Originally Posted by cel4145
I had hoped there would be a little more transparency with the new company. The frequency response for the 18" passive sub is not listed, even though their specs indicate that CEA 2010 measurements are being given for SPL output.
Frequency response specifications are a meaningful tool for the informed consumer to use to evaluate a loudspeaker. I'm happy to address this question and to add information that will help others assess Chane bass systems.
The passive Chane subwoofers mentioned - like virtually all low frequency systems under the size of a small refrigerator - require equalization. Woofers in commonly-sized boxes are nearly always incapable of natively reaching very low F3 numbers and so are typically heavily equalized.
This equalization is generally part of the input circuit in onboard subwoofer amplifiers and is generally fixed.
As the Chane subs mentioned are indeed passive, they include neither onboard amplification or such equalization. They are subject to any number of setup variables which will influence their simple frequency response specifications.
Chane intends this as part of the product specification and philosophy, and we further extend it to the consumer as a feature. We write about this in the product descriptions, and amplifiers we offer may even include such equalization.
The most sophisticated, flexible, and user and room-responsive bass equalization for the money today, however, may be that found in common measure-and-set routines in receivers and amplifiers for the general consumer market. These user-operated routines perform high quality equalization to within an acceptably narrow window and they are easily more advanced than fixed one-curve onboard equalization in a typical powered subwoofer.
Once one of these common systems is run and its equalization curve applied, with sufficient power the Chane subwoofer is suitable to then achieve the numbers we've listed using the CEA standard. These figures are important because they reflect the subwoofer's response profile at maximum level and not just at small signal level.
Obviously, the user may also tune a system to taste by manually altering outboard bass equalization, a feature not found in all-in-one self-powered subwoofers with fixed frequency responses. This added dimension can be an important consideration.
In this way the Chane specification offers a better way to gauge real avaliable output, while the subwoofer itself offers a superior curve fit to the room the bass system is used in. The user gains added user setup flexibility, and is provided a more available and informative perspective on available real bass performance.
Stating a fixed, small-signal frequency response would require locking in just one equalization standard when we wish to promote the user employing any competent equalization method while retaining the flexibility of also tuning to taste.