Aeternus Lux 2.2 Modular System

May 11, 2013 Leave a comment

Design and Construction:

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Paul Kirby

Design Goals

  • Portable
  • Low Fatigue
  • Low bass extension
  • Modular
  • Good horizontal Off-axis
  • Eventual use in 5.1 system

Key Features 

  • Large Size WxDxH = 9″x1’2″x4’10″
  • +/- 1.5dB from 75-20,000Hz
  • MTM Design
  • Inset tweeter for minimal distance between woofers, hence minimal vertical lobbing
  • Side-firing subwoofer modules (f3 of 25Hz)
  • Removable main with f3 of 70Hz
  • +/- 1.5dB from 75-20,000Hz
  • Active to passive cascaded crossover for module implementation

Drivers

  • Morel MDT30S-4 1″ Textile Dome Tweeter
  • SEAS Prestige L15RLY/P (H1141) 5.5″ Aluminum Cone Woofers
  • SB Acoustics SB29SWNRK-S75 10″ Subwoofer

Main Response (green is port measurement)

Integrated Response

Sub Response

Sub Response

Impulse Response

Impulse Response

Documentation: 

Design Report and Final Testing

Aeternus Lux Drafting

Glossy

Enigma 44 – 2.5 Way Transmission Line System

May 10, 2013 Leave a comment

DSC_0399

Design and Constructed By:

Kevin Shawbitz

Design Goals

  • Accurate response
  • Utilize a transmission line
  • Excellent bass extension
  • Be pleasant to listen to
  • Costs $950 including stands
  • Work in a variety of rooms

Key Features

  • Large size (LxWxH= 8.25″x18″x38.25″)
  • F3 of  44 Hz when near a wall
  • ±2dB response
  • Clean, articulate bass
  • Costs $950

Drivers

  • SEAS Prestige CA15RLY (H1216) 5.5″ Coated Paper Cone Woofer
  • ScanSpeak Discovery D2608/9130 1″ Textile Dome HDS Tweeter

Frequency Response

Final Integrated Response Speaker B 24dB

Impulse Response

Final Impulse Response Speaker B

Enigma 44 Design Proposal and Testing Report

Drafting

Speaker Glossy

PA 2201 Midfields


PA 2201

Design By:

Thomas Conran

Key Features

  • Medium size (LxWxH= 27″x9″x15″)
  • F3 of 56Hz
  • +/- 2dB response
  • Tight, accurate sound

Drivers

  • SB Acoustics SB23NRXS45-8  woofer
  • Tang Band 75-1558SE  midrange
  • Fountek NeoCD 2.0

Frequency Response

Frequency Response PA2201

Intergrated Frequency Response

Integrated Frequency Response PA2201

Developmental Report PA2201

Glossy PA2201

Design Statment for PA 2201 Midfields

Final Testing Measurements

Griff ’91


IMG_4509

Design and Constructed By:

Collin Doerr-Newton

Design Goals

  • Portability
  • Accurate response
  • Good bass extension
  • Be pleasant to listen to
  • Under $700

Key Features

  • Medium size (LxWxH= 16″x12″x20″)
  • F3 of about 50Hz
  • +/- 2dB response
  • Big open sound
  • Well under $700

Drivers

  • SBAcoustics SB17NRXC35-8 woofer
  • Vifa XT25TG30-04 tweeter

Chosen Testing Results

Integrated Frequency Response

Red- Overall Response, Purple- Woofer Response, Green- Tweeter Response

Red- Overall Response, Purple- Woofer Response,
Green- Tweeter Response

Horizontal Off-Axis Response

Red- 0 degrees, Yellow- 15 degrees, Purple- 30 degrees, Red (2)- 45 degrees, Green- 60 degrees

Documentation

Griff ‘91 Design

Griff ‘91 Final Testing

Griff ’91 Glossy

Griff ’91 Crossover

The Krakens – 3-Way Sealed System


Designed by Renata PutzigIMG_4603

Design Goals

  • Large Soundfield
  • Low fatigue
  • Accurate transients
  • For casual listening and movies
  • Aesthetically pleasing

Key Features

  • +/-2 dB from 70Hz to 20 kHz
  • F3 of 50Hz
  • Solid cherry
  • Sealed box
  • Ribbon tweeter
  • 14 3/4″ x 24 3/4″ x 21 3/4″
  • Cost: ~$1000

Drivers

  • SB Acoustics SB23NRXS45 8″
  • Seas Prestige MCA12RC H1304 4.5″
  • Fountek NeoX 2.0 Ribbon Tweeter

FR all+ drivers zoomed

 

 

The Krakens Final Report

Euphony Blues

May 9, 2013 1 comment

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Design and Construction by Lindsey L. Johns.

Design Goals:

  1. Accurate frequency response: at least +/- 3 dB, preferably +/- 1.5 dB, low distortion
  2. Accurate bass response down to at least 60 dB
  3. Smallest possible size for shelf or desk placement
  4. Sturdy and unique-looking cabinet
  5. Budget under $600

Results:

  1. +/- 1.5 dB between 55 Hz and 18 kHz, less than 1% harmonic distortion over 50 Hz
  2. f3 of 50 Hz
  3. Dimensions: 14″ wide, 19″ tall, 14″ deep
  4. Very sturdy cabinet with custom glossy indigo finish
  5. Cost roughly $500

Drivers:

Dayton Audio RS225-8 8” Aluminum Reference Woofer
Dayton Audio RS28F-4 1-1/8” Silk Dome Tweeter

Testing Results:

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lljohnsFinal_Waterfall_Plot

Documentation:

Design Statement and Tuning Report

Full Testing Results

Drafting

Crossover

(Note: Some documents labeled by the previous working title, “Baby Blues”)

Raving Behemoths


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Designed, Built, and Tested by Nathan Hunter

Design Goals

  • High Output
  • improved Horizontal Off-Axis Response
  • Low Frequency Extension with ƒ3 ≈ 50 Hz
  • Voicing to include Bass Boost
  • Low cost comparing to PA Speakers with similar capabilities

Features and Components

  • Diamond Shape with Rugged Exterior
  • Floor Mounting
  • Active Digital Crossover PCS 2.400
  • Selenium Pro D220Ti Horn Driver
  • Selenium Pro HC23-25 Exponential Waveguide
  • 2x Dayton Audio PA301-8 12″ Woofers
  • Carvin Cabinet Handles for easier mobility

Weight Vs. Similar Products

  • Raving Behemoths ≈ 150 lbs
  • JBL PRX612M = 34.5 lbs
  • QSC KW122 = 49 lbs

Cost Vs. Similar Products

  • Raving Behemoths ≈ $1300
  • JBL PRX612M List Price = $1299
  • QSC KW122 List Price = $1399

Testing Results

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Documentation

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