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DIY SPEAKERS

 One DIY'er Tells His Story:

We built FOUR pairs

Link to: GALLERY OF ELSINORE BUILDS

The 'Elsinore' Loudspeaker Project - © Joe Rasmussen 2006-23

THREE VERSIONS:

"ULD" - For those who can afford the ultimate Elsinore System.      

"MFC" - For those who are on a budget, do not hesitate to build it.

 "NRX" - For those who have discontinued NRX Fibre Cone drivers.

Scroll down to see all three Crossovers and Construction Chapters

TWO-WAY SPEAKERS & CENTRE CHANNEL USE:

Hamlet Mk6 Speakers

Elsinore Mk6 "ULD" with Purifi Drivers

ELSINORE MARK 6

A "Current Drive" Compatible Loudspeaker

Now Three Versions: "MFC" "NRX" and "ULD"

All 3 Crossovers below, all use same Box Design and minor different Port Lengths.

Important:

REQUIRES A WAVEGUIDE: AVAILABLE USD $150 or AUD $190 INCLUDES AIR MAIL

PAYPAL LINK (ACCEPTS CREDIT CARDS) HERE: AUD $190

NOTE: IN STOCK

(Use drop-down menu if selecting to pay USD $150)

NEW CONSTRUCTORS: PLEASE NOTE NEW ALUMINIUM WAVEGUIDE DESIGN

NOTE CHANGES TO THE FRONT PANEL FROM EARLIER VERSIONS

Arguably The World's Largest Online Speaker Project - 100 Plus Pages (if printed out)

"Today I got those speakers to play just wonderful... deep, fast bass, firm soundstage, sparkling clear highs, a monitor with a big heart! A world class speaker - doing everything right, no colouration, no need for a sub!" "To my opinion the performance is now on par or even better [than] the Avalon Eidolon." Hans Hammerbauer, Switzerland

"Finished the project. I'm absolutely blown away, these things sound incredible. I hope more people use this design." PoorSound (www.diyaudio.com), Brandon, Canada

"Do it... listen to them and build them, you won't regret it... They do everything I could want them to do (and plenty of things my neighbours don't want them to do) and without any of the disadvantages that some speakers force you to live with (eg, low sensitivity, low impedances, only suit one specific genre of music etc). The Elsinores let you have your cake AND eat it too... I'm also absolutely blown away, these things sound incredible. I hope more people use this design." Rob Davies, Qld, Australia

NO COMMERCIAL LOUDSPEAKER MEASURES LIKE THIS:

Flat Frequency Response

Ultra-Flat Impedance

Ultra-Flat Current Phase Angle

EASIEST LOUDSPEAKER TO DRIVE - EVER ?

ELSINORE Mark 6 PROJECT KITS

Kit of Parts, Drivers & Built Crossovers (you build boxes) $3500 negotiable opptions

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Chapters so far:

1. Why Elsinore chosen as the name?   (Shakespeare, Hamlet, 1964)

2. Preliminary Design Details   (Speaker Design Issues)

3. Box Alignment - A Discussion   (Vented Alignment & Choices)

4. Construction Drawings   (Part 1: Construct Boxes)

5. Internal Box Wiring and Damping  (Part 2: Construct Boxes)

6. Construction Photos  

7. Gathering Acoustic & Z Data

8. Notes On Computer Modelling  - The theory is put into practice

9. The End Game - Final System Measurements of Mk2

10. Useful Links, Sources & Articles

11. FAQ - Please read this before sending me emails and questions - thank you

12. Alternative Peerless HDS 830875 Drivers

13. Photo Gallery - send in your own photos

14. Tweaking the Crossover  (Mark 1)

15. Peerless HDS Tweeter - Distortion Measurements - as used in Mark 2 & Mark 3

16. Dynamic Compression & Fletcher-Munson Curves - Elsinores and Ultra-Low Compression

17. The "Joe Rasmussen Approach to Crossover" - An Odyssey of Major Proportions. Come Along...

18. Upgrading Mark 1 & Mark 2 to Mk3  -  The Tweeter's new mounting changes for Mk3

19. The Renegade Tweeter Theory -  A Paradigm Shift - Why Tweeter's electrical phase must be reversed

20. Comments by Lynn Olson and others to come - Technical Comments by noteworthy individuals

21. Loudspeaker Power Response and Reverberant Sound Field - under construction

22. Static Testing of the Crossover - Using a basic impedance test, you can check it accurately

23. User Reviews - and more to come...

24. Non-Linear Thermal Distortion - Expanded April 2010 - A Solution Is Proposed

25. Time Alignment and the myth of Acoustic Centres - Do not waste a "Window of Opportunity"

  THIS DESIGN IS NOT PUBLIC DOMAIN - COMMERCIAL USE FORBIDDEN 

DESIGN ONLY GUARANTEED TO WORK IF IT IS FOLLOWED SPECIFICALLY - PLEASE READ FAQ PAGE

INTRODUCING THE ELSINORE LOUDSPEAKER "CHALLENGE"

NOTE THIS IS A LARGE SPEAKER PROJECT - PREVIOUS DIY EXPERIENCE IS ADVANTAGEOUS

AIM: TO DEVELOP A SPEAKER THAT WOULD COMMERCIALLY COST A$10,000 PLUS

The In-Room Total Bandwidth 25Hz to 20KHz with little need for a Sub-Woofer

Point-Source Effect from 400 Hertz up - Able To Produce Square Waves

The First "Current" and "Voltage" Compatible Loudspeaker

Minimum Phase and Ultra-Low Dynamic Compression

50Hz to 20Khz -/+ 2dB 2Pi Frequency Response

Inventive  Crossover Techniques Employed

Mid Drivers Run Effective Full Range

RENEGADE TWEETER THEORY

Eight Ohm - Easy to Drive

NEW DRIVERS NEEDS TO BE RECESSED:

OR:

The Port Length for all three Designs is now 100mm.

In all other respects the box design is the same.       

These are Mark 6 measurements:

Please Note: Computer modelled 15º Off Axis SPL (2Pi)

Actually Measured Impedance and Electrical Phase Angle

I/6th Octave RTA - "In-Room" Response 15º Off Axis

Peaks and Troughs below 1KHz are largely Room Modes

Smooth Response where room has less affect above 1KHz

THE CROSSOVER - Elsinore Mk6

NOTE: THERE ARE THREE VERSIONS

The standard recommended is the "MFC" version and the "ULD" version is for those who can afford the significantly more expensive drivers. The "NRX" uses a discontinued driver, but matches the performance of the "MFC" - do not use the NRX2 driver.

"MFC":

"ULD":

"NRX":

The SB17NRXC35-8 driver is now discontinued. The new drivers is SB17MFC35-8 and is the same driver except cone material mineral load polycone. The Crossover i the same with only two exception, values of L2 and R3 have been changed. You will see them with circles and values drawed around them.

Note: Crossover & Values of Components are Subject to Change

Drivers Data Sheets: SB Acoustics SB17NRXC35-8  (8) & Peerless/Scan-Speak "Discovery" Tweeter (2) or SB Acoustics SB17MFC35-8 (8)

Purifi "ULD" PT6.5W08-NFA-01

       The Peerless Tweeter also known as Scan-Speak Discovery D2608/91300

Filler required for Upgrading Mark 1 & 2 to Mark 6

Elsinore Castle, Kronborg,  and the southern beach.

I took this photo in 2002

Aerial shot of the mighty Kronborg Castle at Elsinore, Denmark

Total Design Responsibility, Joe Rasmussen of Custom Analogue Audio & JLTi

Part Financial Sponsor & Prototype Box Construction, Bernard Chambers of Sutherland

Sounding Boards, Brad Serhan of Orpheus Loudspeakers & Michael Lenehan of Lenehan Acoustics