Archive for the ‘60-90lbs’ Category


April 28, 2017 Leave a comment

Speakers 1Designed by Andrew Summers

Design Goals:

  • Create a rugged speaker system that is ready for the road
  • Flat frequency response for accurate mixing
    • +/- 3dB or better

Key Features:

  • 2.5 way hybrid crossover
    • Combination of miniDSP and passive crossover point in-between tweeter and mid-woofer
    • 2nd order crossover at 200Hz between mid- and sub-woofer (active)
    • 2nd order low pass filter on mid-woofer at 800Hz (passive)
    • 2nd order high pass filter on tweeter at 3kHz (passive)
  • F3 of 48Hz
  • +/- 2dB from 20kHz to 50Hz
  • Sealed enclosure
  • All SB Acoustics drivers
    • Sub-woofer – SB29NRX75
    • Mid-woofer – SB13PFC25-08
    • Tweeter – SB26STCN-C000-04


  • 1/4″ birch ply on all exterior walls
  • 1/2″ birch ply on front baffle
  • 1/2″ MDF on all interior walls
  • 1/2″ birch panel in between mid-woofer and sub-woofer to create a separate sub cabinet
  • 1/4″ aluminum extrusions
  • Aluminum corner caps
  • Rust-oleum Black Truck Bed Liner finish

Tux FR

FR Full System All Axis

TUX-01 Research

TUX Speaker Glossy


Not Your Grandpa’s Speakers


Designed by: Mike Schmitz

Design Goals

  • Casual listening
  • Large and noticeable
  •  Unique aesthetics
  • Passive

Key Features

  • F3 of 26 Hz
  • +/- 6 dB 26 Hz to 18 kHz
  • 2nd Order Crossover at 250 Hz, 4th Order Crossover at 2.5 kHz
  • Wide Dispersion
  • Cost less than $1200
  • Ported design
  • 3/4 in. MDF and 1/2 in. Baltic Burch construction with Maple trim.

Tweeter – Fountek Neo X 2.0 Ribbon
Midrange – SB Acoustics SB15MFC30-4
Woofer – SB Acoustics SB29NRX75-6

Frequency Response
Integrated Frequency Response
Not Your Grandpa’s Speakers Glossy
Not Your Grandpa’s Speakers Research Paper

AJJ 994’s 3-Way Floorstanding Passive System

April 28, 2016 Leave a comment


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
  • 3rd Order Crossover at 2 kHz and 130 Hz
  • Additional 3rd 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



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

Screen Shot 2016-04-28 at 4.51.51 AMScreen Shot 2016-04-28 at 4.51.40 AM

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

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

Diamond Series

April 26, 2012 1 comment

This 2.5-way pair of loudspeakers is designed for home theater use.  The design includes four Aura 6″ woofers and a 1″ ScanSpeak tweeter.  The speakers are vented with ports on the back diagonal sides, and have a passive crossover.


Design Goals

  • Cost around $500.
  • Good low frequency extension.
  • Produce 105 SPL (THX standards).
  • Low power requirements.

Key Features

  • 2.5-way system
  • passive crossover
  • vented system
  • f3 of 40hz
  • bandwidth of +/- 3 dB


Aura NS6-255-8A 6″ Woofer

ScanSpeak D2608/9130  1″ Textile Dome Tweeter


Walls are 2 layers with:

3/4″ Birch plywood, 3/4″ MDF


Design Statement

Speaker Drafting

Final Testing Report

Crossover Schematic

Speaker Glossy

Performance Graphs

Diamond Series Driver Summation (Black-Full, Red-Tweeter, Yellow-Mid, Green-Low)

Diamond Series System Decay

Diamond Series Left-Right Speaker Difference

Sonic Bluhm 2-Way Loudspeaker System

April 26, 2011 Leave a comment

Sonic Bluhm – 2-Way Loudspeaker System


  • Designed and built for use as left / right pair for home theater system.
  • Primary use, movie and music playback


  • Vented box construction, providing lower f3 frequency
  • Unique shape to avoid following problems:
    • Panel Vibrations
    • Internal cabinet standing waves
    • Edge diffraction
  • 2.1 cubic foot internal box volume
  • Capable SPL, of 90 dB Continuous, 102 peak

Cabinet Construction.

  • Cabinet made using constrained layer construction
  • There are 4 layers to my cabinet (listed from outside to inside)
    • 1) 3/4″ 13 Ply Baltic Birch
    • 2) 1/2″ MDF
    • 3) 1/8″ Mass loaded vinyl
    • 4) 1/8″ Masonite
  • Rounded top edge
  • Only 3 visible screws per speaker, giving them a very clean and polished look


  • Woofer: Seas Excel 8″ W22EX001
  • Tweeter: ScanSpeak Illuminator D3004, 1″ soft dome


Testing Results.

System Frequency Response: Purple- Port, Blue- Woofer, Green-Tweeter, Red- Summation

Frequency Response, Tweeter Polarity Flipped

Horizontal Off Axis Testing: Green 0*, Purple 15*, Red 30*, Blue 45*, Yellow 60*

Vertical Off Axis Testing: Green 0*, Red 15*, Blue 30*, Purple 45*, Yellow 60*

Step Response

Impulse Responce

System Minimum Phase Response

Woofer Impedance: Yellow- 8 Ohm resistor, Red- Speaker System

Creative Commons License
Sonic Bluhm 2-Way Loudspeaker System by Dan Bluhm is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.

Rocky Mountain 2-Way

April 22, 2011 Leave a comment

The Life That I Have Been Waiting For

Rocky Mountain 2-Way Loudspeaker System


The Rocky Mountain 2-Way Loudspeaker System was designed to be used as mixing monitors.


Flat Frequency Response (1.5dB variation)

Sealed Box Construction Providing Accurate Low Frequency Reproduction

Low Frequency Extension: F3= 55Hz, F6= 45Hz, F10= 40Hz

Active Crossover With Computer Controlled DSP that allows for the maximum control of the speaker system

Absorbent Foam Baffle that combats MF Diffraction and Makes the HF more directional.

Capable of 90-98dB Continuous, 110-115 Peak

1 1/4” Cabinet Construction (13ply Baltic Birch/MDF Composite)

2 1/4 Cubic Foot Volume

Custom Made Grill

Made Proudly In Michigan


Woofer: Seas Prestige 10″ H1411

Tweeter: Seas Prestige 27TDFC, 1″ Silk Dome Tweeter


Exterior: 3/4″ 13-ply Baltic Birch

Interior: 1/2″ MDF


Design Proposal

Drafting Plans


Final Testing Report

Block Diagram:

Block Diagram

Testing Results:

Speaker 2 All Drivers

Speaker 1 All Drivers

Speakers 1 and 2 Differences Pt.1

Speakers 1 and 2 Difference Pt 2

Speaker 1 Polarity Flipped Tweeter

Horizontal Off Axis (Black 0*, Green 30*, Red *45, Blue *60, Red *90)

Vertical Axis Frequency Response (Black 0*,Blue *30, Orange 45*, Green 60*, Blue *90)

Tweeter Horizontal Off-Axis Purple=0*, Orange=30*,Red=45*,Green=60*)

Woofer Horizontal Off-Axis (Blue=0*, Orange=30*, Green=45*, Red=60*)

Tweeter Vertical Axis (Purple=0*, Green=45*)

Woofer Vertical Axis (Blue=0*, Red=45*)

Full System Speaker 2 Step Response

Full System Speaker 2 Impulse Response

Tweeter Step Response

Woofer Step Response

Full System Minimum Phase Response

Woofer Impedance Compared with 8Ohm Resistor

Tweeter Impedance Compared With 6Ohm Resistor

Cross-Over Response

Creative Commons License
Rocky Mountain 2-Way Loudspeaker System by Kenneth G. Stahl III is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Based on a work at

El Palmisté

April 19, 2011 Leave a comment


The two-way pair of loudspeakers are designed to function as film and music mixing monitors.  The design includes an 8″ woofer and a 1″ tweeter mounted against a waveguide to improve its potential.  The speakers are vented with a port on each inner side, and have a passive crossover.


Design Goals

  • Produce 103 spl to meet film mixing standards (83dB SPL with 20 db of headroom).
  • Flat frequency response and maintain detailed sound.
  • Good low frequency extension.
  • Cost around $500.
  • Be somewhat easy to move.

Key Features

  • 2-way system
  • passive crossover
  • vented system
  • dome tweeter mounted to waveguide
  • f3 of 40hz
  • bandwidth of +/- 2.5 dB  from 40hz-19khz


Scan-Speak Discovery 22W 8″ Woofer

SEAS Prestige 27TDFC 1″ Textile Dome Tweeter


Each wall consists of:

3/4″ ply, 1/8″ loaded vinyl, 3/4″ MDF


Speaker Drafting

Crossover Schematic

Design Statement

Speaker Glossy

Final Test Report

not a big deal


Frequency Response With Woofer/Tweeter Summation

Horizontal Off Axis Response (15,30,45,60)
Vertical Off Axis (15,30,45,60)

Frequency Response with Inverted Phase

Step Response

Impulse Response

Impedance as compared to an 8 ohm resister with port and total response

Harmonic Distortion


Frequency Response Difference Between Speakers

Waterfall Plot in an Anechoic Chamber


Woofer Response
Woofer Horizontal Off Axis (15,30,45,60)

Woofer Vertical Off Axis (15,30,45,60)

Woofer Step Response

Woofer Impulse Response

Woofer Harmonic Distortion
Woofer Phase

Woofer Response Difference Between Both Speakers


Tweeter Frequency Response

Tweeter Horizontal Off Axis (15,30,45,60)
Tweeter Vertical Off Axis (15,30,45,60)

Tweeter Step Response

Tweeter Impulse Response

Tweeter Harmonic Distortion

Tweeter Phase

Tweeter Difference Between Speakers

Creative Commons License

El Palmisté by Alex Palma is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.