"A single curve, drawn in the manner of the curve of prices of cotton, describes all that the ear can possibly hear as the result of the most complicated musical performance.... That to my mind is a wonderful proof of the potency of mathematics." Lord Kelvin

Acoustica.org.uk is basically a scratch-pad, a useful-pot to keep things in. It's mostly about audio engineering with a DIY flavour, salted with other odd things found interesting. Just browse at will through the sections on the left; and feel free to send comments, requests, case studies and the title deeds to spare desert islands to martin.
November 2013 update: A short but necessary history of UK Mains plugtop fuses.

Otherwise you could be replacing the foam surrounds on your Impulse H1, H2 and Ta'us bass drivers. Or you could build your own NAPSC alternative or read some minor updates to the notes on using 3-pin regulators.

More to come on useful capacitor lifespan; on low-voltage voltage regulation; and on modifying Naim's Line stages for better gain /noise structure...and a more usable range on the volume knob. Ah yes, and R1 stator replacement!

Fury R1!
...meanwhile we're out to play

© the twisted pair 2000-2013: This page is best viewed with the Lee 'Scratch' Perry boxed set rumbling away close by

Latest updates:

  • 24.03.13: Impulse H1/H2/Ta'us bass driver surround replacement page added
  • 20.06.12: NAPSC plug info added
  • 20.04.10: Using 3-pin regs part 4 added.
  • 25.02.10. Speaker cable page added; Impulse page updated
  • 0.01.10: HNY
  • STReg page added.
  • 23.11.08: Teddyreg page added.
  • 8.03.08: DPA pages updated with new reviews.
  • 23.02.08: 3pin regs page 3 and 27r+47uF filter pages added.
  • 01.07.07: Deltec pages - reviews considerably expanded.
  • 09.06.07: Deltec pages added.
  • 04.06.07: Naim amp bias page added.
  • 26.04.07: Ads & links pages overhauled
  • 08.02.07: Ads page added
  • 2.01.07: A few minor typos fixed.
  • 7.10.06: 3-pin regs pages added.
  • 30.09.06: SMPS for Naim preamps page added.
  • 19.07.06: Impulse Speakers page updated - cyberfi Taus review added
  • 17.06.06: IMpulse Speakers page updated - thanks to Brian Taylor.
  • 12.06.06: PFM Fleas first PCB batch sold out.
  • 06.04.06: PFM Flea page updated with build manual and PCB info.
  • 06.01.06: Planet mods page updated.
  • 03.01.06: CD3.5 mods page updated.
  • 20.12.05: No more yellow! - for an even plainer look.
  • 4.12.05: H6 rebuildpage added; CD3.5 mods pages updated again
  • 7.10.05: Cd3.5 mods pages updated.
  • 28.08.05: Rega Planet page updated.
  • 29.06.05: mains noise and mains filtering pages updated.
  • 29-30.05.05: Naim pre-amp mods bible, links and Impulse brochure pages added; components page links fixed; Lali review added (25.06.05)
  • 12.02.05: Naim PSU mds, components and suppliers pages added - many thanks to Ced.
  • 23.01.05: Impulse page updated - thanks Rob Holt and Jon Larsen!
  • 26.09.04: 'Naim CD3.5: other mods' page added;
  • 12.08.04: Nait2 line level input page added; Links page finally updated.
  • 05.08.04: 'Impulse' pages added and updated.
  • 22.06.04: 'Mains filters and hifi' page updated.
  • 29.04.04: 'about conservatories' and 'mains regeneration' pages added; Nait2 mods updated.
  • 25.04.04: 'Speaker positioning: practical' page added.
  • 14.04.04: Ugly green default hit counter added out of curiousity.
  • 02.02.04: Finally! an update! Nait2 page added; links page updated.
  • 09.07.03: Naim page added; links page updated; bits and pieces fixed.
  • 04.09.02: Earthing page added with links.
  • 01.09.02: CD63 tweaks updated, adding a few things we forgot; hrefs across the site tweaked to load faster, and a change of colour.
  • 10.08.02: Mains&impedance and conversions pages added; Power Quality primer link added - and the links fixed so they pop up in new windows.
  • 05.08.02: A Quicktime movie added - see the 'mains-borne noise' page.
  • 03.08.02: Links pruned; the CD63 tweaks expanded; More Stuff added - see the 'mains-borne noise' page.
  • 30.12.01: CD63 tweaks updated with diagrams & text expanded - thanks Andy.
  • 14-20.12.01: Gosh, it's been a while. Links relinked; tweak pages tweaked; airproofing, speaker positioning, glass and mains pages added; almost looks like a website now.
  • 14.07.01: Rega diagrams added, links updated
  • 28.06.01: Rega counterweight page added, with a few diagrams to follow....and a general site tidy-up
  • 21.02.01: Flutter echo: the original forum thread added
  • 10.10.00: Tweaks page lashed together; links updated
  • 30.09.00: First post; world domination secured

    © the twisted pair 2000-2004: This page is best viewed with the Lee 'Scratch' Perry boxed set rumbling away close by