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Fan is on more than usual?

Discussion in 'AV Receivers & Amplifiers' started by chedmaster, Sep 7, 2005.

  1. chedmaster

    chedmaster
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    Just upgraded my speakers, and the first film i watched (star wars 2) caused the fan on the amp to come on for the first time ever. TBH I didnt think it had a fan :D

    At the time i thought this was pretty cool, volume was about -26db, which although some may say thats childs play its very loud in my room to my young sensitive ears :laugh:

    Should I be worried? Its now coming on during most stereo sessions after about 25 mins with volume at about -35db depending on CD. Is it simply because the speakers are harder to drive? (still 8 ohms, same as old ones, but 3 way not 2 way) I would of thought that if this was the case Id have to turn it up more for the same volume :rolleyes:

    any thoughts appreciated, ta

    by the way the fan does a brilliant job, its like the amps switched off when its done its job :clap:
     
  2. eviljohn2

    eviljohn2
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    Probably not.
    Yes. :D

    There are several other factors to consider than the nominal impedence - is there a big difference in sensitivity? :)
     
  3. chedmaster

    chedmaster
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    eltax - 87db

    AE evo 3 - 90.5db

    i have no idea which is more sensitive, never really looked into sensitivity :confused:

    again wouldnt that just mean id have to crank it up more for the same level? im using roughly the same volumes as before.

    also just found out eltax liberty 5+ are 4-8 ohms. AE evos say 8 ohms.
     
  4. eviljohn2

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    According to those sensitivity figures the Evo3's should be easier to drive to the same volume.

    Just accept that better quality components are harder to drive and there's a difference somewhere in your new speakers - the 8R impedence that are quoted will only be a nominal value and they could quite easily swing much lower than that. My guess is that the Eltax speakers spend much of their frequency range well above 8R whilst the Evos spend more time with a lower impedence.

    From the description you've given your amp had a very light load before and these new ones just need a bit more grunt to get them going which needs the fan to cool your amp down. Don't worry about it as it's a normal thing to happen. :)
     
  5. chedmaster

    chedmaster
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    thanks :)

    i recently read up on linn activ configs, and had no idea that it wasnt the drivers that presented a difficult load to the amp, its the crossovers. and the more accurate the crossovers, the more power they need to suck out of the signal. around 30% for most.

    for the flagship linn speakers (active only) a 1000 watt amplifier would be needed, and 900watts of that would be used on the crossover :eek:

    i guess its got a much better crossover (partly because its three way?)


    thanks mate

    EDIT - might try the nytech again tomorrow, im think that beast could move a car :D
     
  6. eviljohn2

    eviljohn2
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    Definitely try the Nytech again, I think that you may get very different results with your new toys. :)
     
  7. alphabet

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    Ched. Now how about bi-amping those Evo's! Use the Nytech to deliver lower frequencies and the CA to deliver mids and highs or vice versa.

    Once I find a decent power amp, I am going to try that.
     
  8. chedmaster

    chedmaster
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    its tempting, but i think the sounds too diferent and the nytechs more powerful etc. maybe in the future :)
     
  9. Steve.EX

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    Bi-amping with two entirely different amps is generally considered as a bad idea, for lots and lots and lots and lots of reasons.
     
  10. chedmaster

    chedmaster
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    there you go :D
     
  11. Dfour

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    My Rotel sounds perfect with my Yamaha. :D

    Chedmaster you really need to be saving your pennies for the AE Evo centre:eek:
     
  12. chedmaster

    chedmaster
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    already got a power amp you see, my dad's old one.

    cant buy anything atm, need to pay for driving lessons and insurance.

    the evo's sound absolutely marvelous as they are, and the gale centre matches them tonally surprisingly well. its on the christmas list :D
     
  13. alphabet

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    Thanks for the reply Steve. It was an idea I was toying around with, but I will probably start building on a separates systems in the near future by adding a Rotel RMB-1066 bridged into 3 channels and at a later stage build from there.
     
  14. chedmaster

    chedmaster
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    tried the nytech again last night and WOW :eek:

    it was phenomenal. im still recovering :D
     
  15. eviljohn2

    eviljohn2
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    Nice. Any more info on the difference it made? You were short on bass with your old speakers but is that still a problem? :)
     
  16. chedmaster

    chedmaster
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    like before the higher stuff is much cleaner and more precise, and the deep stuff has so much punch now, its amazing how clear the bass is. i never realised how in your face bass guitars were, i can feel the deeper notes in my stomach!

    i can also crank it up a lot more without it feeling loud. the nytech, like the 540r, got much warmer when driving the evo's, i think that may have helped it, i dont think it ever got warmed up with the eltax's!

    the only problem is, every tim i turn it on, i get a loud thud, and the two bass cones move about 10mm out and then settle back in again (DC?). is there anyway i can stop this? should i just disconnect the positives of the outputs when i turn it on every morning? or should i leave it on 24/7?

    to answer original question, lack of bass is non existent now :D:D:D
     
  17. eviljohn2

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    Sounds like an excellent improvement.

    The DC thump shouldn't really cause a problem but you could either disconnect one of the input connections as you suggest or try putting a suitable capacitor in series with your speakers to block the DC signal. Suitable capacitors would be very expensive.

    I leave my subs on 24/7 because I can't be bothered to reach around the back for the switch and it prevents the initial thump. :)
     
  18. Steve.EX

    Steve.EX
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    Poor design if you ask me, that the outputs should not be momentarily muted whilst voltages settle.
    On many amps this would indicate a fault.
     
  19. eviljohn2

    eviljohn2
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    Or of course the DC muting capacitors may already have been destroyed. Has the amp been carefully used in the past - no connections made whilst it was hot?
     
  20. chedmaster

    chedmaster
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    i have no idea, its so old! got to be around 20 years old and i cant find any info on the net. do nytech exist today?

    i wouldnt be surprised if it had been slightly misused, my dad used to have several hundred people parties at new years when he worked in the city :D

    all he knows is that it cost him an awful lot of money a long time ago
     
  21. chedmaster

    chedmaster
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    the pre-amp is very similar to this

    the power amp is long and thin, with heat fins all down half of each side


    edit: after about 30mins of googling, i think the power amp is a CPA602. theres no model no. on the back, but it looks identical. it achieved legendary status challenging top end amps in the late 80's apparantely :)
     

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