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Thread: Mission 752 Freedom problems

  1. #1
    Join Date: Feb 2021

    Location: Lowestoft

    Posts: 15
    I'm Roger.

    Default Mission 752 Freedom problems

    Hi
    I've just got a set of 752F, wanted these ever since I first heard them over 20 years ago. My system up until now was Mission 733i's, Marantz CD63se KI and a old A&R Cambridge Arcam Alpha. On hooking up the 752F's i was quite disappointed at the harsh treble on high voices. I did't have this problem with the 733i's, any clues as to what i can do would be most appreciated.

  2. #2
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 30,977
    I'm Martin.

    Default

    could be any number of issues.

    If you're certain the speakers are not faulty or damaged I'd look to the amplifier. If it was fine with the 733i it should be fine driving the 752. But maybe not.
    Current Lash Up:

    *Audiolab 6000CDT* Topping E30 * Philips 22AH380 pre-amp * NAD C320BEE power amp * JM Lab Electra 926 *

  3. #3
    Join Date: Oct 2008

    Location: Glasgowshire

    Posts: 8,752
    I'm Gary.

    Default

    From memory of hearing the 752f’s back in the day, they were smooth but very clear...no treble harshness?
    Also the Freedom version moved from a mesh dome metal tweeter to a silk dome, so more reason for there not to be harsh treble?
    Enjoying hifi 'n stuff...

  4. #4
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 4,759
    I'm Lawrence.

    Default

    I've seen threads like this to round in circles and drive people nuts eg Mike's valve amp thread. What you need is a second (experienced) opinion. Given there we are with lockdown this is tricky for a while.

    As an alternative, I'd suggest getting a frequency generator app on your phone and plug it into the amp with a headphone to RCA lead. Run frequency sweeps on one speaker at a time. If you can't hear any obvious resonances then it's more likely to be a sensitivity to the speaker.

    Have you given then a few days to bed in? Sometimes they sound better after a while. Whether that's due to them being run in (if they've not been used) or your ears getting used to them is a controversial subject but either way it often helps.

    If there's nothing obvious then I'd suggest putting them to one side and keeping the old ones going until you're in a position to have visitors.


    Sent from my BKL-L09 using Tapatalk

  5. #5
    Join Date: Jan 2008

    Location: Norfolk, UK

    Posts: 5,823
    I'm BigBobJoylove.

    Default

    What speaker cables do you have Rog?

  6. #6
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 46,527
    I'm Geoff.

    Default

    I'd be inclined to try new capacitors and if the tweeters come apart, new ferrofluid.
    Repeat after me 'I must not look on ebay! I must not look on ebay! I must not look on ebay! I must not look on ebay!

  7. #7
    Join Date: Feb 2021

    Location: Lowestoft

    Posts: 15
    I'm Roger.

    Default

    They look in exceptional condition from what I can see

  8. #8
    Join Date: Feb 2021

    Location: Lowestoft

    Posts: 15
    I'm Roger.

    Default

    Quote Originally Posted by Gazjam View Post
    From memory of hearing the 752f’s back in the day, they were smooth but very clear...no treble harshness?
    Also the Freedom version moved from a mesh dome metal tweeter to a silk dome, so more reason for there not to be harsh treble?
    That is how I remember them, which is why I wanted them?

  9. #9
    Join Date: Feb 2021

    Location: Lowestoft

    Posts: 15
    I'm Roger.

    Default

    Quote Originally Posted by Macca View Post
    could be any number of issues.

    If you're certain the speakers are not faulty or damaged I'd look to the amplifier. If it was fine with the 733i it should be fine driving the 752. But maybe not.
    They look in exceptional condition from what I can see, I know that may not be the whole story. I think the amplifier is ok even thought it is over 30 years old.

  10. #10
    Join Date: Feb 2021

    Location: Lowestoft

    Posts: 15
    I'm Roger.

    Default

    Quote Originally Posted by Lawrence001 View Post
    I've seen threads like this to round in circles and drive people nuts eg Mike's valve amp thread. What you need is a second (experienced) opinion. Given there we are with lockdown this is tricky for a while.

    As an alternative, I'd suggest getting a frequency generator app on your phone and plug it into the amp with a headphone to RCA lead. Run frequency sweeps on one speaker at a time. If you can't hear any obvious resonances then it's more likely to be a sensitivity to the speaker.

    Have you given then a few days to bed in? Sometimes they sound better after a while. Whether that's due to them being run in (if they've not been used) or your ears getting used to them is a controversial subject but either way it often helps.

    If there's nothing obvious then I'd suggest putting them to one side and keeping the old ones going until you're in a position to have visitors.


    Sent from my BKL-L09 using Tapatalk
    I will try the Frequency test. As you say it's difficult at the moment to get another pair of ears

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