Tercet Towers

Tercet Towers


Designer:
Jim O

Project Category:
Tower Speakers

Project Level:
Intermediate

Project Time:
20+ Hours

Project Cost:
$500 – $1,000

Project Description:
Audiophile floor towers.

Design Goals:
To design and build a 3 way tower system using a 1st order crossover design with high power capabilities. To be driven with a stereo pre-amp and a 125 watt per channel amp. No EQ running totally flat.

Driver Selection:
(2)ea.
275-131 Dayton Audio RST28A-4 1-1/8″ Reference Series Aluminum Dome Tweeter 4 Ohm

295-528 Dayton Audio DSA175-8 6-1/2″ Designer Series Aluminum Cone Woofer

295-357 Dayton Audio RS270-8 10″ Reference Woofer

Enclosure Design:
3 separate cabinets stacked to make a tower using bass reflex designs that are angled to help improve time alignment and audio focus.

Enclosure Assembly:
Poplar fronts, tops and bottoms. MDF sides and backs, webs and gussets. I made 3D models for several of the parts and a friend printed them for me on his 3D printer.

Crossover Design:
1st order crossover with zobel network on the mid bass. As well as a frequency overlap between the bass and mid bass drivers. This was done using XSIM.

Tips & Tricks:
The fronts, tops and bottoms are stained with Barn Red polyurethane stain with a polyurethane clear coat. The sides and back have flat black exterior latex using a roller to apply.

Conclusion:
This requires 3D printed parts to complete as shown. I have the STL files I created for printing the plastic parts, but they exceed the 1.5 meg file limit here.

About the Designer:
I am a retired aircraft composite tool builder and now an amateur speaker designer/builder for my home stereos. I’m still learning (hopefully).

Project Parts List:

Dayton Audio RST28A-4 1-1/8″ Reference Series Aluminum Dome Tweeter 4 Ohm
Dayton Audio DSA175-8 6-1/2″ Designer Series Aluminum Cone Woofer
Dayton Audio RS270-8 10″ Reference Woofer
ERSE 2.5mH 18 AWG Perfect Layer Inductor Crossover Coil
Jantzen Audio 0.25mH 15 AWG Air Core Inductor Crossover Coil
Dayton Audio DMPC-8.2 8.2uF 250V Polypropylene Capacitor
Audyn Cap Q4 82uF 400V MKP Metalized Polypropylene Foil Crossover Capacitor
Jantzen Audio 33.00 Ohm 10 Watt Audio-Grade Superes Resistor
Mills 7 Ohm 12W Non-Inductive Resistor
Solen 16uF 400V Polypropylene Capacitor
Parts Express Recessed Binding Post Banana Jack 5-Way Speaker Wire Terminal
4″ ABS tubing for bottom firing ports on the lower cabinets
Polyfill

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