Quarter Wavelength Loudspeaker Design Gallery

Shown below are some pictures of quarter wavelength loudspeaker designs that people have built. Some of these projects are direct copies of my designs while others are original designs generated using my MathCad worksheets. Under each picture is the builder's name and an e-mail link so you can ask questions or provide some feedback. If you have also built a quarter wavelength loudspeaker design based on my MathCad worksheets, please feel free to send me a picture for inclusion in this gallery.

The Amarosos ML TL Using a Dayton RS225-8 Woofer, a BG NEO8 Midrange, and a Hiquphon OW2 Tweeter


The Crossover is Built into the Base

Built by Paul Kittinger


Peerless 8" Woofer and Foster Horn Driver on an Open Baffle w/ Goldwood GW-1858 H Frame Woofer

Built by James Householder


Open Baffle Using an AER Full Range Driver and an AE Dipole 15 Woofer

Built by David Zicho


ML TL Using a Dayton RS28F Tweeter and Dayton RS225-8 Woofer

Built by Paul Kittinger


Audio Nirvana 8" Full Range Driver Open Baffle w/ Goldwood GW-1858 H Frame Woofer

Built by Jon Hoskins


Open Baffle Speakers Using a Fostex FE-103En Full Range Driver and a Pair of Goldwood 215/40/8 Woofers

Built by Sidney Ma


Cavatina ML TL Uaing a Fountek NeoCD1.0 Ribbon Tweeter, ScanSpeak 10F Midrange, and Usher 8945A Woofer

Built by Paul Kittinger


Poor Plumber's Pluto : SEAS H1480 Woofer and AURA NSW2-326-8A Tweeter

Built by Carl Richard


Continuum ML TL : Aurum Cantus AC130/F1 Woofer and Dayton RS28A Tweeter

Built by Maynard Goff


A Pair of TLs Using Fostex FE-108E Sigma and FX120 Full Range Drivers

Built by Daniel Advis


Fostex FE-103E Full Range Driver and an Eminence Alpha 15A Woofer Open Baffle Speaker

Built by Symeon Koligas


The Sonatello Speaker
A 58" Long 25:1 Tapered TL Using SB Acoutics Drivers : 8-inch woofer (SB23NRXS45-8), 5-inch coated paper-cone midrange (SB15NRX30-8), and 1-inch dimple dome tweeter with neodymium magnet (SB29RDCN-C000-4)


The Crossover is Built into the Base

Built by Paul Kittinger


Fostex FE-207E Full Range Driver in a ML TL Enclosure with a Rear Port and Variable BSC Filter

Built by Philippe Grandsire


Fostex FE-206E Full Range Driver in a ML TL Enclosure

Built by Erich Hennig


Jordan JX92S OB over a Goldwood GW-1858 Tubular H Frame


The Crossover is Built into the Rear of the H Frame

Built by Brad Rice


Fostex FE-103E Full Range Driver on an OB and an Eminence Alpha 15A Woofer Mounted in a H Frame

Built by Graf Imhoof


Back Loaded Horns Using the Alpair 10 Full Range Driver

Front and Rear Mouth Versions

Built by Colin Topps


A Variety of Quarter-Wave Enclosure Designs Using Fostex and Lowther Full Range Drivers

Built by Daniel Advis


ML TQWT Using Fostex FE-164 Drivers

Built by Hubert Pellet


Two Metronomes Using Fostex FE-108EZ and Fostex F120A Full Range Drivers

Built by Jim Shearer


The Copper Tones Speaker
A CSS FR125 Full Range Driver in a ML TL Enclosure


The BSC is Built into the Base

Built by Paul Kittinger


Bob Brines' LT2000 ML TL Design with a Lowther DX4 Driver

Built by Toby Patton


A Folded Tapered Quarter Wave Pipe using the Fostex FE-167E Full Range Driver


Rear View

Built by Richard Goodland


Visaton FRS8 Full Range Drivers in Bipole Enclosures (Front and Back Views)

Built by Esaú Cardoso


The Marcato Speaker
A Pair of Usher 8945Ps in a 2-way MTM ML TL with a BG Neo3PDR Planar Tweeter


The Crossover is Built into the Base

Built by Paul Kittinger


SEAS Tweeter and RCF 8" Woofer in a Folded ML TQWT

Built by Aaron White


Alpair 10 Full Range Driver on an OB with an Eminence Alpha 15A Woofer in a H Frame

Built by Pete Menting


Fostex T90A Super Tweeter, Electrovoice SP12B Wide Range Driver, and Eminence Alpha 15A Woofer in an H Frame

Built by Bill LaDieu


Fostex FE-87E Full Range Driver and Eminence Alpha 15A Woofer on an OB

Built by Brad Rice


2 x Eminence Alpha 15A's, 5 1/2 " Seas Excel, and a Scanspeak Revelator on an OB

Built by Joseph Potgieter


Pioneer Model A11EC80-02F Driver in a TL

Built by Ed Hlywa


Aurousal's VS VirtualSource Floorstander

Available from Aurousal Ltd.


The cenTiLana Speaker
A Dayton RS180-4 Woofer, in a single-fold 60" long ML TL, with a Dayton RS52 dome Midrange and a Vifa XT19 Tweeter


The Crossover is Built into the Base

Built by Paul Kittinger


Open Baffle Design Using a Fostex FE-103E Full Range Driver and an Eminence Alpha 15A Woofer

Built by Dan Hatmaker


ML TQWT Using Fostex FE-164 Drivers

Built by Jack Ha


ML TQWT Using Dynaudio Drivers

Built by Hans van Rooij


Folded ML TQWT Using the Fostex FX120 Full Range Driver

Built by Martin Paul


Open Baffle Design Using a Fostex FE-108 Sigma Full Range Driver and an Eminence Alpha 15A Woofer


The Crossover

Built by Mike Rains


The canTiLena Speaker
An 8" SS22W/8857T00 Woofer, in a single-fold 77" long ML TL, with a Morel MDM55 Midrange and a Fountek NeoCD1.0 Ribbon Tweeter

Built by Paul Kittinger


ML TL Using SEAS H1212 Tweeter and a SEAS CA18RNX Woofer

Built by Peter Myers


Fostex FE-168EZ Sigma in a ML TL

Built by Rudy Vanclaire


Open Baffle Design Using a Supravox 215RTF Bicone Full Range Driver and two Eminence Alpha 15A Woofer Drivers


The Crossover and 45W Monoblock Amplifiers

Built by Vasile Carcei


The TuLines Speaker
A Pair of Dayton Loudspeaker RS180 Woofers, in separate ML TL's, with a Dayton RS52 midrange and a Fountek NeoCD3.0 Ribbon Tweeter


The Crossover is Built into the Base

Built by Paul Kittinger


ML TL Using a Jordan JX92S Full Range Driver

Built by Francesco Campedelli


ML TL Using a Hi-Vi B3N Full Range Driver

Built by Francesco Campedelli


Tapered TL Using a Visiton 120mm W100-S bass / mid and Elac DT28 Tweeter

Built by Carl Peake


Fostex FE-206E in a ML TL

Complete with name plate!

Built by Brent Frazee


Lowther DX2 in a ML TL

Phase Plug

Built by Torry Hægeland


ML TL Using the Great Plains Audio Altec 604-8H-II Driver

Owned by Stephæn. Designed by Jay Fisher and Pete Riggle, built by Pete Riggle and Stephæn.


Bob Brines' ML TL Design using the Fostex FE-167E Full Range Driver

Built by Franz Dorfmueller


Double Back Loaded Horn using the Fostex FE-126E Full Range Driver

Built by Scott Lindgren


Fostex FE-207E in a LP #9 Enclosure

Built by Hudson Miller


Back Loaded Horn using the Jordan JX92S Full Range Driver and a Super Tweeter

Built by Paul Norton


Mini MLTL HT Speaker using TB 4" Bamboo Driver

Built by Paul Norton


The Alicante Speaker
A Dayton Loudspeaker RS225 8-inch Woofer, in an 18:1 Tapered TL, with a Morel MDM55 Dome Midrange and a Vifa (Peerless Vline) XT19 Ring Radiator Tweeter


The Crossover is Built into the Base

Built by Paul Kittinger


ML TL's Using Scan Speak W21 8554's and 2905 9500 Tweeters in the Big Enclosure and Scan Speak 18W 8545's and Seas 27TDFC Tweeters in the Smaller Enclosure

Built by John Hageman


Fostex FE-167E in a ML TL

Built by Rob Flynn


MTM ML TL

Built by Jorge Omar


ML TL using the Fostex FE-206E Full Range Driver

Built by Christian Belgardt


ML TL using the Fostex FE-207E Full Range Driver

Built by Stephen Small


ML TQWT using a RCA LC1B Extended Range Coaxial and a Dynaudio T330 Esotar Tweeter

Built by Zoran Dimovski


ML TQWT using a Dynaudio 17WLQ Esotec and a Focal TC 90 TD 5 Tweeter

Built by Zoran Dimovski


CCS FR125 Full Range Drivers in a Bi Polar ML TQWT

Built by Pete Menting


A Peerless 831709 woofer in a ~12:1 "tapered" line with a LPG 50FA soft dome midrange and Eton 19SD-1 soft dome tweeter

Built by Paul Kittinger


Tangband W3-871S ML TQWT Home Theater System

Built by Yourane Ung


ML TQWT using a Lowther DX4 Full Range Driver

w/ Custom Phase Plugs

Built by Laurence Platt


Folded TQWT using a SEAS 6.5 mid/bass and Vifa Tweeter

Built by Dave Merrill


ML TL using the Fostex FE-207E Full Range Driver

Built by Ryan Bergmann


ML TQWT using the Tangband W4-657S Full Range Driver

Built by Paul Norton


Fostex FE-206E in a ML TQWT with a Variable BSC Circuit

Built by Jeremy MacLennan


Pioneer TS-A2510 in a Folded Transmission Line

Built by Pedro Leite


Fostex FE-127E in a Bass Reflex Enclosure and Fostex FE-83E in a Folded TL

Built by Jacques Cande


ML TL using the Fostex FE-206E Full Range Driver

Built by Artan Ymeri and Viktor Halili


Jordan JX92S in a Transmission Line Enclosure

Built by Steve Carlton


Fostex FX200 in a ML TL, Fostex FE-167E in a ML TQWT, and Radio Shack RS 1354 in a Folded ML TQWT

Built by Jeremy MacLennan


Home Theater Set-up Featuring a ML TL using the Fostex FE-206E Full Range Driver

Built by Ron Parsons


Folded ML TQWT using the Dai-ichi 8" Full Range Driver made in the Philippines

Built by Lerio Agner, Jr


ML TL using the Fostex FE-206E Full Range Driver

Built by Bob Schense


ML TL using the Jordan JX 92S Full Range Driver

Built by Stefano Billiani


ML TL using the Scan Speak 21W8554-00 Woofer and the Scan Speak 2905 9500 Tweeter

Built by John Hageman


Fostex FE-206E in a ML TL using a Behringer Ultra-Curve Pro DSP 8024

Built by Markku Myllyla


Fostex FE-206E in a ML TL


BSC Circuit Using Hand Wound 6 lb Air Core Inductor

Built by Leon Licer


Jordan JX92S in a ML TL

Built by Jay Fisher


Morel MW-144 and MDT-33 in a TL

Built by Tsvetan Taslakov


Fostex FX200 and FT17H Tweeter in a ML TL

Built by Bill LaDieu


Fostex FE-167E in a ML TL

Built by Scott Dunn


Fostex FE-168EZ in a ML TL

Built by Rolf Paloheimo


Lowther ML TL Using the PM2A Driver

Read about these in Scott Faller's TNT-Audio Review


Veracity ML TQWT using the G2 Ribbon Tweeter and SEAS W18EX Woofer

Built by Jim Salk


ML TL using the Supravox 215 BiCone Full Range Driver

Built by Jan Babic


ML TL using the Fostex FE-206E Full Range Driver

Built by Mike Howard


ML TL using the Lowther DX3 Full Range Driver (Recently Upgraded to a DX4)

Built by Verne Mattson


ML TL using Fostex FE-207E Full Range Driver

Built by Moray James


ML TL using the Vifa P21WO-39-08 Woofer and the Scan Speak 2905 9300 Tweeter

Built by John Hageman


ML TQWT using the Fostex FE-127E Full Range Driver

Built by Henk Koetzier


Mini ML TL using Vifa/Audax Drivers

Built by Mark Krawiec


ML TL using the Dayton 18" Woofer

Built by Allan Jones


ML TQWT using the Fostex FE-167E Full Range Driver

Built by Galin Lyubenov


Scan Speak 8554 TL

Built by Mark Krawiec


Vifa P17WG Tapered TL

Built by Raymond van Weeghel


ML TL using the Fostex FE-127E Full Range Driver

Built by Rolf Paloheimo


ML TL using the Fostex FX-200 Full Range Driver

Built by Allan Jones


Bob Brines' Fostex FE - 167E ML TL

Built by Bob Brines


ML TQWT using the Fostex FE-167 Full Range Driver

Built by Alain


ML TQWT using the Fostex FE-164 Full Range Driver

Built by Johari Yip


ML TQWT using the Fostex FE-164 Full Range Driver

Built by Thad Aerts


ML TQWT using the Lowther EX4 Full Range Driver

Built by Martyn Redwood


The Peerless Pipes

Built by Bob Brines



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