equipment reviews
This Month's Featured Equipment Reviews
Merrill Audio THOR Mono Block Amplifiers Review
Plinius Hautonga Integrated Amplifier Review
KEF R700 Loudspeaker Review
Marantz SA-14S1 SACD Player & DSD DAC Review
Genesis G7c Loudspeakers
Latest AV News
Power Amplifier Forum Topics:
Classic Power Amplifier Reviews
Past Power Amplifier News
 
Pass Laboratories X150.5 Stereo Power Amplifier  Print E-mail
Home Theater Power Amplifiers Stereo Amplifiers
Written by Christopher Zell, Ph.D.   
Saturday, 01 November 2003
Article Index
Pass Laboratories X150.5 Stereo Power Amplifier 
Page 2
Page 3

The Downside
As previously discussed, while I have no major complaints with the impressive sonic performance of the Pass Laboratories X150.5, I do have an issue with the loudspeaker binding posts on the review sample. They seemed out of place in quality when compared with the rest of the X150.5. An amplifier in this price range ought to have much better posts that are more versatile and robust. Not only would they not accept any kind of banana plug, they would not easily handle any large-diameter loudspeaker cables. One other minor item is that that the amplifier does run quite hot, which the buyer should be aware of when thinking about amplifier placement, as well as room issues such as ventilation and cooling. This is more of a warning than a criticism, one inherent in any amplifier with high idling bias currents in the output stage.

Conclusion
Despite the fact that there are plenty of more expensive amplifiers out there, most folks, myself included, would consider $4,500 a healthy chunk of change for a stereo power amplifier. A product at this price point had better deliver on all fronts, and with the exception of the binding posts, the X150.5 certainly does to both my ears and eyes. The Pass Laboratories X150.5’s stunning and tasteful cosmetics, combined with powerful, dynamic yet non-fatiguing sonics, make it a real winner. I am always wary of characterizing the sonic attributes of an amplifier using terms such as “soft,” “etched,” etc. since the effect depends so much on surrounding components and source material. Comparisons without matched level testing in the same room and with the same system are also extremely dangerous, as normally the conclusions are wrong or at best exaggerated. Still, I’ll do my best here to characterize my impressions of the X150.5. I doubt anyone would ever call this amp forgiving, euphonic and lush, or the bottom end rich and fat. The X150.5 consistently sounded very live and dynamic, partially because of what I perceived as a very low noise floor. The highs were very clean and extended and sounds such as high hats in particular were very impressive through the Pass Laboratories amp. The lowest octaves seemed a tad lean at times, which is again neither good nor bad, and the bass was liquid and tight, not bloated, while still powerful when called for. The X150.5 was very revealing and detailed, so that bad recordings were thrown right back at me, but without any extra sizzle to render them unlistenable, just revealing the ugliness that was already there. I noticed that vocals seemed a bit further back or very slightly recessed when compared with a few other top amplifiers. This is not a criticism, or a statement that the X150.5 was not accurate, just something that struck me over time. The X150.5 is an excellent amplifier that I will be sorry to see leave my sound system. And remember, if you wonder in the back of your mind if your loudspeakers are too inefficient, or your room too big, don’t forget that this is the baby in the X line. I can confidently recommend simply moving up the Pass Laboratories X series line to one of the X150.5’s more powerful siblings.
Manufacturer Pass Laboratories
Model X150.5 Stereo Power Amplifier
Reviewer Christopher Zell, Ph.D.





Like this article? Bookmark and share with any of the sites below.
Digg!Reddit!Del.icio.us!Google!StumbleUpon!Yahoo!Free social bookmarking plugins and extensions for Joomla! websites!


 

 
  home theater news  |  equipment reviews 
  blu-ray reviews  |  dvd  |  theatrical reviews  
  music download reviews  |  music disc reviews
  contact  |  about-us  |  careers   |  brands 
  Subscribe to Us   |   RSS   |  AVRev Forums
  front page  |  virtual tours  |  dealer locator
  how to features  |   lifestyle & design articles
  Want Your Home Theater Featured on MHT?
   CE Partners: HDD  |  HDF  |  VGT  |  SD  |  DVD
   
  Click Here to Advertise with Us | Specs
  Sponsors | privacy policy | terms of use
  909 N. Sepulveda Blvd. El Segundo, CA 90245
  Ads: 310.280.4476 | Contact Us
  Content: 310.280.4575 | Mike Flacy