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Yamaha ns-690ii recap

Discussion in 'Yamaha' started by elasticus, Sep 9, 2018.

  1. elasticus

    elasticus Member

    Messages:
    70
    I have a set of 690ii's in beautiful original condition however they don't deliver enough bass.
    I am prepared to spend about $250US on capacitors if anybody can help me with a shopping list and where to buy. I would prefer capacitors that fit easily however I will consider anything.
    Also does anybody know if they are a good match for my Yamaha ca-1000
     

     

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  2. clinic-audio

    clinic-audio all on YAMAHA untill 1990

    Messages:
    2,178
    Location:
    France
    Hello

    I am not convinced that bass frequencies will come back after spend 250,00 usd

    I read everywhere people making recap without serious reason , just to replace old components , even if they still good

    If you want to know if your speakers are working the way they should , use a spectrum analyseur and you will know the answer immediately

    It is a very good idea to ask the question before to spend money for nothing
     
  3. Jpete9

    Jpete9 Active Member

    Messages:
    396
    Location:
    Melbourne, Australia
    I recapped mine and it helped with clarity, but not bass. These arent too bad for bass, put them against the wall for more bass?
     
    slimecity likes this.
  4. Guest125

    Guest125 Active Member

    Messages:
    353
    If you were to look at the owner's manual, you would see that they fall off the lower end output fairly quickly below about 70hz. Caps won't fix this. Driver and cabinet design is your issue.
     
    Last edited: Sep 9, 2018
    slimecity likes this.
  5. FrostEOne

    FrostEOne Active Member

    Messages:
    360
    Location:
    Southeastern Iowa
    Food for thought, save your recap bucks and add a sub instead.
    Yamaha makes a nice sub for under your recap price,
    Yamaha NS-SW100 10" 100 Watt Powered Subwoofer
    Driver: 10" cone • Dynamic power: 100 watts (5 ohms) • Output power: 50 watts (100 Hz, 5 ohms, 10%THD) • Frequency response: 25 Hz – 180 Hz • Advanced YST: Yes • Twisted Flare Port: Yes • Dimensions: 13.88"W x 13.88"H x 16.13"D
     
    Last edited: Sep 9, 2018
    onwardjames and captouch like this.
  6. elasticus

    elasticus Member

    Messages:
    70
    So would Yamaha just design these to be played loud. I wish I could change this as I love the look of them.
     

     

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  7. captouch

    captouch AK Subscriber Subscriber

    Messages:
    4,522
    Location:
    Bay Area, CA
    I had a pair - never thought they were too wimpy in bass, but it's true they were only designed to go so low.

    I second the sub recommendation if you want more bass.

    If you're still wanting to recap, just for peace of mind, you might use cheaper caps and see if any bass comes back. If it does, you could consider going higher end on the caps, but typically, higher end caps are lower uF values used for the tweeter and midrange drivers and the larger value caps used for the woofer are always electrolytic anyway due to the large values needed.
     
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  8. Guest125

    Guest125 Active Member

    Messages:
    353
    Inductors are used to roll off high frequency, caps to limit it's low frequency. You won't find caps being used on the woofer to limit it's low frequency. It won't help. Driver and tuned cabinet frequency is your limiting factor. The FS of driver limits you.
     
    Last edited: Sep 9, 2018
    mbz likes this.
  9. FrostEOne

    FrostEOne Active Member

    Messages:
    360
    Location:
    Southeastern Iowa
    Here's a crossover drawing that's easy to follow.
    [​IMG]
     
    mbz likes this.
  10. captouch

    captouch AK Subscriber Subscriber

    Messages:
    4,522
    Location:
    Bay Area, CA
    Thanks. I'm always eager to learn and this is a good opportunity.

    In the crossover schematic above, what is the 94uF (2 x 47uF in parallel) used for in the woofer circuit? I can see the signal doesn't go through it like it seems to for the mid (C2011) and tweet (C1011) caps, but it's in parallel to the driver.
     
  11. mbz

    mbz Super Member

    Messages:
    2,174
    Location:
    Melbourne, Victoria
    Yeah, the layout does not appear to match the circuit diagram. Caps in that position (in parallel to the driver) are used to shunt unwanted
    frequencies away from the driver by presenting a lower impedance path. I've posted elsewhere that such caps are not in the audio path
    so you should not spend big $$$'s on boutique items. Better to spend the $'s on upgrading any series components. Think yamaha used
    electorolytics in these shunt positions, ie, cheap and nasty BUT that's all that's required. Use budget PP for the shunt items.
     

     

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  12. Guest125

    Guest125 Active Member

    Messages:
    353
    If in series it would limit its frequency. In parallel it adds capacitance to the load. It's effect is on the inductor.
     
  13. edwin

    edwin Active Member

    Messages:
    280
    Location:
    Philippines
    These were the caps I used on my 690II's. I used a 3.3uF and .22uF on my 690III's but since these were not available at hificollective, i decided to go with the 3.6uF instead. They ship worldwide.
    jantzen.JPG
     
    Last edited: Sep 21, 2018
  14. Bob

    Bob AK Subscriber Subscriber

    Messages:
    2,262
    Location:
    West coast
    as it stands, there are three parallel circuits, one for each speaker, and tuned circuits
    (some combination of the 3 types) to allow certain frequencies and prevent others.
    the middle circuit has high and low passes to reject higher (that then allows the tweeter
    to work) and reject lower (that then allows the woofer parallel circuit to work woofer frequencies)

    since there's ambiguity as to the posted parts/schematic, the woofer seems to be
    limited by the driver and not the network (and of course, this completely changes
    with the addition of pnly one single component).

    again, as it stands, it's somewhat elegant (and inexpensive) but it allows substitutions in case
    the drivers get blown as long as the driver/cabinet parameters are understood.

    more bass? as others have mentioned a subwoofer is mandatory

    but me being the sceptic, I'd recommend you have a friend, a meter, and a test tone
    generator (and an lp/cd with lots of pink/white noise tracks). the friend moves, tilts, orients
    the speakers to eliminate bass-type standing waves from lowering the bass output,

    you may be 6 inches away from magnificent window-rattling, chest compressions worthy
    of CPR, (or you might need them if its DSOTM), and one of my favorites is the opening
    scenes from Top Gun.

    enjoy the music
     
  15. onwardjames

    onwardjames Hoardimus Maximus Subscriber

    Messages:
    15,795
    Location:
    Kentucky
    These are fantastic speakers, I have a set of minty 690 III's, and the recap really improved the upper end. Bass not so much.

    Get a good sub, and let these do what they were intended to do (and they do very well) which is reproduce music faithfully, mostly free of color.
     
  16. tubed

    tubed Lunatic Member

    Messages:
    15,359
    Location:
    Aztlan

     

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  17. Ross6860

    Ross6860 AK Subscriber Subscriber

    Messages:
    1,656
    Location:
    Ohio
    I haven't had mine long, but I don't find them lacking in bass. They don't "slam", but I don't listen to rap or hip-hop. They do Rush, Mozart, and Led Zeppelin just fine

    Driving them with an ATI 1502 power amp.

    $250 sounds like an awful lot to re-cap these speakers.
     
  18. belgianbrain

    belgianbrain Super Member

    Messages:
    1,218
    Location:
    Greater Toronto Area, Canada
    It's not a lot for good caps.

    The first NS-690 pair I did about 8 years ago I tried using budget Solen caps and I was very disappointed by the resulting sound.

    After a year or so, I sprung for Mundorf Supreme caps (MKP for the big bass cap) and redid the crossover again. The sound was noticeably clearer and the bass noticeably stronger and tighter. With this crossover, I found the sound of the NS-690 to be much closer to the NS-1000.
     
  19. slimecity

    slimecity Super Member

    Messages:
    2,994
    Location:
    New Zealand
    Yup - had a pair of these too - scroed them for $10NZD - always regretted selling them - as they sounded incredible.

    But yea, they were way too bass-light for my tastes unfortunately.
     

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