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

The Acoustic Research AR3a

I recently restored a pair of the classic Acoustic Research AR3a speakers, circa 1970.  The deep bass is still very impressive, but by modern standards, the crossover is pretty primitive, and that, together with the ad hoc driver placement resulted in severe cancellation modes in the mid-highs.  The woofer also had a big hump at the top of its range, which colored the sound.  Still, it sounds better than you might think.

Here are the measurements: