Axiom Home Page Forums General Discussion Home Theater Avia Disc & Sub-Woofer Calibration...

Just look at the M80 graph... It's -6db at 40hz from 100Hz.

+/-3db means it can be 6db off the peak... which it is.

Sorry to multiple post...

And, the EP500 is almost flat as a board down to 20 Hz (and 10db higher to start with, which can be attenuated with the gain knob). That's why you need a sub to extend to the low frequencies.

The +/- 3db does mean it can be off either +3db or - 3db which is a 6db swing but not down 6db at 34hz.

It can mean -6db off the high point, wherever that point is.

Hey, here's the graph, you tell me your interpretation.

http://www.axiomaudio.com/gallery_m80ti_diagram.html

The graph does not lie nor does Steve. Many manufacturers quote their specs this way.

A quote from Alan's article.

A simple claim of frequency response that cites two frequency extremes unqualified by a dB specification (e.g., frequency response: 34 Hz - 22 kHz) is meaningless and useless. It may mean that although the speaker responds at 34 Hz--the cone moves a bit, perhaps--nothing will be audible because the speaker's response at 34 Hz is at -30 dB and inaudible! On the other hand, if Axiom states that the M80’s frequency response is 34 Hz - 22 kHz +/-3 dB, this indicates that every tone that emerges from the M80 will be within 3 dB of any other over that entire frequency range.

Alans article

Well, that is either misquoted, or untrue, or both. The tolerance is +/-3db, not +/-1.5db. To be +/-3b is a 6db swing. Axiom's graph shows the evidence.

As Steve comments, if a speaker was 6dB down from a high point at a particular frequency, that frequency would still fall within a +/- 3dB spec, which encompasses a 6dB "window".