Question to Mr. Pass

Metric · 17th April 2005, 10:19 PM

Hi!
I am thinking about bying a second hand x250 to use with ML Summit. The panels on these speakers can reach 0.7 ohms. Will this be a problem for the x250?

Thanks,
Per Øyvind
Norway

Metric · 17th April 2005, 10:29 PM

Are the early x250 the same as the latest versions, or have they been opgraded at one time? From serial number xxxxx for instance?

Thanks again,
Per Øyvind

Nelson Pass · 18th April 2005, 05:15 PM

The X250 has been replaced by an update, the 250.5. It's
ability to drive the low impedance of the ML's is about the same.

The .7 ohm figure is not a difficulty, as it occurs up about 15 KHz
or so, where there is very little actual energy, so we don't see
it as a practical problem, as long as an amp is stable into the\
impedance, which the 250 is.

Metric · 18th April 2005, 05:23 PM

Quote:

Originally posted by Nelson Pass
The X250 has been replaced by an update, the 250.5.

But all the x250's are identical, right? No matter if it's a2001 or 2004 model?No different versions there besides the x250.5?

Maybe some of the members out there know this as well?

Thanks again,
Per Øyvind

kilowattski · 18th April 2005, 06:59 PM

Didn't Mr. Pass just say that there has been no changes in the X250 until the X250.5 came out? Maybe it's just me??

Metric · 18th April 2005, 08:26 PM

Quote:

Originally posted by kilowattski
Didn't Mr. Pass just say that there has been no changes in the X250 until the X250.5 came out? Maybe it's just me??

I'm really sorry Kilowattski. This will not happen again. Thanks for showing me my place.

Nelson Pass · 19th April 2005, 06:16 PM

Well just to clarify, there are parts changes made over the
life of an amp, and we tend to incorporate some improvements
in a product before releasing an updated piece without changing
the topology of the circuit. This makes the product incrementally
better or solves problems, and is often a balm to those customers
having purchased a product before a revision is released.

In the case of the X250, the last year's production had improved
transformers, rectifier bridges, and other minor items, but the
overall performance remain distinctly X250. The 250.5 included
actual topology changes to the circuit and also new handles.

Metric · 19th April 2005, 10:13 PM

Thanks a lot, Mr.Pass. I look forward to hooking up the x250 to my not yet arrived ML's

17th April 2005, 10:19 PM	#1
Metric diyAudio Member Join Date: Mar 2005 Location: Raufoss	Question to Mr. Pass Hi! I am thinking about bying a second hand x250 to use with ML Summit. The panels on these speakers can reach 0.7 ohms. Will this be a problem for the x250? Thanks, Per Øyvind Norway __________________ Pass Labs x600, x1, ML Odyssey, Marantz SA-11S1, Syneristic Research cables

17th April 2005, 10:29 PM	#2
Metric diyAudio Member Join Date: Mar 2005 Location: Raufoss	And one more thing Are the early x250 the same as the latest versions, or have they been opgraded at one time? From serial number xxxxx for instance? Thanks again, Per Øyvind __________________ Pass Labs x600, x1, ML Odyssey, Marantz SA-11S1, Syneristic Research cables

18th April 2005, 06:59 PM	#5
kilowattski diyAudio Member Join Date: Aug 2003 Location: Long Island, New York	Didn't Mr. Pass just say that there has been no changes in the X250 until the X250.5 came out? Maybe it's just me?? __________________ ----------------------------------------------- Kilowattski

19th April 2005, 10:13 PM	#8
Metric diyAudio Member Join Date: Mar 2005 Location: Raufoss	Thanks a lot, Mr.Pass. I look forward to hooking up the x250 to my not yet arrived ML's __________________ Pass Labs x600, x1, ML Odyssey, Marantz SA-11S1, Syneristic Research cables

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18th April 2005, 05:15 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	The X250 has been replaced by an update, the 250.5. It's ability to drive the low impedance of the ML's is about the same. The .7 ohm figure is not a difficulty, as it occurs up about 15 KHz or so, where there is very little actual energy, so we don't see it as a practical problem, as long as an amp is stable into the\ impedance, which the 250 is.

19th April 2005, 06:16 PM	#7
Nelson Pass The one and only Join Date: Mar 2001	Well just to clarify, there are parts changes made over the life of an amp, and we tend to incorporate some improvements in a product before releasing an updated piece without changing the topology of the circuit. This makes the product incrementally better or solves problems, and is often a balm to those customers having purchased a product before a revision is released. In the case of the X250, the last year's production had improved transformers, rectifier bridges, and other minor items, but the overall performance remain distinctly X250. The 250.5 included actual topology changes to the circuit and also new handles.

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