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2010 News
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News 2008 (pdf file) News 2007 (pdf file) News 2006 (pdf file) |
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February 2010Further to numerous enquiries regarding the restoration work Isonoe performs on Bozak CMA 10-2-DL-series and UREi 1620 mixer-preamplifiers, a PDF has been compiled, illustrating a Bozak CMA 10-2-DLC built from the ground up with spare parts. The mixer incorporates numerous upgrades and has the best measured performance we have ever seen on any Bozak unit by far. Rather than just rely on measurements, a listening shootout was held at our demo room between this mixer and a Bozak DL rebuilt a few years back. The difference was not subtle; the new DLC sounded tighter and more refined to all that were present, to the point where the owner of the older mixer has now ordered his one to be upgraded to the same specification. You can download the PDF here: Isonoe Bozak CMA PDF |
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2009 News |
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Autumn 2009Isonoe Isolation Feet Nominated as Finalists in 2009 Awards and Awarded "Best Buy" Status by Hi-Fi Choice |
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Isonoe Isolation Feet have been nominated as finalists in Hi-Fi Choice's 2009 awards and are reviewed in the November 2009 issue. The review concludes: "An efficient product that gives real isolation and as such is suited to highly microphonic kit like turntables".
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Upgraded LRPS Now Available in 1U format |
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After many requests from clients, the Isonoe Linear-Regulated Power Supply (LRPS) is now available in a 1U format. Its circuitry and filtering is the same as the previous version, but it is now wired with Teflon-insulated / silver-plated wire and has a 115 / 230v selector as standard. Information on the new LRPS can be seen here: |
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Mr Scruff goes Global with Isonoe EQ. |
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Mr Scruff's Isonoe EQ has become a permanent part of his touring equipment arsenal, visiting all parts of the globe. Mr Scruff can be seen using the EQ in this clip - it's the unit with the silver knobs at the top of his rack (copyright Static TV): |
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Theo Parrish buys LRPS. |
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Theo Parrish wanted an alternative to packing a selection of mixer power supplies for different continents when touring, and contacted Isonoe to see if a low-ripple / low-noise power supply could be made for his mixer that could change voltage at the turn of a switch. A custom version of our famed Isonoe Linear-Regulated Power Supply was made and Theo has been touring with it ever since. Visit Theo's website: http://www.myspace.com/soundsignature |
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David Mancuso Tests Isonoe Feet at The Loft Party in London |
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Fitting upgrades to rare and expensive turntables that have been used for many years by legendary NYC Loft Party host and musical selector David Mancuso is not something you undertake lightly. The Lucky Cloud Sound System would not entertain modifying David's Koetsu arm / cartridge-equipped SL110 turntables without his full approval, so an A/B test, comparing one turntable fitted with Isonoe Feet against one without was arranged for David to conduct. When turntables were compared, not only did everyone present witness feedback resistance on the converted turntable improve to the point whereby it could be played far louder than the unconverted turntable, but David also remarked that sound quality on the converted turntable had improved across the board. David requested that both turntables be fitted with Isonoe Feet. |
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July 2009: Custom Page Update |
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The original data shown for the Bozak CMA 10-2-DLA with Isonoe LRPS was taken from a prototype power supply we made. We have since taken measurements from production versions, fitted to a variety of CMA 10-series models, and found that the noise figures are better than originally quoted. The overall SN ratio of CMA 10-2-DL-series, from Phono preamp to Master output, improves from 67dB to 94dB (20hz to 20khz - A weighted). FFT plots show that the most audible mains harmonics at 100hz and above drop by as much as 60dB when an Isonoe LRPS is installed. Many examples of DL-series have now been fitted with the LRPS, with the improvement being the same on each example, whether DL or DLA-type. |
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Ministry of Sound Upgrade all Rooms to Mk2 Silicone Feet |
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Having been one of the first clubs to install Isonoe Isolation Feet back in 2006, Isonoe visited Ministry of Sound and upgraded the turntables in all rooms to Mk2 silicone feet. We are pleased to report that none of the rings on their isolation feet was damaged in any way, and they showed virtually no signs of ageing.
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Rare Rosner Bozak brought to Isonoe for Servicing |
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Joel Martin of Quiet Village brought a rare silver Bozak CMA 10-2-DL to us. The mixer is the earliest we've seen, using the BC107/BC177 transistor combination and possessing no effects loop. Fortunately for Joel, it appears that the mixer was retrofitted by Rosner Sound in 1980, with ALPS RK40 pots, a Grayhill rotary cue switch and new RCA jacks. Unfortunately, subsequent engineers who worked on the mixer do not appear to have been of the same calibre, and it was non-functional, with numerous faults, many of which were unusual and due to incorrect repairs. Isonoe restored the mixer to factory specification. The mixer has been tested via a distortion analyser and performs flawlessly. It appears to sound slightly different from the later DL and DLA-onwards models, although measures identically in terms of noise floor. Note that the mixer has not been over-restored, so as to preserve its patina.
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Stop Press: February 2009 |
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A new Custom Equipment page has been added to the site. First available item is the Linear-Regulated Power Supply. It is built to order and available in versions to suit the UREi 1620 and Bozak CMA10-2-DL / DLA / DLO / DLS / DLC mixer-preamplifiers. The low-noise / low-ripple power supply possesses many times the filtering of the standard power supplies, eradicating the customary hum one associates with these mixers, making them suitable for use with high-efficiency horn-loaded speakers such as the Klipschorn.You can see specifications and FFT plots on the new Custom Equipment page.
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2008 News |
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Mr Scruff takes Isonoe Equalisers to Matter |
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| As part of his nationwide tour, Mr Scruff took over the main room at London's prestigious new Matter nightclub in the O2 arena. Two different versions of Isonoe equaliser were used, with one wired as an insert and one as a master. Mr Scruff and his engineer realised a considerable improvement in sound quality by inserting the Isonoe EQ at the mix buss, bypassing the mixer's IC-based class A/B output - using the EQ's powerful, low-impedance, discrete class A balanced-output stage as a master to drive the main system. All the engineers present commented on how smooth and flattering the pure class A topologies sounded. The Isonoe equalisers are of completely original design, contain no integrated circuits whatsoever, and possess a genuine signal-to-noise ratio of over 100dB. | ||||
Harvey and Thirty Nine Hotel install custom Isonoe Power Supplies |
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Due to the Klipschorn speakers used at Thirty Nine Hotel being around 14-18 dB more efficient than conventional speakers, any noise or hum present in the signal chain is amplified to a far greater degree than with a conventional speaker. On account of this Harvey and the management @ Thirty Hotel decided to lower their UREi 1620's noise floor by having a custom-made linear-regulated PSU designed and fitted by Isonoe. Considering there were no items on the market that exactly met the criteria desired by Harvey, a custom-made linear-regulated power supply was also built for Thirty Nine Hotel's Technics turntables, putting 3 PSUs into one convenient 2U rack: |
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Isonoe's MD was flown over to Hawaii to oversee the installation of the bespoke hardware: |
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Matter equips all rooms with Custom Isonoe Feet |
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The audio installation at Matter is on an unprecedented scale and is said to be one of the most powerful, if not the most powerful sound systems in any UK nightclub. As such, the turntables need optimum isolation from vibration. At a recent gig, whilst Jazzanova were DJ-ing, such was the vibration generated by the rig, empty drinks cartons could be seen 'dancing' around in the DJ booth... However, no feedback was heard and the sound remained unaffected. Visit Matter's site here: http://www.matterlondon.com
Cosmo has a complete refit performed on her Bozak CMA10-2-DL.Being the first mixer she purchased when living in New York many years ago, Cosmo was adamant that her much-cherished mixer be refurbished by the best. After much scrutiny and testimonies from other clients, Isonoe was employed to perform a full rebuild to the mixer, including the installation of an external power supply, new ALPS pots, ELNA RJH capacitors and recalibration. The decision was also made to bypass the Balance controls - one that yielded benefits in terms of noise over a standard mixer. http://myspace.com/bitchesbrewcosmo |
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Many new products are in the pipeline for 2009 - watch this space! |
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