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.

Drivers
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

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

El Palmisté

Overview

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

Drivers

Scan-Speak Discovery 22W 8″ Woofer

SEAS Prestige 27TDFC 1″ Textile Dome Tweeter

Cabinet

Each wall consists of:

3/4″ ply, 1/8″ loaded vinyl, 3/4″ MDF

Documents

Speaker Drafting

Crossover Schematic

Design Statement

Speaker Glossy

Final Test Report

Tests

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

Phase

Frequency Response Difference Between Speakers

Waterfall Plot in an Anechoic Chamber

Woofer

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

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

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