By using a single ended class A power amplifier which has a highish output impedance. We take advantage of the fact the the impedance of the speaker (because of inductance) increases at HF and so the voltage drop at the amplifier's terminals is reduced.
Or using an inductor in series with a resistor?
Or an L in series with C circuit to reduce mid content?
Sensitivity decreases but the speaker could become much more great. Paper cones have the advantage of natural sound.
How would such an arrangement sound with the Pleiades 1 transistor power amplifier?
Or just one electron tube Pleiades power amplifier, eg EF183.
Examples of bass equalized speakers are Beolit mono radios, JVC 9425W portable mono cassette radios etc.
Can this principle be used together with HF extension.
The objective is making the sound correct to listener's brain.
Taking into account the lower SPL of a low power amp but of great quality and smoothness such as class A amplifiers.
Another way of increasing treble is by generation of secondary overtones etc by such amplifiers when they are generously driven. They do that softly not abruptly as they do not employ negative feedback.
While making the EQ, one could use the Alan Parsons test CD on warbled tones and an SPL meter.
Reference:
Flat frequency responce from singer's vocal chords to listener's brain - Loye, Morgan - Journal of Motion Pictures Sound Engineers
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