Archive for the ‘Ring Radiator’ Category

The Dark Passengers – 2 Way Ported Nearfields

The Dark Passengers - Near Field Mixing Monitors

Designed and constructed by Andrew Villa

Design Goals

  • Portable
  • Accurate Response
  • Hi-Fidelity for creating/mixing SFX, Dialogue, and music
  • Tight transients
  • Good horizontal Off-axis
  • Dexter Themed
  • Used as Nearfield monitors

Key Features

  • Small size: 12 1/4″ x 10 1/4″ x 16 1/4″
  • +/- 1.6 dB from 80 – 20 kHz
  • Vented Enclosure = decent bass for small near fields
  • Cost $400
  • F3 of 72 Hz
  • Tight, precise sound
  • Great Clarity
  • Unique paint design


  • Fountek FW168 6.5″ Aluminum Cone Woofer
  • Vifa XT25TG30-04 1″ Ring Radiator Tweeter

Testing Results 

Overall Frequency Response:

Plot 1 - Overall Frequency Response


Integrated Frequency Response:

Plot 2- Integrated Frequency Response

Purple: Tweeter, Yellow: Woofer, Blue: Overall Sum


Impulse response:


Plot 10- Impulse Response


The Dark Passengers: design, drafting, and final testing

The Dark Passengers: Glossy


Griff ’91


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


  • 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


Griff ‘91 Design

Griff ‘91 Final Testing

Griff ’91 Glossy

Griff ’91 Crossover

Monitor 1 by Keith Kinnear

May 20, 2010 1 comment

High Performance Studio Monitors

The main objective of this design was simply to create the most accurate, high precision studio monitors possible. The speakers were able to meet that objective in almost every way thanks to some key components of the design.

One of the most influential aspects is the cabinet construction, including the unique six-sided shape and complicated panel and joint structures. They help these speakers avoid a whole host of problems traditional box designs usually have to deal with. Panel vibrations, internal cabinet standing wave resonances, and most of the effects of edge diffraction did not pose a problem with these speakers in the least.

Multi-layer cabinet construction (MDF, Baltic Birch Plywood, mass loaded vinyl, masonite)

An equally important element of the design was the choice of high quality transducers – and believe me, no expense was spared when it came to choosing the right drivers to fit the design criteria. Both the tweeters and woofers are low distortion, high bandwidth drivers that are known for their smooth, un-colored sound. Both of them are also great performers and made it easy to implement them into this, and likely almost any other, design.

The crossover is the last piece of the puzzle to be mentioned since it connects everything together and literally shapes the sound of the signal being presented to the drivers. Many hours of testing and very careful manipulation of the passive circuit elements produced a crossover that reacts with the drivers in such a way that the on-axis frequency response only varies by 2 dB across a spectrum from 50 Hz to 18 kHz. Now that’s something that anyone can be proud of.

In all, the design was a success and the speakers have proven to do exactly what they were designed for – be highly accurate, high performance studio monitors.

Creative Commons License
Monitor 1 by Keith Kinnear is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.

Design Objectives

  • Highly accurate studio monitors for precision mixing and mastering
  • Relatively low crossover point to preserve vocal presence range
  • At least 103 dB SPL max output
  • f3 = 45Hz

Key Features

  • Full range two-way design made possible by the use of wide bandwidth, low distortion drivers
  • Unique cabinet shape and construction designed to eliminate many of the common diffraction, vibration, and resonance problems found in traditional box designs
  • Exceptionally flat frequency response from 50Hz to 18 kHz
  • Excellent impulse and step (time domain) responses, indicating a lack of time smearing and greatly improved clarity and transient accuracy
  • Outstanding horizontal off-axis response
  • Sturdy handles on the sides to make movement possible

System Tests

Frequency Response

Driver Response

Reverse Polarity Response

Harmonic Distortion

Left/Right Difference

Impulse Response

Step Response

Minimum Phase Response

Tweeter Tests – Scanspeak D3004/6600-00 AirCirc

Tweeter Frequency Response

Tweeter Horizontal Response

Tweeter Distortion

Tweeter Impulse Response

Tweeter Step Response

Tweeter Phase Response

Woofer Tests – Seas L22RN4X/P  H1208

Woofer Frequency Response

Woofer Horizontal Response

Woofer Distortion

Woofer Impulse

Woofer Step

Woofer Minimum Phase

Green Run: Critical Editing Speakers

April 28, 2010 Leave a comment

What they lack in size they make up in clarity and versatility. Designed for

Green Run Right Cabinet

near-field desktop audio editing, these speakers are created to
reproduce the sound signal with maximum clarity.  Optimized and built
small to fit at any editing environment and portable for the nomad

Design Objectives:

  • Bookshelf monitors for audio editing for music, sound effects and film
  • Wide frequency range (60 Hz to 20 kHz)
  • Smooth frequency response
  • Inexpensive
Green Run

Green Run Left Cabinet

Key Features:

  • Small, and portable
  • Clear stereo image
  • Minimal off-axis coloration
  • Low crossover frequency of 1.5kHz
  • Under $500

Design Statement

Tuning Report

Crossover Schematic

Cabinet Drafting Plans

System Response
Final System Response Charts Left Cabinet

Final System Response Charts Right Cabinet

SB Acoustics 29RDCN C-0004

Final Tweeter Response Charts Left Cabinet

Final Tweeter Response Charts Right Cabinet

Fountek FW 146

Final Woofer Response Chart Left Cabinet

Final Woofer Response Chart Right Cabinet

Creative Commons License
This work is licensed under a Creative Commons Attribution-No Derivative Works 3.0 United States License.