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Re: KEF 105.2s are bright/harsh?? I want smooth speakers! Recommendations?? Anyone heard Rogers LS5/9? Other advice???

Posted by ColinR (A) on March 28, 2007 at 08:26:58

In Reply to: KEF 105.2s are bright/harsh?? I want smooth speakers! Recommendations?? Anyone heard Rogers LS5/9? Other advice??? posted by Mr Blue Sky on March 27, 2007 at 15:08:48:

Why would a couple of Audax units 18db/octave slopes be any better than three KEF with 24dB/octave slopes?

The problem was probably caused by your amplification.

T52’s in both Meridian and KEF loudspeakers have an age related problem where the voice coil splits into two or more sections giving a tizzy bright presentation, then it blows.

If you use under-powered amplification the Joule heating caused by the square waves induced in either soft (valve) or hard (ss) clipping will exacerbate the problem.

350w is better than 25w in this case (and the Cantata and Ref 103).

The impedance curve is a bit of a witch in several places btw.

Now you could either rebuilt the T52’s or replace them with something like a Raven ribbon.

If you want additional speakers to play with consider Mordaunt Short MS727 or MS737 – mine are pictured here

http://www.soundfountain.com/amb/ribbon.html

half-way down the page.

If you still don’t like them and as you already have Volt bass units, build a design often compared to Quad ELS 57s the Decca-Volt!

The MS727 and MS737 do come with a health wealth warning.

Health they like being driven by big amplifiers so, although my Quad 520’s, 606’s and Crowns will shake the house.

The very big (four-man lift) >500W Krell is quite a useable option.

Wealth warning like many KEF based designs, the MS’s are liked by ePrey pimps for speaker stripping.

The T27 is spitty and harsh without an aB crossover section, as is the T33mk1 (a KEF knock-off of a Peerless design.

The Ferrofluidised T33mkII and Aluminium varient in the 107 are just plain horrible like most Uni-skew, but they're playing to a modern mass market.

• .. I know nothing about KEF loudspeakers ;o}.   (Open in New Window)

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