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Selecting replacement tweeters for speakers with no SPL rating?

Discussion in 'Speakers' started by Eastham, Sep 14, 2018.

  1. Eastham

    Eastham More Class-A than ever!

    Messages:
    2,195
    Location:
    North West UK
    A while ago I got a pair of Wharfedale Dovedale 3 but unfortunetely had a tweeter fail, the dome material cracked and the tweeter sound crackly and awful... So I set about finding a replacement, but this is the most information I could find on my speakers.

    3KafFrz.png

    Given it doesn't seem to show any 1w 1m SPL level other than "Zero level" I decided to go with a pair of tweeters rated at a SPL of 90DB (Monacor DT-140's) given I feel that these Dovedales are pretty efficient. It was recently suggested to me that the Dovedales have a SPL rating of 84DB since 14 + 70 = 84DB, no idea how he came to this conclusion but I'm considering building a L-Pad to bring these tweeters down to a SPL of 84DB but using my amplifiers tone controls, turnover at 5KHz which is the crossover point of the tweeter and mid range and set the tone control at -3 which should give me about a 6DB drop, doing this made the speakers sound kinda lacking in high end.

    So I was wondering if anyone had any advice for me as to finding what the SPL of my speakers is.
     

     

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  2. toddalin

    toddalin Super Member

    Messages:
    2,327
    Hard to read but it looks to me like they measured at 5 watts. So 1 watt is 7 dB less than displayed and you can figure the level from the 70 dB reference point. Using the mic distance, you can also calculate the volume at 1 meter.
     
  3. Eastham

    Eastham More Class-A than ever!

    Messages:
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    Location:
    North West UK
    I think I understand how he came to the conclusion, the SPL of 70 plus the 14DB ish on the graph giving 84DB, I made a pair of L-Pads to drop each tweeter 6DB, 4 ohm in parallel and a 2 ohm in series. No more harshness at high volumes! I guess they sound kinda muddy at low volumes because I was so used to the overdriven highs.
     
  4. r sinclair

    r sinclair New Member

    Messages:
    2
    HI, I run a pair of Dovedale 3's and have done for years, cracking speakers, i do have a couple of original tweeters, which i have repaired, i will be keeping as a spare. common on these the aluminium coil tails break near the purple dome. i managed o solder some new tails, they work perfectly. i did in fact come accross you on this forum while searching TRITON 3 info, which i use as my main speakers, tho i have modified these to suit myself. I have a triton 2 and a triton 3 pair, which are keepers, and sound great to my ears, tho' not standard anymore, do sound wonderful.. 20181009_175812.jpg 20181010_200235.jpg 20181010_200248.jpg 20181010_200416.jpg
     

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    Last edited by a moderator: Oct 18, 2018
    Eastham likes this.
  5. Eastham

    Eastham More Class-A than ever!

    Messages:
    2,195
    Location:
    North West UK
    Nice, I loved my Triton 3's wish I never gave them up. [Mod Edit]

    On the topic at hand I did a little more tweaking and removed the L-Pads, the 90DB tweeters are actually lower than the originals which seem to be 92DB SPL. After playing my Dovedales with a L-Pads in a correct setting The lack of highs was very noticeable and being placed correctly they sound much better without the L-Pads obviously.
     
    Last edited by a moderator: Oct 18, 2018

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