Tone Buck Two’s

The Tone Buck Two’s were built with the intention of having nice home entertainment speakers. I wanted a aesthetically pleasing good sounding set of speakers. I prioritized SPL and size. With my typical listening in mind I was not very worried about low frequency extension.

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Goals

• Aesthetically Pleasing
• Flat frequency response
• Low distortion

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Drivers

• Tweeter:SB Acoustics SB26CDC-C000-4
• Midwoofer:SB Acoustics SB17CAC35-4
• Subwoofer:RSS265HO-4 10″ Reference HO Subwoofer

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Measurements

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Horizontal²&Vertical³

On axis frequency response (pink), 30 degree off axis (Blue) 60 degrees off axis (yellow)

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tone-buck-twos-finalpaper-crmoyers-2Download

8X25R

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

Drivers:

Fountek FW200 8″ Aluminum Woofers

Fountek NEO X 3.0 Ribbon Tweeter

Frequency Response

Integrated Frequency Response

8X25R Research

8X25R Glossy

 

AJJ 994’s 3-Way Floorstanding Passive System

Designed by: Andrew ‘AJ’ Diehl

Design Goals:

• Sealed enclosure for tight response
• Passive because it’s awesome
• Tight bass
• Accurate reproduction of sound for crucial listening

 

Key Features:

• F3 of 39 Hz
• +/- 3 dB from 90 Hz to 22 kHz
• 3^rd Order Crossover at 2 kHz and 130 Hz
• Additional 3^rd Order Crossover at 300 Hz on Subwoofer
• Optional 45 Hz Notch Filter on Subwoofer to control nasty resonance
• Artist from Chicago will be painting both speakers in abstract form

 

Drivers:

• Tweeter:
  SB Acoustics SB29RDC-C000-4 Ring Dome Tweeter
• Mid-Woofer:
  SB Acoustics SB15NRXC30-4 5″ Woofer
• Subwoofer:
  SB Acoustics SB34NRX75-6 12″ Woofer

Side note on responses: notch filter is included in final results.

Download Glossy: AJJ 994 Speaker Glossy
Download Report: AJJ-994 Transducer Report

Parviflorus UP-906

Designed by:  Chris Trevino

Design Goals:

• Mixing Monitors for Game & Film SFX
• Classic Look
• Tight, Accurate Sound
• Adaptable (designed around MiniDSP)
• Medium portability
• Budget: $1200

Key Features:

• F3 of 43Hz
• +-2dB from 53Hz-20Khz (after microphone adjustment)
• 2nd Order LR Crossovers (Woofer @ 2500Hz; Tweeter @ 2000Hz)
• Sealed Box
• 7/8″ Cherrywood Front Baffles
• MiniDSP Amplifier
• Under Budget: Actual Cost $1100

Drivers:

• SB Acoustics SB23NACS45-8
• SB Acoustics SB26ADC-C000-4

Frequency Response (Unadjusted from Microphone Idiosyncrasies):

Integrated Frequency Response(Unadjusted from Microphone Idiosyncrasies):

Impulse Response:

Waterfall Plot:

Documentation: 

UP906 Research Paper

UP906 Handout

The Krakens – 3-Way Sealed System

Designed by Renata Putzig

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

 

 

The Krakens Final Report

Epimetheus

Overview:

I set out to create critical listening speakers that will be enjoyable in any room you put them in. This was accomplished by creating a floor standing pair of speakers with great off axis response to make the largest “sweet spot” to fully enjoy your music. I believe speakers should be flexible enough to be an afterthought when you are relaxing to your favorite music.

Epimetheus utilizes a passive 2.5-way crossover design which means, compared to a 2-way crossover, there is an additional woofer that handles only the bass frequency.

Features:

+/- 2 dB from 70 to 17k Hz

Great Off Axis Response

Under $800

Floor standing

F3: 60 Hz

Drivers:

Tweeter: The Morel MDT29 was selected for it’s good off axis performance, and low frequency extension that allows it to be crossed over around 1800 Hz

Woofer: The Seas L16RN-SL was selected because its Q(tc) indicated it was suited for a sealed box, plus it has good low frequency extension for its size.

Documentation:

Testing Report

Crossover Schematic

Drafting

Testing Results:

Full Range

Purple: Full Range, Red: Tweeter, Blue: Mid-Woofer, Green: .5 Woofer

Full Range, Mid Woofer Inverted

Horizontal Off Axis Response

Purple: 0º, Red:15º, Green: 30º, Blue: 45º, Orange: 60º

Vertical Off Axis Response

Purple: 0º, Red:15º, Green: 30º, Blue: 45º, Orange: 60º

Harmonic Distortion:

Step Response: 

Impulse Response:

Minimum Phase Response:

Waterfall:

Tweeter Response:

Woofer Response:

Epimetheus by Russell Goddard is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.