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SIERRA-2EX:       THE NEW BENCHMARK...

Sierra-2EX Piano Black


Our New Benchmark Bookshelf Loudspeaker, Featuring a Custom RAAL True Ribbon Tweeter Combined with our new Proprietary 6" SEAS EXCEL Curv™ Woofer and our Remarkable Low Resonance Layered Bamboo Cabinet.

With the development of this shockingly high-performance new woofer, we have improved upon every aspect of our award winning Sierra-2. Truly stunning bass extension and midbass punch, mids are cleaner - smoother and more detailed, improved dynamics and better composure at higher volume levels.

With over 1.5 years in development and taking full advantage of the best transducer engineers in the business, we are excited to once again set a new performance standard. High-End tower-like speaker performance in a compact beautiful bookshelf-sized speaker.


The Sierra-2EX improves upon every performance aspect of the Sierra-2 and the measurements are outstanding! This is a true benchmark product and thanks to the feedback and inquiries from all of you – we fully committed ourselves to making it happen and we could not be any more pleased with the results.


arrow 30-day satisfaction guarantee arrow 7-year warranty arrow Assembled & Tested in the USA

20th Anniversary Sale Introductory Pricing!

Standard cabinet finish options and pricing:

Natural: $1648 $1498 /pair $838 /center
Satin Espresso: $1648 $1498 /pair $838 /center
Satin Dark Cherry: $1648 $1498 /pair $838 /center
Piano Black: $1698 $1498 /pair $858 /center

Please use the following links for ordering:

Standard Sierra-2EX pair Standard Sierra-2EX center

Domestic cabinet* finish options and pricing:

Natural: $1748 $878 /center
Satin Espresso: $1748 $878 /center
Satin Dark Cherry: $1748 $878 /center
Satin Black Bamboo: $1748 $878 /center
Black Matte: $1698 $858 /center

* Domestic cabinets match our Sierra Towers, Horizons and Lunas' featuring cabinets proudly Made-in-the-USA!

$36 flat rate shipping per pair to continental US addresses

$20 flat rate shipping per center to continental US addresses

Please use the following links for ordering:

Domestic Sierra-2EX pair Domestic Sierra-2EX center

Upgrade Kits:

Sierra-1 to Sierra-2EX Sierra-2 to Sierra-2EX
Sierra-2EX Domestic Satin Espresso


A little over 3-years ago we were privileged to be introduced by SEAS to a new super high end diamond tweeter they developed called the White Diamond. We were extremely impressed and immediately requested that SEAS build us up a matching cost-no-object woofer based on specific parameters to meet our performance goals.

About a year later and after many samples, we had our new woofer and we started building and selling custom Sierra Diamond speakers. These custom Sierra Diamond speakers start at $7500/pair, thus limiting their affordability.

The performance of the Sierra Diamond is astonishing, but customers as well as those who auditioned this speaker noted that as impressed as they were with the diamond tweeter, the woofer was equally impressive. We fully agreed. The midbass punch, bass extension, midrange detail, frequency response linearity, and overall dynamics was the best we had ever come across in a woofer this size, and even compared to many larger woofers.

Our own customers started to inquire about using this woofer in many of our designs, including our most successful speaker to date, our award winning Sierra-2. Problem was, being a true custom build - each of these woofers was being hand made for us by SEAS’s engineering team. These had never been mass produced and then there was the issue of cost.

Our EX woofer is part of SEAS’s Excel line, using an optimized version of the venerable W16 motor system – customized to best match a new specially treated Curv woofer cone. Retail pricing on W16 woofers is typically in the range of $280 and up. Our EX woofer is a purely custom build compared to the stock W16, thus retail pricing is even higher.

This is all detailed on our forum in this thread: Diamond Tweeter

As a company, we have always tried to give our customers and fans what they ask for – this is a major advantage of selling direct – we get to communicate directly with all of our customers. Upon witnessing the massive amount of interest in a Sierra-2 with this woofer, we became fully committed to make it happen. SEAS went to work on optimizing manufacturing processes and parts procurement – while we committed to purchasing a large enough supply to make it beneficial for both SEAS and Ascend, and get the per unit pricing down to a point to make it affordable, a true win-win.

This new woofer brings a few things to the table...

The Excel motor systems are known for having extremely low inductance; this woofer has less than half the inductance of the standard S2 woofer, which is already low. This combined with a significant reduction in moving mass, 22% lower to be exact, and a more powerful magnet system provides exceptionally deep bass and much improved transients and dynamics.

This woofer hits hard - there is more punch and bass extends lower than much larger woofers. Even with an 80Hz crossover, listeners will sense the greater impact due to the enhanced midbass.

The extremely low inductance combined with a new damping treatment being used on the Curv cone provides improved self-damping (which is already superb with the S2 woofer and why we chose the Curv cone in the first place) and greater high frequency extension and detail.

The huge copper phase plug improves off-axis dispersion, greatly reduces any beaming, works in conjunction with the pure copper upper and lower Faraday rings to reduce distortion, linearize magnetic flux and improve power handling and thermal compression by acting as a massive heat sink.

In simpler terms, mids are cleaner - smoother sounding with more weight to them (they sound warmer, fuller with more detail). Because of the upper end improvements, we can use a steeper high pass filter slope on the tweeter, easing the workload on the ribbon tweeter which in turn increases power handling, lowers distortion and provides for an even better overall blend between the woofer and tweeter.

The Sierra-2EX sounds like our Sierra-2, but is warmer/fuller, cleaner (especially at louder volume levels), more musical and with rather shocking dynamics. And, if run full range - the bass response seems to defy the laws of physics -- it is tower-like. In direct A/B comparisons with speakers using very high quality larger woofers, the EX woofer hit harder and deeper.

The Sierra-2EX woofer features:
  • long-throw design for high power handling and extended bass
  • radially reinforced surround reduces surround resonances at higher excursions and provides for better overall damping
  • SEAS’s exclusive SpiderRing® technology improves suspension alignment for higher long term reliability, improved power handling and improved mechanical linearity
  • custom cast magnesium frame for a stiffer and lighter basket frame allowing for less material behind the woofer cone reducing back-wave reflections for enhanced detail, better airflow and less cavity resonance
  • vented pole-piece and open spider for enhanced air-flow and cooling, minimizing compression artifacts
  • exclusive Curv (woven polypropylene) cone featuring a newly developed damping treatment for exceptional self-damping
  • pure copper upper and lower Faraday rings to reduce distortion, linearize magnetic flux, and dramatically reduce inductance
  • massive pure copper phase plug improves off-axis dispersion, greatly reduces any beaming, improves power handling and thermal compression by acting as a massive heat sink, and enhances the functions of the upper and lower Faraday rings
  • 22% lower moving mass than the Sierra-2 woofer, and less than half the inductance

The Sierra-2EX improves upon every performance aspect of the Sierra-2 and the measurements are outstanding! This is a true benchmark product and thanks to the feedback and inquiries from all of you – we fully committed ourselves to making it happen and we could not be any more pleased with the results.

Hand assembled, tested and packaged in the USA, we are so confident of the component and build quality of the Sierra-2EX that we are backing it by a comprehensive 7 year parts & labor warranty.  Left / right pairs are matched by hand to within ± 1dB and we are including a printout of the actual production line response measurements of each speaker.  We dare say it, but you simply can not find this type of quality control, care and pride from products that are fully assembled and tested in overseas manufacturing facilities.

We thank you for your interest!