Archive for the ‘40-60lbs’ Category

Thunder and Lightning


Designed and built by Chris Wilson

Gonçalo alves is a Brazilian hardwood. It is sometimes referred to as tigerwood — a name that underscores the wood’s often dramatic, contrasting color scheme, that some compare to rosewood. It is considered one of the most beautiful of tropical woods, has a tough reputation, too. Strong and durable, it’s used for construction in its homeland and secondarily for fine furniture.

I wanted my speakers to be different. So I built a Lichtenberg machine and burnt Lichtenberg figures into the front side of my baffle. Finished by filling with blue glow-in-the-dark resin, I think I fulfilled my goal.

Since I invested so much time into the outward appearance, sound quality would have to be top notch. That is why I bought ribbon tweeters and ceramic woofers for the desktop monitors. The combination of those two provided the widest possible range (55Hz-22kHz) while having the flattest response. The subwoofer had to go as low as possible while still being inconspicuous and out of the way. The final design follows closely the form-factor of the footrest that is beneath my desk and is painted black. With its 10″ subwoofer and sealed cabinet design, it can get as low as 28Hz.

Design Goals

  • Visually appealing in a unique way
  • Flat response
  • Full range
  • Relatively Portable

Key Features

  • Unique lightning bolt effect
  • Beautiful wood grain with hand-rubbed oil finish
  • Sealed enclosures for increased transient response
  • Flat tuning



  • Measured F3 of 28Hz
  • +/- .7dB from 100Hz – 22kHz
  • Sealed box including sub
  • Fountek Neo X 1.0 ribbon Tweeter
  • 6″ SB Acoustics SB17CAC35-8 ceramic woofer
  • 10″ Dayton Audio RSS265HF-8 subwoofer
  • Desktop monitors 8.5” x 11” x 14”
  • Subwoofer 15”H x 15”D x 20”W with integrated legs

Overall Frequency Response

Overall PerformanceThe subwoofer and desktop monitor were placed on a tall stand to simulate anechoic conditions. Because of this, the subwoofer is not receiving the 3-6dB boost from the boundary effect from the floor.

Horizontal Off-Axis Response – 0º, 15º, 30º, & 60º off axis

Horizontal Off-Axis ResponseThis measurement was taken closer to the floor. The flat frequency response is being affected by floor reflections. The main data points to look at are above 5kHz.

Overall Waterfall Plot

Waterfall Plot - Full

Impulse Response

Impulse Response

Photo Gallery

This slideshow requires JavaScript.


Designed & Built by Henry Sendek
  • Design Goals:
    • Full-Range Loudspeakers for Living Room Entertainment
    • Relatively Portable
    • Extended Bass
  • Specifications:
    • Dual 5″ SB Acoustics SB15CAC30 Woofers
    • Single 5″ Ribbon Fountek CD2.0 Tweeter
    • 2.5Way Active & Passive Crossovers
  • Features:
    • F3 of 45Hz
    • +2dB/-3dB (45Hz to 20kHz)
    • 94dB (Max Continuous SPL)
Full Loudspeaker (Red) | Tweeter (Blue) | Top Woofer (Yellow) | Bottom Woofer (Purple)


April 26, 2018 Leave a comment

IMG_2951Designed by Devin Deal

Design Goals:

  • Pleasurable Listening
  • Low Frequency Extension
  • Aesthetically Pleasing
  • Simple Build


  • Dayton Audio RS225-8 Woofer
  • SB Acoustics SB26STCN-C000-4 Tweeter
  • MiniDSP PWR-ICE 125 Plate Amp
  • Maple Front Face
  • Different Stain on Sides/Top/Back Than Front
  • False Bottom to House MiniDSP

Frequency Response:

4:23:18 rightIntegrated Frequency Response:

Screen Shot 2018-04-26 at 11.51.06 PMOff-Axis Response:

Screen Shot 2018-04-26 at 11.52.59 PM.pngHarmonic Distortion:

Screen Shot 2018-04-26 at 11.53.31 PM.png

DD-8 Speaker Glossy v4

MC8R Studio Reference Monitors


IMG_0469Designed by Michael Chopp

Design Goals:

  • Portable music mixing monitors for professional use
  • Flat frequency response full range
  • $1000 budget
  • Natural wood look – visually appealing

Key Specifications:

  • Drivers
    • Fountek Neo X 2.0 Ribbon Tweeter
    • Fountek 8″ FW200 Midwoofer
  • F3 of 40Hz – Vented Enclosure
    • 2″ port on front baffle
  • +/- 1.5dB from 50Hz – 20kHz
  • 0.1% THD from 50Hz – 20kHz
  • Dimensions: 13″ x 22″ x 17″ (w, h, d)
  • MiniDSP active crossover
    • Tweeter at 1.8kHz
    • Woofer at 2.2kHz
  • Baltic birch exterior, MDF interior

Frequency Response:

Screen Shot 2018-04-26 at 12.11.46 PM

Integrated Frequency Response:

Screen Shot 2018-04-26 at 12.11.31 PM

Off Axis Response:

Screen Shot 2018-04-26 at 12.20.03 PM

Harmonic Distortion:

Screen Shot 2018-04-26 at 12.19.47 PM

MC8R Design Binder

MC8R Speaker Glossy



JJM-001 Home Theatre Loudspeakers


Designed, Constructed, and Tuned by Jonah Mueller

Design Goals:

  • Floor-standing for Home Theatre
  • Full Range 2.0 System
  • Flat Frequency Response
  • Pleasing Sound & Looks

Key Features:

  • Vented Cabinet Design
  • +/- 2dB Frequency Response
  • F3 of 19.5Hz when placed near wall (45Hz free air)
  • <1% Harmonic Distortion
  • Smooth Off-Axis Roll-Off


  • SB Acoustics SB26STAC-C000-4 1″ Textile Dome Tweeter
  • Dayton Audio RS225-8 8″ Aluminum Cone Woofer

Frequency Response (Integrated):Integrated Frequency Response.png

Off-Axis Response:

Off-Axis Response.png

Harmonic Distortion:

Harmonic Distortion.png

Speaker Glossy

Research Paper

NC-17 Reference Monitors

April 28, 2017 Leave a comment


Designed by Nick Cecconi

Design Goals:

  • Mixing monitors for home
  • Inspired by C-17 airplane
  • Flat frequency response
  • Budget: $1000

Key Features:

  • F3 of 56 Hz
  • Vented enclosure
  • Battleship gray finish
  • Dimensions: 12” x 15” x 17”
  • +/- 1 dB from 56 Hz to 18 kHz
  • MiniDSP 2-way crossover @ 1.8 kHz
  • 1/2″ Maple w/veneer core, 1/2″ MDF


  • SB Acoustics SB26STAC 1″ Textile Dome Tweeter
  • SB Acoustics SB23NACS 8″ Aluminum Cone Woofer

Frequency Response:


Integrated Frequency Response:

Integrated Frequency Response.png

NC-17 Research Paper

NC-17 Speaker Glossy


April 27, 2017 Leave a comment

Designed By Samuel James Balk
Design Goals:
– 2.5-way design
– Active processing
– F3 of at least 50Hz
– Visually striking
Key Features:
– 2.5-way design
– +/-1.5dB from 50Hz to 30,000Hz
– Excellent Off-Axis Response
– Handmade compound front baffle constructed with layered 1.5″ MDF wrapped in carbon fiber
– Sealed enclosure
– Rear cabinet constructed with 1/2″ plywood and 1/2″ MDF sandwiching mass loaded vinyl
– 4th order asymmetrical crossover at 2200Hz
Fountek FW200 8″ Aluminum Woofers
Fountek NEO X 3.0 Ribbon Tweeter
Frequency Response
Full System FR
Integrated Frequency Response


8X25R Research

8X25R Glossy