+ Reply to Thread
Page 34 of 34 FirstFirst ... 24323334
Results 331 to 338 of 338

Thread: Renovation of Celestion 66 Studio Monitors

  1. #331
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 21,983
    I'm Martin.

    Default

    Quote Originally Posted by rodthebod View Post

    ). I always think if a speaker can paint an aural picture where the cabinets seem to disappear things are working properly.
    .
    Sounds like you are on the right track if that's happening.
    Martin



    Current Lash Up:

    Technics SLP1200 CD Player * NVA P90SA passive pre / Krell KSA50S Power amp * JM Lab Electra 926 loudspeakers *


    'This is the sort of music I'd be listening to if I was going shopping for a training bra.'

  2. #332
    Join Date: Nov 2016

    Location: Malta

    Posts: 47
    I'm Rod.

    Default New battery powered digital front end to help with crossover improvements

    Been a while since my last posting, just to keep you updated on progress I've been listening to the 66's with the crossovers externally mounted tri-wired to the drivers and the original wiring which went to the terminals inside the cabs to the Leak TL12+ power amps. I've not touched the components on the actual crossovers yet, all original apart from taking out some of the HF (brown coated electrolytic cans) caps to bering the values closer to what they should be (6 and 4uf) These caps were the worst effected by age being way over tolerance eg. 1.5uf measuring 4uf!.

    I've left the speakers so I could to get used to them since building new cabinets and to be honest because they sound so good. I have all the new components ready as per Ken's spec (Alcaps/Mundorf e-caps/Ansars for the HF and strapping the 72uf midrange by 5% - see previous postings)

    I would have started surgery sooner had it been for the fact I had a bit of an enjoyable revelation when visiting Victor Angelo (of Terminator arm/Salvation TT fame) place a few weeks ago. He was using a digital front end using a custom media PC powered by a good DC linear power supply and an external DAC which was based on a Texas Instruments PCM5102 DAC (battery powered) and it sounded very good indeed playing CD redbook ripped recordings. So I've been on a mission for the past weeks to get a decent DAC and digital source. Vic has all his kit listed on his web site TransFi.

    My Macbook Pro has a decent Cirrus logic DAC fitted and using Audirvana bit perfect output it has always sounded OK but nothing special driving a passive preamp to my efficient Leak TL12+'s power amps. I took the plunge and got a Chord Mojo DAC having read so many good things about their products. It's another league completely to the Macbook DAC way more musical and far more detailed but it's the presentation that wins me over. I read about PC's and laptops being noisey especially with switch mode power supplies etc. and the fact Vic was using a good LPS certainly proved their worth when listening.

    So having read about the excellent dedicated audiophile software available tailored for the Pi - Moode/Rune/Volumio I wanted to try 'pure' battery power - no mains problems to worry about, and hear! What's the simplest solution......a very low power PC so I went for a raspberry Pi3 fitted with a Digi HAT spdif taking the digital signal direct from the I2s bus of the CPU (dedicated transformer and clocks with galvanic isolation). Hardwired the spdif from the PCB board bypassing the flimsy spdif connector then into a mini jack to the Chord Mojo. Powered the whole thing with a decent lithium-ion powerbank 5v battery and WOW!!! Once you've tweaked the configuration (I use Moode player) to everything highest possible quality you are in for a real treat, tracks become a real music feast - only having experienced on vinyl previously. I'm spending hours listening getting completely lost in time.....

    I tried a R core transformer driven linear 5v power supply to the Pi, it sounds good, but doesn't have the cleanness of sound and there is a slight noise behind everything. Trying high current LiPo batteries, as used in drones and model cars etc. seems to give more dynamics - you have to use at least 7v 2.5a output with a variable voltage regulator to give the 5v required for the Pi.
    Just thinking of a way to power the spdif board independently to see if that improves things further. You have to hear some of the high bitrate tracks 24/96+ and DSD - wonderful stuff.

    Anyway, I've gone off topic, but am now ready to start changing crossover components to hear the improvements, with my new front end this should be easier to tell how things change. BTW elevating the 66's by a good 12 inches really helps clean up the bass and makes the cabinets even more transparent - even though it does make them look even more imposing - thank goodness I have my own room.......
    Last edited by rodthebod; 24-04-2017 at 17:14.

  3. #333
    Join Date: Feb 2015

    Location: Glasgow

    Posts: 39
    I'm Richard.

    Default

    I hope it's ok to post here to let folks know that I am currently undertaking a Ditton 66 refurbishment of my own. I have upload loads of measurements graphs etc that may be of use to others. If you fancy checking it out here's the link. Your contributions would be most welcome .
    Main System: Mac Mini > Schiit Yggdrasil (USB.v5 & Analog.v2) > Yamaha A-S3000 > Tannoy Edinburgh Monitor Gold 12 / Celestion Ditton 66 > BK XXLS400 subs
    Headphone System: Mac Mini > Schiit Yggdrasil (USB.v5 & Analog.v2) > Schiit Mjolnir 2 / Schiit Jotunheim > Sennheiser HD800S / Sennheiser HD600

  4. #334
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 36,847
    I'm Geoff.

    Default

    Quote Originally Posted by ToTo Man View Post
    I hope it's ok to post here to let folks know that I am currently undertaking a Ditton 66 refurbishment of my own.
    Good idea.

  5. #335
    Join Date: Feb 2015

    Location: Glasgow

    Posts: 39
    I'm Richard.

    Default

    Has anyone tried the replacement HF2000 diaphragms being sold on eBay? (There are replacement MF500/MD500 diaphragms too). I'm wondering if these would iron out the ragged responses of some of the HF2000s I recently measured? I'd offer to be a guinea pig but I lack the fine motor skills required for a job like this.

    Being a 66 owner for many years and having already renovated a pair, I SHOULD know the answer to this, but I've never been absolutely certain whether the 66 was designed around an HF2000 with 4 ohm or 8 ohm nominal impedance. Can someone please put me out of my misery on this? What would a 4 ohm and 8 ohm HF2000 normally read on a DVM? I am aware of the rule of thumb: Impedance = DCR + 15%, which would put a 4 ohm nominal HF2000 at around 3.5 ohms DCR and an 8 ohm nominal HF2000 at around 7.0 ohms DCR. Thus I'm struggling to see where my HF2000s that measure between 4 and 5 ohms DCR fit into the picture?

    Also, at risk of revealing my distinct lack of EE knowledge, is it true that the HF2000 and MF500/MD500 are in wired in reverse polarity to each other? As the colour coding on the crossover wires matches the colour coding on the drivers terminals I just assumed all three drivers were connected in the same polarity?
    Last edited by ToTo Man; 19-07-2018 at 14:35.
    Main System: Mac Mini > Schiit Yggdrasil (USB.v5 & Analog.v2) > Yamaha A-S3000 > Tannoy Edinburgh Monitor Gold 12 / Celestion Ditton 66 > BK XXLS400 subs
    Headphone System: Mac Mini > Schiit Yggdrasil (USB.v5 & Analog.v2) > Schiit Mjolnir 2 / Schiit Jotunheim > Sennheiser HD800S / Sennheiser HD600

  6. #336
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 3,466
    I'm jamie.

    Default

    i bought when i had mine some supposedly rare red label hf2000 tweeters,when i recapped the crossovers i stuck them in and the top end was not as good as before,i checked my work on the crossovers and all was good,so i put the old tweeters back in and all the top end came back.

    a call to falcon acoustics confirmed that the red label ones were from another speaker originally,i forget which but the guy did say they were 4ohm and not 8.

    the reverse polarity is done at the crossover.so black wire still goes to the minus terminal etc.
    My System/ Yamaha NS1000M speakers ,Pioneer PLC-590,Sony TTS-8000 turntables,Pioneer PA-5000 and PMAT-1010 Tonearms,AT-ART 7 Cartridge,Denon HA-500 Head Amp, John Wood KT88 Valve Amp, Nakamichi ca5 pre amp,Sony X555ES CD Player,

  7. #337
    Join Date: Feb 2015

    Location: Glasgow

    Posts: 39
    I'm Richard.

    Default

    That's interesting. Way back on my very first pair of 66's I had to replace an HF2000 and I bought one with a DCR of 9.2 ohms and it was significantly quieter than the HF2000 in the other speaker which was around 4.5 ohms. I then bought an HF2000 that was 3.4 ohms DCR and it was louder than the 4.5 ohms DCR HF2000 in the other speaker. This seems to be the opposite of your experience.

    Out of interest, what would be the effect of reversing the polarity on the HF2000? Would the output at the crossover frequency between the MD500/HF2000 be stronger or weaker? The measurements of the last pair of 66's I renovated show a peak in the response around 5.2kHz. I wonder how much this is to do with the HF2000's raw response and how much of it is to do with the crossover polarity.
    Last edited by ToTo Man; 19-07-2018 at 17:10.
    Main System: Mac Mini > Schiit Yggdrasil (USB.v5 & Analog.v2) > Yamaha A-S3000 > Tannoy Edinburgh Monitor Gold 12 / Celestion Ditton 66 > BK XXLS400 subs
    Headphone System: Mac Mini > Schiit Yggdrasil (USB.v5 & Analog.v2) > Schiit Mjolnir 2 / Schiit Jotunheim > Sennheiser HD800S / Sennheiser HD600

  8. #338
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 3,466
    I'm jamie.

    Default

    hi,
    ive replied to you on the other thread
    My System/ Yamaha NS1000M speakers ,Pioneer PLC-590,Sony TTS-8000 turntables,Pioneer PA-5000 and PMAT-1010 Tonearms,AT-ART 7 Cartridge,Denon HA-500 Head Amp, John Wood KT88 Valve Amp, Nakamichi ca5 pre amp,Sony X555ES CD Player,

+ Reply to Thread
Page 34 of 34 FirstFirst ... 24323334



 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •