Project Category:
Bookshelf Speakers

Project Level:

Project Time:
20+ Hours

Project Cost:
$100 – $500

Project Description:
Stormtroopers, as dubbed by my wife. This was a learning project in terms of design and build.

Design Goals:
Flat response with extended flat bass response and managing to amke the Peerless tweeter work with the Aurum Cantus woofer. Largish bookshelf was the goal with transparency, soundstage, and efficiency.

Driver Selection:
Aurum Cantus 8 ohm 7″ woofer
Peerless Dual concentric 4 ohm tweeter
2″ port with flare

Enclosure Design:
MDF 1.7 L modeled on iOS exclusively
XO is 3rd order butterworth, zobel on both drivers at 8/4 ohms respectively, and attenuation network (Variable L-Pad) on the tweeter. Over engineered the copper wire at 10-12 AWG internally and externally.

Enclosure Assembly:
Surface mount only, time ran out and wanted it done. Flush mount on future builds.

Crossover Design:
3rd order buttersworth, zobel on both drivers, L-Pad on tweeters

There is better than anticipated off axis response, high efficiency, clean soundstage, transparency with DAC supplied music, warm lovely vinyl music, very good background music experience, some challenges with near off axis and port leakage, latter now resolved with stuffing.

About the Designer:
Just a geek in all things that interest me.

Project Parts List:

Peerless by Tymphany XT25TG30-04 1″ Dual Ring Radiator Tweeter
Aurum Cantus AC-180F1 7″ Woofer
Solen 9.1uF 400V Poylpropylene Capacitor
Solen 27uF 400V Polypropylene Capacitor
ERSE 0.15mH 18 AWG Perfect Layer Inductor Crossover Coil
ERSE 0.60mH 18 AWG Perfect Layer Inductor Crossover Coil
ERSE 0.20mH 18 AWG Perfect Layer Inductor Crossover Coil
Blue Perforated Large Hole Crossover Board Pair 5″ x 7″
Precision Port 2″ Flared Speaker Cabinet Port Tube Kit
Jantzen Audio 0.68uF 800V Z-Superior Capacitor
Solen 7.5uF 400V Polypropylene Capacitor
Mills 8 Ohm 12W Non-Inductive Resistor
Mills 4 Ohm 12W Non-Inductive Resistor

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