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The 'Elsinore' Loudspeaker Project - © Joe Rasmussen 2006-7

September 2007 - Announcing Mk3

USER COMMENTS ARE BEING SOUGHT - PLEASE CONTACT ME

(Mk3 shown here)

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

Mini Review:  The Elsinores at The Audiophile Society of NSW

ELSINORE Mark 3 PROJECT KITS

Kit of Parts (you build boxes) $2000 - Usually 2 Weeks Delivery

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Chapters so far:

Preface: September 2007 Mark 3 Update - Read First...

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   (Construct Boxes) Now Updated for Mark 3 + new Cutting Sheets

5. Internal Box Wiring and Damping

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

  THIS DESIGN IS NOT PUBLIC DOMAIN - COMMERCIAL USE FORBIDDEN 

DESIGN ONLY GUARANTEED TO WORK IF WORK IF 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-Woofers

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

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

These are Mark 3 measurements:

Please Note: Computer modelled On Axis SPL (2Pi)

150 Hertz rise is "Proximity Effect" only - otherwise Response -/+ 1.5dB 50-20Khz

Please Note: Computer modelled Off Axis SPL (2Pi) - represents "Power Response"

(the hump at 150Hz is largely a measurement artefact than real life)

  For more measurements - click here 

THE CROSSOVER - Elsinore Mk3

Note: Crossover & Values of Components are Subject to Change - Date 21st September 2007

IMPORTANT: I ended up using 4.5 to 5uF total for C2, I specified nearest standard value as 4.7uF

For somewhat more energy in the 'presence region' - use 5.6uF

Drivers Data PDF Sheets: Peerless HDS 830875  (8) & Peerless HDS 810921 (2)

  Elsinore Mk2 onward uses Peerless HDS 830875 M/Bass & HDS 810921 Tweeter 

Elsinore Castle, Kronborg,  and the southern beach.

I took this photo in 2002

Aerial shot of the mighty Kronborg Castle at Elsinore, Denmark

Click Here for PDF of Map of the Castle and Moat

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

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

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