Archive for the ‘5-8’ 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

The Royals


Design by:
Ben Jaszczak


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.


  • 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

Ben Jaszczak Crossover Graph (1)

Research & Design Paper

The Royals Glossy

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

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.

Wharfdale W90 project

April 18, 2011 2 comments

Wharfdale W90

Wharfdale W90 project

This project was intended to refurbish a set of Wharfdale W90 “six” way speakers. These speakers were old, had poor frequency extension, a lot of distortion, and a frequency response curve that looked as if a pice of spaghetti had been thrown at the spl chart. Despite this there was some unique concepts that went in to the design of these speakers originally and to be honist studying the designs of this old set of hi-fi speakers was more educational that building the speakers themselves. These speakers featured a rear baffle that was filled with sand in between two layers of wood this clever dampening design if implemented more fully though out the cabinet design process could be a useful tool in making enclosures that are both ridged and dampened. The 12 inch woofers had a unique design as well. Each cab used two woofers in a separate enclosure. This was done for the purpose of tuning one of the enclosures differently. To achieve this Wharfdale filled one of the cones with Styrofoam, this changed the moving mass of the piston (the cone of the driver) it also decreased the surface area. I suspect that this was done to even out the low end frequency response by filling in gaps that the normal woofer had ether in the low end or the high end of its range. these speakers also had a strange mid range and tweeter design. The tweeter and mid range drivers were not placed in a sealed enclosure as most cone mid range drivers and tweeters are rather they were placed in an open box(see pics below). this open box design created a lot of positive and negative summation due to the reflections off of the rear baffle and the sides and tops of the box. these reflections were severely detrimental to the frequency response and over all clarity. After the speakers had been finished I ran in to the same problem; how ever it was nearly as dramatic as in the original design. Due to the fact that  cloth dome tweeters and mid range drivers were selected only the reflections off of the sides of the boxes that caused summation issues. I plan to experiment with this later to see how much moving the front baffle forward improves the frequency response. There is no doubt in my mind that the amplitude of summation is directly related to the depth of the open box. Over all the goal of improving the quality of these speakers was accomplished; the frequency response was improved and the F3 was increased to about 70 Hz from an original extension of about 100 Hz. However the comb filtering effect caused by the cab design makes these speakers sound boxy and dated. In the end these vintage Hi-Fi cabs retained a vintage tone but with greater detail and frequency extension while having flatter frequency response.

Initial Testing

Original Frequency Response At 0 Degrees and 3 Feet.

The Tweeter and The Mid They Could Not Be Tested Alone

Woofer Response


the full system at 0, 15, 30, 45, and 60 degrees offset

Left right comparison

Vertical off axis at 0, 15, 30, 45, and 60 degrees

Ful system Harmonic distortion percentage

Ful system minimum phase

Full system Waterfall

Tweeter offset at 0, 15, 30, 45, 60 degrees

Tweeter left right difference

Tweeter Vertical At 0, 15, 30, 45, and 60 Degrees

Tweeter Total Harmonic Distortion

Tweeter Impulse Response

Tweeter Minium Phase Response

Mid At 0, 15, 30, 45, 60 degrees offset

Mid Left Right Difference

Mid Vertical Off Axis Response

Mid Harmonic Distortion

Mid Impulse Response

Mid Min Phase

Mid Waterfall

Woofer At 0, 15, 30, 45, ND 60 Degrees offset

Woofer Left Right

Woofer Verticle Offset At 0, 15, 30, 45, and 60 Degrees

Woofer Harmonic

Woofer Impulse
Woofer Min Phase

Woofer Water Fall