Project Category:
Tower Speakers

Project Level:

Project Time:
8-20 Hours

Project Cost:
$100 – $500

Project Description:
This is a hybrid design of the PLUTO loudspeaker. This an experimental design using a passive crossover with some design features of the Pluto. This is not intended to be a Pluto clone.

Design Goals:
To minimize speaker box resonance. To preserve the “point source” feature of the Pluto design. To design a passive crossover using Jeff Bagby’s “Passive Crossover Designer”.

Driver Selection:
264-1146 Tymphany SDS 160F25PR01-08 6-1/2″ Woofer

296-252 AuraSound NSW2-326-8AT 2″ Extended Range Speaker

Enclosure Design:
Closed box (tube) stuffed pipe design to minimize speaker box resonance. The unique feature of this design is the woofer is placed at a 45 degree angle. To my ears, the woofer integrates better with the tweeter compared to an upward firing woofer. My woodworking skills are at a beginner level, so I wanted to keep the enclosure design simple.

Crossover Design:
I wanted a second order Linkwitz-Riley design. After experimenting, I ended up with something close to a second order design for 7 ohms at 1400 hz.

Tips & Tricks:
After a little experience is gained; trust you ears before any graphs or theories.

I am really pleased with this project. Both speaker drivers sound better than I expected. The “point source” aspect of the design gives these speakers an imaging quality that is not in a regular box design. Minimizing speaker box resonance gives a cleaner sound to the speakers. I play these with a subwoofer which fills out the bass. When listening to the radio, they are fine without the sub. I would recommend this to anyone wanting to experiment with speaker designs. I would be very interested if someone with more experience and a better ear made improvements to this design. With less than $60.00 for speakers and an economy crossover; this is a low cost, high value design.

About the Designer:
I am retired and enjoy experimenting. I enjoy reading and researching in the diy community. I am at the beginner level of speaker building and feel ready to bring some projects to completion.

Project Parts List:

Dayton Audio DMPC-8.2 8.2uF 250V Polypropylene Capacitor
8.0uF 100V Electrolytic Non-Polarized Crossover Capacitor
47uF 100V Electrolytic Non-Polarized Crossover Capacitor
Dayton Audio 1.5mH 18 AWG I Core Inductor Crossover Coil
Dayton Audio DNR-2.0 2 Ohm 10W Precision Audio Grade Resistor
Dayton Audio DNR-12.5 12.5 Ohm 10W Precision Audio Grade Resistor
Peerless by Tymphany SDS-160F25PR01-08 6-1/2″ Paper Cone Woofer Speaker
AuraSound NSW2-326-8AT Whisper 2″ Extended Range Speaker Driver 8 Ohm

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