ARTISAN™ RIBBON-Speakers and Kit's
Super High Definition Speakers
RIBBON SPEAKER DIY PROJECT
DRAFT 1 10/6/2010 "Under Construction"
Hello Mr. Storey,
I have found your homepage over the fountek.com.au page and I am really Impressed. And I have some questions and a suggestion.
First the RAAL tweeters are simply perfect; I heard them in a German Speaker. But they are too expensive for me.
I like your Artisan HD260 Ribbon Speaker Kit, but I don't understand why the tweeter is so far away from the mid-woofers? I heard that it sound better if they come
closer together. Since a long time I and some other Germans wait for a bigger
brother of the HD260. We think that a MTM with two Peerless HDS 830875 and a
Fountek JP2.0MB/Neo CD2.0 or Focal TC90 TD5B would perform perfect. In addition a speaker like these would need a subwoofer for the deep bass but the mid and
high frequencies would extremely clear and strong. Maybe you like to develop a speaker like this?
RIBBON SPEAKER PROJECT CONCEPT DRAFT 1 10/6/2010
ARTISAN MODEL 457_V1 Crossover
and box design is based on
Artisan R880 (level 3) special edition
( woofer / tweeter /woofer ) box shape .
The inner baffle front has round 45 deg radius bevels placed above and below the ribbon tweeter to minimise the effect of cabinet diffraction and improve the vertical and horizontal
dispersion and widen the sound stage and imaging . ARTISAN MODEL 457
The bass mid drivers are mounted on the outer front top and bottom baffle . The outer front baffle is around 36mm thick to enable
acoustic offset front baffles for the bass mid and tweeter .
Why acoustic offset front baffles on a speaker enclosure see >>> http://stonessoundstudio.com.au/stone/acoustic_driver_offset.htm
ARTISAN MODEL 457 ( Version 1 )
Sensitivity 93.5db @ 1M
Frequency range 42Hz to 33Kz +/- 2db
Impedance 4 ohm Nominal
Crossover Frequency 1.8 KHz
Low pass Filter 12db /octave
High pass Filter 18db /octave
Dimensions 210 W x1150 H x 365 D #( outside )
Weight: 40kg each Fully Finished Weight may change with Box Timber material used
Bass Mid Peerless 830875 (Nomex) 6.5" x 2 Stones Level matched to crossover ,phase pulse tested , doped Cone
Tweeter Fountek JP3.0 Ribbon 3" x 1 Stones level matched to crossover , phase pulse tested
BOX CONSTRUCTION DRAFT 1 10/6/2010
SPEAKERS DRAFT 1 10/6/2010
PEERLESS 830875 6.5''
Peerless HDS-164 Nomex diaphragm, 33 mm coil, AL
The High Definition Sound (HDS) NOMEX Series offers highquality solutions for both multi-way speaker systems and vented box applications. Featuring "shorting rings" for low distortion and coils offering perfect linear compatibility with NOMEX cones, these audio transducers are characterized by their very open, very rich sound character.
FOUNTEK JP2.0 RIBBON TWEETER
Fountek ribbon tweeter 9.6cm2 ribbon silver aluminium faceplate
NeoCD2.0 ribbon tweeter is a high-performance
component which is probably the best choice to
building/upgrade your loudspeaker.
Super strong Neodymium magnet for high efficiency
Build-in impedance conversion transformer
Effective from 1,200Hz upwards due to the large diaphragm area and low self-resonance.
Thin enforced sandwich ribbon diaphragm
Low distortion factor, good power-handling capabilities, high linear impedance and amplitude frequency response and the broad frequency response range.
Flat impedance from 1,000 to 40,000Hz
Ribbon tweeters should always be used with a
Do not test without a capacitor.
RAAL 140-15D RIBBON TWEETER
It comes easily for the 140-15D to "fool" the human brain in such a way that, all of a sudden, makes everything sound right and just as it should. The brain has no option but to interpret that there are real living people playing real musical instruments, playing in the very room in which, a millisecond ago, contained nothing more than your stereo system. The sensation of hearing "natural" sound is overwhelming. The exact size of all the instruments and vocals, their perfect position within the sound stage, and the clarity of air between the instrument's positions are all instantly recognizable
PEERLESS 830883 6.5''
Peerless HDS-180 EXCLUSIVE Nomex diaphragm, 33 mm coil, AL, CU, LS, Phase plug
This High Definition Sound (HDS) line of products push the performance limits of Mid bass audio transducers in a range of sizes - from the standard 205mm (8-inch) model, down to the very small 106mm (4-inch) model. Feature-rich and utilizing copper for the lowest distortion possible, the high-end HDS Exclusive Series takes maximum advantage of over 80 years of R&D experience to help systems designers build the world's best audio products
Movie > Running in the speakers at Stones Sound Studio Laboratory STONES TEST EQUIPMENT > Loudspeaker System & Driver Measurements
The Peerless 830883 6.5''
speakers are wired in series /parallel to an
amplifier and driven by a 20 Hz sine wave
for around 8 hours before any measurements
are carried out . Running in the drivers helps free up the new surround , spider and lead out wires and also reduces the resonance frequency and enables changes in
driver mechanical compliance to that of a "real world working speaker " .Running in the drivers insures more accurate frequency Impedance and '' Thiele/Small"
electromechanical parameters that define the specified low frequency performance of a loudspeaker driver result in more accurate modelling of the crossover and
enclosure design .Running in the drivers in also aids listening evaluations and improves the speakers bass mid depth and detail
SPEAKER PLOTS 830875 DRAFT 1 10/6/2010
DIY RIBBON SPEAKER KIT ( ALL COMPONENTS ) DRAFT 1 10/6/2010
" the great white shark "
Kit is supplied with
Russell's hand built and tested crossover boards hardwired with bi wire speaker terminal plate and all internal cable , 4 x hand doped and matched
( 6" bass/mid ) drivers 2x Crossover Boards fully finished
Speaker Kit V1 Features :
Peerless 830875-SS 6.5" LMS Analyser matched in pairs , drivers cone doped to lower distortion using FFT vibration Analyser
,silver soldered terminals
Option 1 Fountek JP3.0 3" True Ribbon tweeter with matching transformer , QC Phase , pulse tested , in matched pairs,
Version1 Crossover V1 & Enclosure V1 design Kit"
Speaker Kit V2
Option 2 JP2.0 5" True Ribbon tweeter with matching transformer , QC Phase , pulse tested , in matched pairs "sold with Version2
Crossover V2 & Enclosure V2 design Kit "
Speaker Kit V3
Option 3 RAAL 140-15D 6" True Ribbon tweeter with matching transformer , QC Phase , pulse tested , in matched pairs"
sold with Version2 Crossover V3 & Enclosure V3 design Kit"
SCR-SOLEN Fast cap 400 V DC or
Mundorf M cap supreme 800V or Silver in oil 800V
Resistors Mundorf Non Inductive Resistors 10W
Inductor Solen , Stones LA
Speaker Terminal Plate twin 4mm
Crossover Board ,fully tested with speakers connected on the LMS Loudspeaker Analyser
KIT PRICE : $ POA # NO SOLDERING REQUIRED
CROSSOVER and ENCLOSURE DESIGN DRAFT 1 10/6/2010
Crossovers are designed and developed by importing the actual
driver SPL & IMP ( frequency impedance and phase ) measurements into
LEAP 5 and LspCAD Pro 5.25 loudspeaker analysis programs to enable the Crossover and Enclosure to be designed together .
Leap 5 Enclosure Shop 3D diffraction analysis is used in conjunction with the Box ( Actual Shape )(xyz) and size ratio HxDxW +
Front baffle shape & edge step (xyz) size + drivers (xyz) location on baffle + port (xyz) location are analysed for best performance .
However the cabinet and crossover react with one another so both have to be taken into account in a when designing a loudspeaker system.
The Speakers acoustic location in space and Crossover Phase coherency interact with one another and play a dramatic effect on how dynamic
and detailed speaker system can sound .Acoustical off setting drivers on the front baffle will reduce the demand on the crossover circuit to
correct time delay and phase errors ,thus Acoustical off setting drivers also reduces speakers distortion and enables a more realistic sound image
Phase linearity and minimum error is very important to enable good a sound stage , dynamics .increase dynamic range , reduce distortion ,improve 3d imaging and over all depth of field of sounds . Minimum Phase error is one of the most important functions of a good speaker design but is often
over looked as measuring true acoustic phase of speaker "in real time " not post computed is a can of worms even when you have very expensive
phase analysers instruments as ambient noise ( even a quiet air conditioner is a problem causing measurement errors !
Box ( enclosure ) standing waves , excited by cross modulation between Bass to Mid to Tweeter Woofer to tweeter ,B M T to port + driver to port
are taken into account in the enclosure design . Also modulation distortion created by internal box dimension ratio' , Internal bracing shape size location and the roll port location, Port size, Port air mass loading has the drivers at low and high power levels is also taken into account .
The use of multi layers of acoustic damping materials with different density properties are important in reducing standing waves and can and do
improve the sound quality radiated towards the listener .
Finally the speakers boxes are
assembled ,damping materials fitted , measured extensively and then a
listened to with high quality music to fine tune
the values of the crossover to enable not just good but excellent sound quality on any kind of program material .
Any of the Artisan DIY speaker KITS or Projects are designed to provide an easy load any kind of amplifier valve , Tube , Solid state , with power levels from 3 watt to 250W .
The program material used to evaluate the sound reproduction of these speakers involved the use of both a low cost $200 Mini Music System and then top High End equipment playing 2 Channel Music , CD ,DVD , Blu ray . High End Multi Channel Home theatre , TV , Movie and Music .
Fig A LEAP 5 3D Diffraction Analysis
FIG 1 ARTISAN MODEL 457_V1 Frequency Response Crossover 82db SPL @ 3.2M
FIG 2 ARTISAN MODEL 457_V1 Impedance Response Crossover ( with out Box)
FIG 3 ARTISAN MODEL 457_V1 Crossover Schematic Bass / Mid Network
FIG 4 ARTISAN MODEL 457_V1 Crossover Schematic Tweeter Network
FIG 5 ARTISAN MODEL 457_V1 SPL Frequency Response 93.5 db SPL with 2.83V @ 1 M (830875 x 2 Box Response )
To Be Continued >>>>>>>>>>>>>>>>>>>>>>>> With PLANS and CONSTRUCTION PHOTOS