Archive for the ‘90+lbs’ Category

Jupiter 6103s



Juglans nigra, more commonly known as Eastern Black Walnut or simply Walnut, has long been one of the most sought after cabinetry hardwoods in North America. Taking its name from the Roman god of the sky, Jupiter, (Juglans being a compounding of the Latin for Jupiter’s Acorn), its remarkable strength, striking color, and fine workability have made it a favorite among woodworkers the world over for centuries, truly a wood worthy of its godly namesake.

Walnut was the clear choice for this design as it immediately evokes the feeling of a classic 70s hi-fi stereo. The rich brown of the walls and the black front baffle were a near uniformity of hi-fi speakers of the era. And the sound too aims to capture some of the feeling often associated with that era of music: warm, laid-back, and pleasant. However, the retro-styled exterior belies a very modern internal system.

A fully digital crossover networks allows for the fine tuning of the entire system to suit the needs of any particular room. The 3-way functionality also allows each driver to function within its most efficient frequency range. The height is calculated to center the mid and tweeter with an average listener’s ear when seated on an average couch (roughly 40″ from the ground).

With their end use being “do-anything” living room stereo towers, these speakers need to be able to cope with a wide array of content, from background music to intensive “home” mix review, from television to intense cinema. Versatility is key to their very existence.

Key Points

  • Balanced, broad frequency response 30 Hz – 30 kHz
  • Clarity through entire frequency band
  • Warm, flattering  music playback
  • Classic visual aesthetic
  • Fountek NeoCD 3.5H – Horn Loaded Ribbon Tweeters
  • SB Acoustics SB17CAC35 – Ceramic 6″ Mid-Woofers
  • Dayton Audio RSS265HF – Aluminum 10″ Subwoofers
  • 3-Way digital crossover (miniDSP 2×8)
  • +/- 1.5dB 30Hz – 30 kHz
  • f3 of 28Hz
  • f10 of 21Hz
  • Hand-rubbed oil finished Eastern Black Walnut Cabinet
  • Double-walled front baffle for added rigidity
  • Fully sealed enclosure for increased transient definition
  • Warm, flattering frequency response

Selected Measurements

Overall Frequency Response (60 dB range)


Integrated Frequency Response (20 dB range)


Overall Harmonic Distortion


Integrated Step Response


Overall Waterfall Plot (18 dB Range)


Photo Gallery

This slideshow requires JavaScript.

Jupiter 6103 Glossy





Prunus serotina, or black cherry, is a hardwood species found throughout the Upper Peninsula of Michigan. It is known not only for burning all night in the wood stove, but also for it’s gorgeous color, figure, and grain pattern when properly finished. It was for this reason that Black Cherry was chosen to comprise the the baffles of these loudspeakers, eventually leading to the name Serotina.

From the beginning the intention was for these loudspeakers to provide the most pure, uncolored reproduction of any audio signal that was passed through the system. This meant a very broad spectral response and extremely accurate transient reproduction were necessary of the final product, and were achieved by employing multiple high-quality drivers and sizable, sealed enclosures.

An active crossover network ensures that the system can be fine-tuned for a wide variety of applications. At 6′-4″ they are stretched to accommodate the height of the end user when at a standing desk. However, with a quick re-alignment of the drivers using delay presets, the same great results can be enjoyed from a seated position for an extended stereo listening session or home theater application.

Key Points

  • Uniform Frequency Response
  • Highly Versatile
  • Clean System Integration
  • Pleasing, Natural Aesthetics
  • Raven Point Source Tweeter
  • 5″ Eton 5-212/C8/25 HEX Woofer
  • 10″ Focal P25FS Subwoofer
  • 3.5 Way Active Crossover Network [MiniDSP]
  • +/- 1.5dB From 40Hz to 22kHz
  • 3dB down @31Hz
  • 10dB down @25Hz
  • Oiled Black Cherry baffles
  • Tall for use at a standing desk
  • Sealed cabinets provide accurate transient response
  • A narrow front baffle makes for wide horizontal dispersion
  • Removable back panel for future access

Selected Measurements

Integrated Frequency Responseserotina integrated
Horizontal Off-Axis Response serotina horizontal

Blue = 60deg | Lime = 45deg | Red = 30deg [listening axis] | Purple = 15deg

Serotina with designer


South 7082

April 27, 2018 Leave a comment

South 7082_cdsouthw.JPGDesigned by Charles Southward 

Design Goals:

  • Floor Standing
  • Nice Off-Axis
  • Flat Frequency Response
  • Aesthetically Match Room

Design Specs:

  • Tweeter: SB Acoustics SB26STAC-C000-4
  • Woofer: Dayton Audio RS225-8
  • miniDSP PWR-ICE 125 Plate Amplifier
  • +- 1dB 45Hz-19kHz
  • f3 of 38Hz

Paper: Charles Southward Speaker Binder_Rev6

Glossy: South7082s Glossy_cdsouthw


Frequency Response



April 26, 2018 Leave a comment


Designed by Henry Ashburn

Design Goals:

  • High SPL output
  • F3 of 30 Hz
  • Aesthetically beautiful
  • Wide horizontal dispersion


  • Ribbon tweeter, mid-woofer, 12″ side-firing subwoofer
  • MiniDSP PWR-ICE 250
  • Separate enclosures
  • F3 of 31 Hz
  • ± 3 dB frequency response

Frequency Response

HA-3 Frequency Response

Integrated Frequency Response

HA-3 Integrated Frequency Response

Off-Axis Frequency Response

HA-3 Off Axis Frequency Response

Harmonic Distortion Percentage

HA-3 Harmonic Distortion Percentage

HA-3 Speaker Glossy

Smooth Smith Audio – 312c

April 29, 2017 Leave a comment


Designed by Eric “Smooth” Smith

Design Goals:

  • Hybrid as mixing monitors and entertainment system
  • Partially mobile/ Easy to fit in smaller spaces
  • Flat frequency response with variable low end
  • Budget: $2500

Key Features:

  • F3 of 28Hz
  • Sealed enclosure
  • +/- 1 dB from 150Hz to 20kHz
  • +/- 2 dB from 30Hz to 150Hz
  • MiniDSP active crossover @ 130 Hz, passive crossover at 3.5kHz
  • 1/2″ MDF, 1/2″ Cherry MDF


  • Eton 25SD-1 1″ Soft Dome Tweeter
  • Dayton Audio RS150P-4 6″ Paper Cone Woofer
  • Dayton Audio RSS315HF-4 12″ Aluminum Cone Woofer


Frequency Response:


F - 60

Integrated Frequency Response:

F IntOff-Axis Response

F - Horizontal Off-Axis

Harmonic Distortion

F - Harm Dist

Rear Sub-woofer Connection


Sandcastle 7.2


Designed by: Eric Bartos


  • 7.2 surround sound system for enjoyment and the occasional mix
  • +/- 4dB response
  • active crossover

Key Features

  • F3 of 38Hz on surround speakers (before crossover between subwoofer)
  • F3 of 34Hz on center speaker (before crossover between subwoofer)
  • F3 of 24Hz on subwoofers
  • +/- 4dB from 50Hz to 21kHz on surround speakers
  • +/- 4dB from 47Hz to 21kHz on center speaker
  • +/- 2dB from 25Hz to 200Hz on subwoofer
  • center speaker has active/passive crossover system
  • 1/2″ birch ply and 1/2″ MDF construction for center speaker and surround speakers
  • 1/2″ birch ply and 3/4″ MDF construction for subwoofers
  • BSS Blu-100 & BSS Blu-BoB for DSP


  • Woofer: Dayton Audio RS225-8
  • Tweeter: Seas Prestige 19TFF1
  • Midrange (Center speaker only): Dayton Audio RS52AN-8
  • Subwoofer: Eminence LAB12-C

Frequency Response

Surround speakers

Surround Overall 60db range

Surround Integrated Response

surround integrated 40

Center Speaker

center response 60.png

Center Integrated Response

center integrated 40


sub response 60

Sandcastle glossy

Sandcastle Research Paper

Sandcastle Final Testing

TW-84 Home Entertainment Speakers

April 29, 2016 Leave a comment

TW-84 Pic

Design Goals

  • Pleasurable
  • Fairly Flat Frequency Response
  • Passive Crossover
  • Ported Enclosure For Increased Low End
  • Pair With External Subwoofer
  • Sound Good Alone As Well

Key Features 

  • WxDxH = 1′ x 1′ 3/8″ x 3′ 9 1/2″
  • +/- 2dB from 40-20,000Hz
  • 2 Way Design
  • F3 of 37 Hz


  • Scanspeak D2604/32000
  • Dayton Audio RS225


Frequency Response



Design & Final Testing Report