B.H.B.B. 3 Way Stereo Speakers

 

Design By:

Austin Scott

Key Features

• High Durability and Visual Aesthetics
• F3 of 35Hz
• +/- 3dB response from 100 Hz-20 kHz
• 3 way passive crossover
• Wide Horizontal Dispersion

Drivers

• Woofers: SB Acoustics SB23MFCL45-8
• Midrange: SB Acoustics SB12MNRX-25-04
• Tweeter: Fountek NeoCD 3.0M

 

Frequency Response

Integrated Frequency Response

Impulse Response

BHBB Glossy

BHBB Final Drafting

 

 

DG01 Near-Field Multipurpose Monitors

DG01 NEAR-FIELD MONITORS
The DG01 speakers are multipurpose mixing and listening speakers designed for near-field use. Despite their size, these desktop speakers were made to be listened to from a distance of only about a foot away.
To achieve the low end necessary for critical listening, the DG01s are designed as a ported box with a 2” port on the rear side. While this causes some loss of transient accuracy, it is more than made up for by the low-frequency extension. These speakers manage to reach an F3 of 38Hz while also boasting a +/- 3dB range from ~40Hz-19kHz. The range is possible due to the excellent drivers selected for the job—Dayton Audio RS225-8 for the woofers and SB Acoustics SB26STAC-C000-4 for the tweeters. With the use of a MiniDSP PWR-ICE125 amplifier and DSP unit for each monitor, a fairly flat response is easily achieved. With the design comes a very strong center image and a large sound stage.

QUICK FACTS:
Crossover: 4th-order, woofer at 2.2kHz, tweeter at 2kHz
Response: +/-3dB ~40Hz-19kHz
F3: 38Hz
Total cost (w/o MiniDSP): ~$400
Box materials: 1/2” MDF with 3/4” birch plywood
Size: 19”Hx15”Wx18”D
Tweeter: SB Acoustics SB26STAC-C000-4
Woofer: Dayton Audio RS225-8

DG01 Speaker Glossy

DG01 Speaker Research & Design

Subfusc

Goals:

• Low frequency extension, down to 40Hz
• Flat frequency response.
• Budget of around $1000
• Portability

Features:

• 2-way system.
• MiniDSP Active Crossovers
• Vented cabinet for low frequency extension.
• Flat response curve
• +/1.25 from 100Hz to 15kHz
• F3 at 36Hz

Cabinet:

• 1/2” 9-ply baltic birch exterior
• 1/2″ MDF interior.
• 1” Acrylic around woofers
• Black Plastidip coating
• 1.4 cubic feet interior

Drivers:

• Dayton Audio RS225-8 8” Reference Woofer
• SB Acoustics SB29-RDC-C000-4 1” Ring Dome Tweeter

 

Subfusc Design Process, Construction, and Documentation

Subfusc Speaker Glossy

 

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 Royals

Design by:
Ben Jaszczak

Description:

The Royals are sealed, active, two way speakers intended for small room film mixing and general listening. The front and top of the speakers are made with solid  and unstained Purple Heart hardwood. The design intent for these speakers was to have relatively dry, high accuracy speakers with as far of a low end extension as possible within my budget and mobility constraints. The large sealed cabinet design serves to provide both fidelity, low end extension and clean low end transients. at ± 1dB The Royals achieve optimal frequency response when tuned for a specific room, as acoustic changes in any given room can have significant effects on the frequency response. The overall price of the two speakers was approximately $1,000.

Design:

• Purple Heart hardwood and Baltic Birch plywood construction
• Tang Band W6 1721 6 1/2″ paper cone woofers
• SB Acoustic SB26STAC 1″ soft dome tweeters
• MiniDSP PWR-ICE125 140W plate amplifier

Tech Specs:

• Meets THX Standard 85dB with 20dB headroom
• ± 1dB from 70Hz to 20kHz
• F3 at 50Hz

Research & Design Paper

The Royals Glossy

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

Euphony Blues

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:

Documentation:

Design Statement and Tuning Report

Full Testing Results

Drafting

Crossover

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

Raving Behemoths

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

Documentation

• Full Report
• Glossy

The Alussa Valo

Design Goals:

• Small Size
• Balanced Frequency Extension
• Nice Clarity
• Under $800

Features:

• Robust Sound
• +/- 3 dB Frequency Response
• Translucent
• Sound Fills Large Room, Despite Their Size

Design Statement

Drafting

• Stereo Pair External 3 Views
• Stereo Pair Internal 3 Views
• Subwoofer External 3 Views
• Subwoofer Internal 3 Views

Final Testing Report

Testing Results

Frequency Response

Horizontal Off-Axis Response

Vertical Off-Axis

Impulse Response

DKS 800

Design Goals
-Full extended frequency response
-Evenness in frequency
-Balance in frequency

Drivers
-Tweeter Audax TW025A8
-Woofer: Silver Flute 8 Wool cone 4 ohm

Materials
-1/4″ MDF
-3/4″ OSB plywood

Documents:

DIMENSIONS FOR DKS 800

crossover schematic

Tuning Report

Whole System Response

Initial Woofer

Initial Tweeter

Whole System Waterfall

DKS 800 by Daniel Serunjogi is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.