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Thread: atlas 12

  1. #1

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    Default atlas 12

    right now i have a Shiva in a 142.5L box. Here's the problem. my wife one fateful day left the volume on my theater at 0DB (very loud). I turned it on, not knowing this, and the system just blasted out and scareed the hell out of me. at first, i thought all the drivers were ok, but now i notice that my shiva farts (not clanking) a little more than usual when pushed hard.

    I hear wonderful things about the atlas 12 from ascendant audio, also regarding their adjustable Qts. Anyone have any opinions as to how an Atlas would fly in a 142.5L ported box? what Qts would i use if i did use it.

    I allready emailed ascendant audio, but wanted some persepective from you guys as well. thanx for your help.
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

  2. #2

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    Call Ascendant and ask for Chad. He can answer just about any question about the drivers. I ordered a 15" from him last week for an IB system. I talked to him for several minutes about different settings and uses.

    BTW, what amp are you using for your sub?
    Tschüss
    Zach

  3. #3

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    I did a quick model in WinISD pro and it should work fine. The Atlas 12 and Shiva seem to model pretty similar.
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15

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    i'll give chad a call. i have a 500 watt parts express plate amp (picked it up when it was on sale.)
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

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    Originally posted by tryrrthg
    I did a quick model in WinISD pro and it should work fine. The Atlas 12 and Shiva seem to model pretty similar.

    by chance, what QTS did you use in the model, low mid or high?

    p.s., thanx by the way
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

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    Check the gasket on the Shiva. Farting is usually not a problem with the driver, but an air leak.

    Closed cell foam tape for sealing doors works great.

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    Originally posted by ohskigod
    by chance, what QTS did you use in the model, low mid or high?

    p.s., thanx by the way
    Low qts
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15

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    thats what i figured, just wanted to check.....thnx
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

  9. #9

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    Originally posted by ohskigod
    thats what i figured, just wanted to check.....thnx
    No problem! I'm trying not to model the Atlas drivers too much, it just makes me want one more! :D
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15

  10. #10

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    I'd certainly like to hear your impressions of the Shiva vs. the Atlas 12 if you decide to purchase it. I placed one in an SVS enclosure and it works great.
    HT/2-channel Rig: Sony 50” LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."

  11. #11

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    Originally posted by Graham
    Check the gasket on the Shiva. Farting is usually not a problem with the driver, but an air leak.

    Closed cell foam tape for sealing doors works great.


    Graham might be right. checked the driver thouroughly today, voice coil seems fine, no grinding when i push on it. nothing seems out of the ordinary. Played Elektra at moderate volumes with some bass intense scenes with no issues. Maybe i pushed it a little hard a couple of times. will pop out the driver and check the seal.

    of course, even if the Shiva is ok, i'm now officially intrigued by the Atlas 12. 145 bucks? XBL motor? 18mm Xmax. seems quite a bit beafier than the Shiva for not much more cheddar.
    I was allways happy and surprised by the Shiva's output, if the Atlas is much more, i'm looking at a significant increase in performance.

    I'll still call Chad or wait for the email from their tech dept about their stance on using my box. I'm assuming it wont be an issue since tryrrthg says it plots out ok in WinISD.
    Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center

    2 Channel -
    Anthem Pre 2l, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Polk LSi9 w external modified Crossovers (thanks Trey!)

  12. #12

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    I had a Shiva for a few weeks before it was blew out. I have had and Atlas in the same enclosure for several months and it works great. It is powered by a Rythmik 350 with the gain turned up only half way and it is quite loud.
    Samsung PN60E6500
    Denon AVR-E300
    Mains: LSI9s
    Center: LSIC
    Surrounds: LSIFX
    Subs: Two Atlas 12's with Rythmik 350W amps in ported 95L box.
    Power: Monster 2600 power conditioner

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