GDX2


GDX2

Overview

This 2-way desktop/bookshelf stereo pair was designed to be used for general music listening, as well as mixing.  With a ported cabinet, this system has an F3 of around 80 Hz, giving a good representation of bass frequencies without necessarily needing a subwoofer, though one can be used for added fullness.  Designed on a budget, this pair cost just under $500, giving high performance at a relatively low cost.

Goals:

  • Small size for desktop use, as well as portability.
  • Low frequency extension.
  • Flat frequency response.
  • Budget of $500.

Features:

  • 2-way system.
  • Passive crossovers.
  • Ported cabinet for low frequency extension.
  • Flat response curve (variation of 1.5 dB.)

Cabinet:

  • 3/4″ 11-ply birch exterior.
  • 1/2″ MDF interior.

Drivers:

  • SEAS Prestige h1141 5.5″ aluminum cone woofer.
  • SEAS Prestige h1211 1″ textile dome tweeter.

Documentation:

Initial Design Statement

Drafting Packet

Final Testing Report

Speaker Glossy

Testing Results:

Overall

Frequency Response

Green: Overall. Blue: Woofer. Yellow: Tweeter. Purple: Port

Frequency Response Curve

Reverse Polarity

Inverted Polarity on Tweeter

Crossover Filter Response

Crossover Filter Response

Horizontal Off-Axis

Green: 15 degrees. Blue: 30 degrees. Yellow: 45 degrees. Purple: 60 degrees.

Horizontal Off-Axis Response

Vertical Off-Axis Response

Red: 15 degrees. Green: 30 degrees. Blue: 45 degrees. Yellow: 60 degrees.

Vertical Off-Axis Response

Step Response

Step Response

Impulse Response

Impulse Response


Waterfall Plot

Minimum Phase Plot

Harmonic DistortionHarmonic Distortion

Tweeter

Tweeter Frequency Response

Frequency Response

Tweeter Horizontal Off-Axis Response

Purple: 15 degrees. Red: 30 degrees. Green: 45 degrees. Blue: 60 degrees.

Horizontal Off-Axis

Tweeter Vertical Off-Axis

Blue: 15 degrees. Green: 30 Degrees. Red: 45 degrees. Purple: 60 degrees.

Vertical Off-Axis Response

Tweeter Left/Right Difference

Step Response

Impulse Response

Green: Tweeter. Purple: 6 Ohm Resistor.

Tweeter Impedance

Harmonic Distorion

Woofer

Woofer Frequency

Woofer Frequency Response

Purple: 15 degrees. Red: 30 degrees. Blue: 45 degrees. Green: 60 degrees.

Horizontal Off-Axis Response

Blue: 15 degrees. Red: 30 degrees. Purple: 45 degrees. Yellow: 60 degrees.

Vertical Off-Axis Response

Woofer Left/Right Difference

Step Response

Impulse Response

Yellow: Woofer. Blue: 8 Ohm Resistor.

Woofer Impedance

Harmonic Distortion

Creative Commons License
GDX2 by Grant Prusi is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.

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