Revised MBOW1 3-Way

Revised Crossover for the Best Buy Insignia

Revised Crossover for the BR-1 Kit

Mod for Morel 403.5 3-Way


Revised Crossover for the Norh 9.0 Marble

The New Vifa Tower

Fixing the Polk RTi28

The MB20

The MB27

The Plop-in-the-Box

The Usher Two-Way

Revised Crossover for the Radio Shack LX550

Alternative Crossover for the Dynaudio Gemini

Crossover for the Revelator-RT1 Mini Monitor

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The Acoustic Research AR4x

A Tale of Two Cabinets

Tweeter Comparison

The RadioShack Minimus 7

JMLab Mezzo Utopia,
Tannoy Westminster,

Measurements for the Radio Shack LX550

Proac Super Tablette

Acoustic Research AR3a

Sound Dynamics RTS-3

Stock vs Modified Gemini

NHT Super One

Measurements for the Radio Shack LX550

Here is the on-axis response for the Radio Shack LX550 loudspeaker, which combines a 5" kevlar woofer with the Linaeum dipole tweeter.  The lack of output above 9 kHz is due to an on-axis null in the radiation pattern of the tweeter.  In addition, the very short tone burst measurement method used does not capture the full contribution of the tweeter's back wave.  Still -- the LX550 definitely lacks sparkle when listened to on-axis.

Here is the response 30 degrees off axis.  The highs are back up to reference level, but a null develops lower down.

This Project suggests modification to the crossover (well -- a whole new crossover) that provides a more extended, detailed sound.  Interestingly, the revised crossover measures very similarly on axis to the stock unit.  The improvement comes from getting the woofer out of the way of the tweeter and allowing most of the output above 3 kHz to come from the superior tweeter.