Home > 1-5, 2-way, 20-40lbs, Bass Reflex, Bookshelf/Stand Mounted > BB 2-Way Loudspeakers

BB 2-Way Loudspeakers


A well balanced speaker with a low x-over by Ben Boeshans

The primary design goal of the speaker is all-purpose music speaker for everyday listening.  The speakers require good low-end extension, good clarity, and low fatigue.   The crisp highs were obtained through crossover points calculated to be 900 Hz for the woofer and 1.2 kHz for the tweeter.  The goal was met, as exhibited by the several peer reviews some of which commented, “extremely clear,” very accurate,” and “sounded really clean.”  I really like the sound of plucked guitar played on the speakers.  If one closes their eyes they can believe the guitar is being played in the same room.  Part of that effect is also attributed to the reverberation in the cabinets.  After experimenting with a few different types and amounts of damping materials a balance was found between the openness of the speaker and eliminating resonances.

Design Objectives

  • All-purpose Music Speaker
  • Tight Low-End Response
  • 97dB SPL Max output
  • f3 = 50Hz

Key Features

  • Soft-dome tweeter for mellow yet clear highs.
  • Low crossover point for fast transient response.
  • 2” Port for bass extension.
  • 8” Woofer for solid, defined low-end.
  • MDF/Plywood layered cabinet for reduced resonance.
  • Smooth frequency response 60Hz to 20 kHz.
  • Accurate off-axis response.

Technical Reports

Tests

Tweeter & Woofer Response

Step Response

Minimum Phase Response

Harmonic Distortion

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  1. September 14, 2010 at 10:34 pm

    I guess as a student project this might be regarded as a success.
    I am confused about mixed goal statements which appear to be both test result readings (example: f3 desired result) & descriptive (example: studio monitor, portable).
    Surely the design goal should be clearly stated descriptively, that’s how commerce works & how the world turns.
    State the maximum size, weight, parts cost, finish & desired sonic performance.
    Then complete the project, get independant listener tests to rate according to the design objectives & then you have something worth final evaluation.
    What seems to have been achieved here is that with unknown sourced components, of unknown cost, a very heavy 2 way enclosure has resulted, that requires careful optimised damping “by ear”. The builder claims near studio monitor like performance which seems a bit of a leap of confidence.

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