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Category Archives: Speaker / Room Correction

Five reasons to love DEQX’s new PreMATE processor

The PreMATE is DEQX’s newest speaker / room correction processor and digital crossover. It offers: Speaker correction – measure and correct the frequency response, group delay and phase anomalies of your loudspeakers using DEQX’s unique linear phase filters Room correction – measure your room and implement up to 10 bands of real time controllable digital […]

Acoustic Frontiers White Papers and Articles

“The true sign of intelligence is not knowledge but imagination.”— Albert Einstein   We at Acoustic Frontiers do not stop at “the basic” industry certifications and qualifications. In acoustics in particular we continue to drive industry thought leadership as demonstrated by the articles and white papers we publish. Acoustical Measurement Standards for Stereo Listening Rooms […]

Audyssey XT32 vs. Parametric EQ: A Comparison of Manual vs Automagic Calibrations

Setting the Stage for Battle! Earlier this year Acoustic Frontiers had the opportunity to improve a two channel and home theater system in Tucson, Arizona.  Our client owned a Polk / Onkyo system which incorporated the latest Audyssey XT32 ‘room correction’ algorithms. However he was unhappy with overall sound quality and wanted to know how […]

Hard proof that equalization kills room modes

In recent years there has been much debate about how effective equalization is in reducing the negative impact of room modes. Room modes are characterized by a peak in the frequency response and extended ringing in the time domain. They create low frequency coloration and lack of articulation and are perhaps one of the most prevalent acoustical problems, since they exist in all small rooms. This article provides measured evidence of the efficacy of equalization in reducing both the peak and ringing associated with room modes.

Impulse Response measurement showing reduction in ringing from EQ

Two channel amplifiers with bass management and room correction!

Recently I have become aware of a new class of product: two channel amplifiers WITH bass management AND room correction. Why is this cool? Well until this new class of products came out the only way to do this type of thing was with a home theater receiver or a separate preamplifier such as a DEQX or TacT and a power amplifier. Two channel systems benefit just as much from subwoofers and equalization as home theater systems. Many two channel speakers, even high end ones, cannot reproduce low bass below say 30-40Hz with low distortion. A JL Audio F112 can play down to 19Hz at a -3dB point! Using subwoofers also allows for cunning room mode cancellation and avoidance of speaker boundary interference.

Classe CP-800

A survey of Room Correction devices – Meridian, TacT, Lyngdorf

In the next couple of articles I’m going to create a comprehensive directory of the room correction products available on the market and assess them against the functional criteria that have been explained in the last two articles (here and here). Today I’m covering Meridian (the 861 and G68 surround processors), TacT (including the 2.2XP) and Lyngdorf. Future articles will examine Audyssey, Velodyne and DSPeaker.