PoweredForce Forward bass technology combines two MartinLogan audio
innovations: PoweredForce, which allows small enclosures to accurately
produce massive amounts of bass, and ForceForward, which significantly
reduces performance-robbing front-wall bass reflections.
PoweredForce Forward bass technology uses an advanced crossover
topology with phase-timed woofers to minimize destructive reflected
energy. By virtually eliminating front-wall bass reflections and working
in tandem with the panel, PoweredForce Forward Bass Technology gives
you more placement flexibility, and enhances the true audio realism of
your sound source.
Turning Unused Space Into Better Bass
The depth of Masterpiece Series speaker cabinets was carefully chosen to maximize benefits of both PoweredForce and ForceForward technologies, providing powerful bass with extreme detail. Combined with Anthem Room Correction (ARC™), these advanced bass technologies provide a level of low-frequency precision that is truly unique.
Masterpiece Series speaker cabinet dimensions create an ideal
relationship between the woofers, cabinet volume, and amplifiers in
their PoweredForce woofer systems. By providing ample internal
volume for the woofers (two sealed enclosures—one per woofer) along with
powerful amplification, Masterpiece Series speakers with powered woofer
systems are capable of reaching the lowest registers with authority
while preserving bass detail.
With ForceForward bass technology, the farther apart the
woofers are from each other the lower in frequency its beneficial
effects extend. MartinLogan’s ForceForward technology has
solved a problem (found in nearly all speakers) where low bass frequency
soundwaves reflect off the wall behind the speakers and interact with
the waves traveling towards the listener. These interactions create
non-linearity in those frequencies as they arrive at your ears and bass
information suffers from both cancelations and excessiveness that is not
accurate to the original sound. By selectively adjusting phasing of
output from their opposing woofers, powered Masterpiece Series speakers
eliminate problematic bass energy from behind the speakers.
ForceForward also simplifies the task of speaker placement
by removing bass energy from behind the speaker and creating a uniform
bass launch. This allows Masterpiece Series speaker cabinets to go
closer to the wall than previous generations of MartinLogan speakers. As
a rule of thumb we recommend placing the rear of the speaker cabinet no
closer to the wall than the diameter of its woofer (Renaissance ESL
15A: 12-inches, Expression ESL 13A: 10-inches, and Impression ESL 11A
and Classic ESL 9: 8-inches). For an added level of control powered
Masterpiece Series speakers incorporate two level controls (at 75Hz and
200Hz) to allow for fine tuning of bass integration.
Additionally, due to their dipole nature, electrostatic panels
perform best when placed at least 2.5-feet or more from the wall—a
distance that is ideal for the front of nearly any high-end speaker,
regardless of driver technology. The depth of Masterpiece Series
cabinets lends itself to providing electrostatic panels with adequate
distance from the wall, guaranteeing a richly detailed,
Precision-Built Advanced-Topology Vojtko Crossover
Vojtko voiced, the advanced crossover and electronics in Impression
ESL 11A add mid-range clarity to this artful composition. Carefully
hand-built using only the finest polypropylene capacitors and air-core
coils, the crossover employs MartinLogan’s proprietary Vojtko topology
for vanishingly low distortion and seamless driver/ESL integration. This
precision-tuned network preserves even the most microscopic sonic
nuances while handling the full dynamics of any source.
We’ve also considered the signal you will feed your loudspeakers and
have engineered Impression ESL 11A to work well with practically any
type of electronics. MartinLogan’s state-of-the-art toroidal transformer
and electrical interface engineering ensure an absolutely transparent
link from amplifier to electrostatic panel and woofer array. This
produces sound of unparalleled purity, precision, clarity, and openness —
the next best thing to no speaker at all.