L-Notes

L-Notes


Designer:
Lou H.

Project Category:
Bookshelf Speakers

Project Level:
Intermediate

Project Time:
8-20 Hours

Project Cost:
Under $100

Project Description:
Its a bass reflex MTM bookshelf speaker. It utilizes two four inch woofers and a small dome tweeter.

Design Goals:
I designed these speakers in my high school Advanced Audio Systems course, with the help of my teacher Mr. Grant Gustavsen. as a replacement to the sold out C-Notes. They needed to be around $100 and have a similar size and performance.

Driver Selection:
Dayton Audio TCP115-4 4″ Treated Paper Cone Midbass Woofer 4 Ohm – 295-415

Dayton Audio ND20FB-4 Rear-Mount 3/4″ Soft Dome Neodymium Tweeter – 275-035

Enclosure Design:
It is a bass reflex box with .2ft^3 volume and is tuned to 76 Hz.

Enclosure Assembly:
Particle board construction capped in poplar for aesthetic value. I sectioned off the bottom to make them taller and keep the internal volume constant.

Crossover Design:
The crossover is a two-way third-order Butterworth with a Zobel on the woofer.

Tips & Tricks:
Have Fun!!

Conclusion:
A couple of kids in my class built the C-Note kits, and I feel like these met or even exceeded their performance. I think that these are great speakers to build on a budget.

About the Designer:
I’m a high school student who took tech class for the fun of it and my teacher Grant Gustavsen introduced me to the wide world of speaker designing. Through this I found a passion for sound quality and music appreciation.
Project Parts List:

Dayton Audio TCP115-4 4″ Treated Paper Cone Midbass Woofer 4 Ohm
Dayton Audio ND20FB-4 Rear-Mount 3/4″ Soft Dome Neodymium Tweeter
Dayton Audio 0.20mH 18 AWG Perfect Layer Inductor Crossover Coil
Dayton Audio DNR-6.0 6 Ohm 10W Precision Audio Grade Resistor
Dayton Audio DNR-3.0 3 Ohm 10W Precision Audio Grade Resistor
Dayton Audio 0.13mH 18 AWG Perfect Layer Inductor Crossover Coil
Dayton Audio 0.60mH 20 AWG Air Core Inductor Crossover Coil
4.7uF 100V Electrolytic Non-Polarized Crossover Capacitor
22uF 100V Electrolytic Non-Polarized Crossover Capacitor
8.0uF 100V Electrolytic Non-Polarized Crossover Capacitor
17uF 100V Electrolytic Non-Polarized Crossover Capacitor

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