15
jam is offline jam  United States
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K-amps,

I assume you can get close to that if only one clannel is driven, the power is limited by the transformer (1500 VA).

I believe the amp is class-A up to about 40 or 50 watts which is fairly high bias and the output stage is complementary push-pull.

I am not what the bias current is but I believe the unit dissipates about 400-500 watts at idle.

I have tried the Krell and the only advantage the Krell might have is slightly more slam in the bass(but is it real). The Pass otherwise kills the Krell IMHO. Just a lot more musical, less smear, less sibilance, more depth.....and the list goes on.

You owe it to yourself to hear one.

Regards
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Old 31st March 2006, 10:35 PM   #16
K-amps is offline K-amps  United States
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Jam,

I tried Nelson's other amps. Loved the 5x5 adcoms, but not the 5802. It smears the music. The highs do not sparkle, they kind of blur together... akin to looking out your window while it is raining... I have always had issues moving away from BJT's. the krells do not give much to fault... albeit not saying they can't be bettered...

I cannot hear an X350 anywhere near... so I am going to have to take a leap of faith.

K-
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Old 1st April 2006, 03:41 AM   #17
jam is offline jam  United States
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K-Amps'

Mr. Pass would never produce a bad sounding amp. The 5800 is his design the 5802 was someting Adcom came up with. The 5800 is a far better amp.
Take my word for it the X350 is one heck of an amp. you wont be sorry.

Regards,

Jam
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Old 1st April 2006, 01:04 PM   #18
K-amps is offline K-amps  United States
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Agreed, I have heard the 5800 and liked it very much... but that was over 10 years ago, and my memory is not that great
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Old 1st April 2006, 02:07 PM   #19
AndrewT is offline AndrewT  Scotland
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Hi Kamps,
that 20A limit is presumably a peak limit.

The max peak power into a 2ohm load is Isqrd*R =20*20*2=800W.
The maximum rms power = peak power/2 = 400W.
But your speaker has a 1.5ohm minimum, so theoretically, your maximum rms power is 300W at the frequency that the 1.5r occurs.

The Krell fuses (PSU supply rail fuses?) must be allowing a minimum of 75Wrms into your 1.5r load, but more likely nearly double (15Apk) or quadruple (20Apk) this to blow the fuses.
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Old 1st April 2006, 03:15 PM   #20
K-amps is offline K-amps  United States
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Thanks!

The fuse thats blows is in the speaker line, not the PSU fuses. I know it can handle larger fueses without blowing up, but why bother...
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