You will know better on what to tweak (if to tweak) the more you listen while the capacitors run longer and you are finishing with the build details. I saw the curves for the Denton in the link you provided, they are on axis, but I was mostly wondering how it holds for lateral HF spread in the top octave because soft dome on a wide baffle.
Sorry for the late reply, been enjoying Mez too much! 🙂
Regarding the Wharfedale Denton 85 measurements (and interestingly, there are two different versions of the review 'out there', one without the following tweak), Noel Keywood did say there was a measured treble spike that could be flattened with the addition of a 1ohm resistor applied to the treble bi-wire terminals instead of the wire link. I did this and it did balance a slight perceived treble peak nicely in my system at the time. However, it didn't play so well with Mez inserted into the system. I removed this 1ohm resistor and the music has regained it's natural balance top to bottom, and treble has its natural sparkle back again.
Really enjoying it, and I imagine further slight improvements will be had by replacing the super cheap test input wiring, and I may decrease the current setting resistors from 7.5ohms to 6.8ohms or even 6.2ohms, as the chassis only gets barely past room temperature as it is.
Peter Comeau the designer must have intended an on axis bump to somewhat offset the off axis roll off rate in terms of HF power response
I looked it up and the only other curves I could find are from a YouTuber (Joe N Tell). They look smoother than Keywood's take, more of an HF plateau than a peak
That’s interesting to see, thanks. Yes looks flatter here. There’s definitely a weakness in the treble unit as it sounds balanced, but occasionally a vocal or violin solo will make you wince as it sounds sharp/piercing momentarily. Probably less of a frequency response issue and more likely a physical resonance that briefly colours things. But overall I still love them, and they’re playing very well subjectively with the TT2 dac, DCB1 Mez and Quad 606 in my bedroom-based nearfield system. Due to illness I don’t have the luxery of my own house, but one day I hope things will look up and I can setup my system in a lounge environment and finally be able to experience what larger / better speakers can do etc.
Wishes for things to turn better. Keep us posted about your Mezmerize when in final form.
Mission 770 is another redesign of a British classic to be launched. It could also prove interesting in a larger space.
Mission 770 is another redesign of a British classic to be launched. It could also prove interesting in a larger space.
Wow, there's a blast from the past! The Wharfedale Lintons look rather interesting too:
https://www.wharfedale.co.uk/linton-heritage/
https://www.wharfedale.co.uk/linton-heritage/
I have trouble on wiring.
Output +/-and GND are shorted.
I am suspecting that 6 of 2sk170bl are fake.
7 is straight so.
Output +/-and GND are shorted.
I am suspecting that 6 of 2sk170bl are fake.
7 is straight so.
Channel outputs are meant to be shorted at GND by the output relay since double sided Mez boards when not activated i.e. its the muting function during delay and power off
For all DCB1 versions i.e. Mezmerize, Hypnotize, on any board issue through the years, you should use 15+15 VAC secondaries four terminal transformer. Wired in series like in your right side sketch. CT is point 2. Points 1,3 are AC. There are also internally pre-arranged three terminal 30V (15-0-15) transformers with just one CT wire exit but the four terminal discrete secondaries type is far more commonly available.
