Three-way Towers (TwT)

Three-way Towers (TwT)


Designer:
Raymund Berlo

Project Category:
Tower Speakers

Project Level:
Intermediate

Project Time:
8-20 Hours

Project Cost:
$500 – $1,000

Project Description:
Three-way towers for bedroom. I like the detail in planar speakers and I’ve used this dome mid before and liked it. Though I should try a combination of the two.

Design Goals:
Tower speakers for music and movies. Good dynamic response and clear detail. Solid bass response down to below 40Hz. Will build a sub later for lower frequencies. The tweeters had to end up a t a specific listening height as the vertical dispersion is limited on these.

Driver Selection:
Dayton Audio DSA270-8 Woofers
Dayton Audio RS52AN-8 Mids
Dayton Audio PT2C-8 Tweeters

Enclosure Design:
Rear slot ported tower tuned to 37Hz

Enclosure Assembly:
.75″ mdf glued
vinyl wrapped
lined with .5″ sound damping foam

Crossover Design:
Dayton Audio XO3W-625/5K
custom series notch filter and L-pad circuit on midrange
100W L-pad attenuator on tweeter

Tips & Tricks:
Cabinet construction was pretty straightforward. Tall tower with rear low port. No separate enclosures were needed for the mid & tweets as they have sealed backs.

Conclusion:
This was the first 3 way setup I’ve done in a long time so I was expecting a little trial and error with tuning. One if the reasons I used an L-pad attenuator on the tweeter.

After initial listening and checking with the RTA I was able to determine this would benefit from a series notch filter on the mid-range as the resonance was less than an octave from the crossover frequency. This made the vocals more balanced and detailed. One day I may just make full custom crossovers for these.

Post woofer break-in these have great detail with music and incredible dynamic range with movies.

About the Designer:
Went to school for audio engineering 25+years ago. Still like to do projects when the opportunity arises.

Project Parts List:

Sonic Barrier 1/2″ Acoustic Sound Damping Foam with PSA 18″ x 24″
Mills 5 Ohm 12W Non-Inductive Resistor
Mills 20 Ohm 12W Non-Inductive Resistor
68uF 100V Electrolytic Non-Polarized Crossover Capacitor
Jantzen Audio 3.3mH 15 AWG P-Core Inductor Crossover Coil
8.2 Ohm 10W Resistor Wire Wound 5% Tolerance
VViViD XPO Wood Grain Textured Dark Wood Premium Film Vinyl Wrap 49″ x 3 ft.
Speaker L-Pad Attenuator 100W Mono 1″ Shaft 8 Ohm
Dayton Audio XO3W-625/5K 3-Way Speaker Crossover 625/5,000 Hz
Parts Express Round Speaker Wire Terminal Cup 2-15/16″ Gold Spring-Loaded
Dayton Audio DSS4-BK Black Speaker Spike Set 4 Pcs.
Dayton Audio DSA270-8 10″ Designer Series Aluminum Cone Woofer
Dayton Audio RS52AN-8 2″ Reference Aluminum Dome Midrange
Dayton Audio PT2C-8 Planar Tweeter

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