PartsExpress: Dayton "AIRs" -- what do y'all think?

Discussion in 'The Doorway' started by mhardy6647, Feb 9, 2018.

  1. Hi All; sorry for the delay. The woofer is a Dayton model no.DC160S-4 Nice heavy well built driver. The xover is the inductor, that I am not sure of the value, wired from the positive speaker input in series with a Solen 7.5 uf 400v cap connected on the other end with a 6ohm 1% wirewound resister mills mra 12 which then is wired to the positive of the tweeter. I will try to post a photo asap. Also I might be able to get the inductor value from old orders placed on Parts Express. Thanks for your patience. A lot of times these mods don't seem all that effective; or they just change the sound without really improving, but in this case it seems to work well. Cheers.
     
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  3. mhardy6647

    mhardy6647 Señor Member

    saw this link to a 'review' of the cheaper, non-AMT morph of these little loudspeakers Someplace Else.
    Might be of interest to someone here, so I'll share the link. Again, this version has a very generic/basic little dome tweeter in lieu of the generic AMT found on the B652-AIR.

    https://cheaptubeaudio.blogspot.com/2013/10/?m=1

    Offered strictly FYI & FWIW, as-is, YMMV, et cetera, et cetera, et cetera. :)
     
  4. mhardy6647

    mhardy6647 Señor Member

  5. mhardy6647

    mhardy6647 Señor Member

    DSC_1485 (2).JPG DSC_1487 (2).JPG DSC_1480 (2).JPG
     
  6. Audionut

    Audionut Next Round Is On Me

    So @mhardy6647 , what does it sound like? (I secretly thought of buying one too; they are practically giving them away!)
     
  7. mhardy6647

    mhardy6647 Señor Member

    well, if you look at that Polk forum thread, you'll see that I started with cannon fodder loudspeakers -- to wit, the titular AIRs :)

    (and you'll see why)

    But, you know what? It does not sound bad at all.
    It's a weird component, no matter how you look at it -- but it's not embarrassing at all to listen to.
    By tomorrow, perhaps I'll work up the nerve to try it on a pair of real loudspeakers.
     
  8. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    Congratulations, @mhardy6647 :)

    Well deserved Good Karma. :)

    Is it using a Class D power amp section?
     
  9. mhardy6647

    mhardy6647 Señor Member

    Per that "radiomuseum" link, the power amp uses LM1875 chips, and according to TI's website, that operating class of the LM1875 is class AB.
    http://www.ti.com/product/LM1875

    I will pop the hood (or, perhaps more accurately, drop her drawers) and see what's really inside anon.

    Among the Great Mysteries of the Ages for this amplifier.

    • Does either of the tubes actually do anything? (particularly the EL84)
    • Does the amp really run the filament voltage just short of thermonuclear fusion?
    • Does anything sub for a Chinese 6N1?
    • What's under that "transformer bump"? (if anything)
     
  10. mhardy6647

    mhardy6647 Señor Member

    I did some Googling last night and it is really unclear to me

    1) Is a Chinese 6N1 "identical to" a Russian 6N1P?
    2) Can a 6922 be safely/effectively installed in this little amplifier?

    of course, re: 2) effectively would presuppose that the preamp tubes actually do something in this amplifier. :p
     
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  11. mhardy6647

    mhardy6647 Señor Member

    A completely sideways datapoint.

    I extracted one of the small signal tubes (labeled "6N1-J", actually, not that this is very helpful) and tested it, just for shoots and googles* in my trusty and longsuffering Sencore Mighty-Mite III emissions tester.

    It tests good as a 6922 :)

    __________________
    * as I like to say... I like this slightly better than the more common phraseology :)
     
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  12. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    SCIENCE strikes again! :)
     
  13. mhardy6647

    mhardy6647 Señor Member

  14. StevenZ

    StevenZ Active Member

  15. mhardy6647

    mhardy6647 Señor Member

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  16. mhardy6647

    mhardy6647 Señor Member

    so -- y'all can probably tell from the long delay in my posting anything to this thread that I wasn't terribly impressed with these little cheap loudspeakers in their stock configuration, although, yea, the little "AMT" tweeters are nice.

    I am posting to it today, though, because I stumbled across this little "review" (of sorts -- consider the source! ;) ) link posted Someplace Else.
    https://www.cnet.com/news/this-starter-audiophile-system-sounds-outrageously-good-for-88/

    I actually haven't tried the speakers with the little Lepai amp (I have one of the earliest morphs thereof, bought on sale long ago wicked cheap); guess maybe I should -- you know, for completeness.
     
  17. 88 isn't bad. My son is asking for a subwoofer to compliment the Jolida PSB combo. I'm thinking this might be a better direction. Hope I'm not thread jacking @mhardy6647 . Good topic!
     

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