FROY Mk3

DESIGNER:  
183
PUBLISHED: 
183
Enclosure Type: Bass Reflex
Driver Alignment: 2-way, D'Appolito
Tweeter Type: Dome
Bass Type: Woofer
Crossover Type: Passive
Impedance: 4 Ohm
Sensitivity: 87 dB
Cutoff -3 dB: 45 Hz
Diaphragm Material: Silk, Magnesium
Build Complexity: Novice
Radiation Type: Monopole
Type of Use: Home
Placement: Standmount
Bass Driver Size: 5.5 inch
Cost of Parts: $1750

DRIVERS:

SEAS Excel drives in a D'Appolito configuration

TABLE OF CONTENTS

Overview

The FROY Mk3 is a new and improved version of the original FROY design; utilizing the latest drive unit technologies from the Excel product line. This kit uses two W15CY001 woofers and a single T25CF002 "MILLENNIUM" tweeter mounted in a D'Appolito configuration.

The cabinet is a bass reflex design with the vent placed in the rear. This directs any potential vent noises away from the listener, and allows for minimum baffle area in the front. The port tube is constructed of two MDF boards which also serve as additional bracing for the cabinet.

The crossover network is conventional except for a parallel circuit which suppresses the response peak due to the magnesium cone. The crossover frequency is 2.2kHz.

The FROY Mk3 was designed by Murray Zeligman, who also designed the original FROY kit.

He offers the following comments regarding the FROY MK3:

"This system has the ability to discern the subtlest of musical information, and at the same time give an impression of bass that is far deeper and extended than one could even imagine"

AUTHOR:
In the late 1920s, at the Norwegian Institute of Technology (NTH), the first Norwegian electrodynamic loudspeaker drivers were designed. Ever since, Norwegian engineers have been leading the technology race in driver design.
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