qsc amplifiers

thejck
thejck Posts: 849
edited August 2007 in Electronics
Anyone has any thoughts experience with QSC amplifiers. I saw a listing on craigslist for a pair of MX700's and a EX2500 and wanted to know if anything had anything good to say about them.. I am looking at setting up a 2 channel setup probably using the polk rti12's. I looked though the whole forum and no one has discussed them so I am guessing that they are not good/popular..?
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  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    edited August 2007
    Why not use QSC speakers too? PA gear has its place and that place is rarely in our home.
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

    2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
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  • tonyb
    tonyb Posts: 33,023
    edited August 2007
    Watch it Dennis,your starting to sound like Jessie:D
    HT SYSTEM-
    Sony 850c 4k
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    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
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  • Systems
    Systems Posts: 14,873
    edited August 2007
    Great subwoofer amps.
    Testing
    Testing
    Testing
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  • Midnite Mick
    Midnite Mick Posts: 1,591
    edited August 2007
    I use one as my sub amp. I have mine in a closet because it's fan is quite noisy.

    Thanks,
    Mike
    Modwright SWL 9.0 SE (6Sons Audio Thunderbird PC with Oyaide 004 terminations)
    Consonance cd120T
    Consonance Cyber 800 tube monoblocks (6Sons Audio Thunderbird PC's with Oyaide 004 terminations)
    Usher CP 6311

    Phillips Pronto TS1000 Universal Remote
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  • thejck
    thejck Posts: 849
    edited August 2007
    i see your points. i am new to this game. I was just asking here to get a quick response. I have been researching it in the mean time i see the built in fans and I am not too impressed by the fans. If no one has anything good to say about it i didnt want to waste a trip to the persons house to see/hear how it sounds.
    thanks for your input either way
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  • Ron Temple
    Ron Temple Posts: 3,212
    edited August 2007
    The QSC PLX and PLX2 amps have the quiet fan...there are some AVSers that swear by them for HT. I was tempted, but went used traditional HT SS.

    Combo rig:

    Onkyo NR1007 pre-pro, Carver TFM 45(fronts), Carver TFM 35 (surrounds)
    SDA 1C, CS400i, SDA 2B
    PB13Ultra RO
    BW Silvers
    Oppo BDP-83SE
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  • thejck
    thejck Posts: 849
    edited August 2007
    any views on audiosource??
    looking at a pair of amp threes. in bridged mode will provide 400 watts of power.

    I am just looking for some input on some good power amps. that I can find of a craigs list for less. My wife won't let me spend too much money and thats why i am looking at craigs list because I can try out the equipment before I buy it.
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  • phuz
    phuz Posts: 2,372
    edited August 2007
    Audiosource makes decent stuff. Good stuff for good prices.

    QSC makes some really awesome pro audio gear. Used tons of their stuff with EAW, JBL, etc. back in the rave days of the 90's.
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  • thejck
    thejck Posts: 849
    edited August 2007
    if i was going to buy a used amp what would I look for when i go over to listen.. other than the outside and checking to make sure the amp actully powers the speakers.
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  • phuz
    phuz Posts: 2,372
    edited August 2007
    Try to get amps that can handle a 4ohm load. Check to see if the speaker connectors only accept pins, or if they have binding posts that accept spades and/or bananas.

    Make sure both channels work, and listen for snaps, crackles, pops. Listen for dips in volume or inconsistent volume during demanding parts of your demo music (usually low frequencies). Those are usually signs of an amp on it's way out...
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  • askinquestions
    askinquestions Posts: 80
    edited August 2007
    thejck wrote: »
    any views on audiosource??
    looking at a pair of amp threes. in bridged mode will provide 400 watts of power.

    I am just looking for some input on some good power amps. that I can find of a craigs list for less. My wife won't let me spend too much money and thats why i am looking at craigs list because I can try out the equipment before I buy it.

    You can always use the old, I got it on sale bit like women and lie about how much you spent.:D
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  • thejck
    thejck Posts: 849
    edited August 2007
    joint checking was invented by woman to prevent men from doing just that.
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  • thejck
    thejck Posts: 849
    edited August 2007
    i am by no means a audiophile and i have 2 options a adcom gfa 555 or 2 audiosource amp 3 for about the same price. to power 2 rti12 which would be better.
    should i do the single gfa 555 rated at 200 amps stereo or the 2 amp3's rated at 400 bridged??
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  • phuz
    phuz Posts: 2,372
    edited August 2007
    Go for the Adcom.
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  • engtaz
    engtaz Posts: 7,664
    edited August 2007
    Adcom
    engtaz

    I love how music can brighten up a bad day.
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  • thejck
    thejck Posts: 849
    edited August 2007
    will the 200 watts of power be enough for speakers that are rated upto 500 watts i dont listen to my speakers very loud but i would like to be able to turn them up if I need too. could i possible use the adcom in mono bridged mode in the future if i get another one?
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  • phuz
    phuz Posts: 2,372
    edited August 2007
    You'll be deaf before that Adcom chokes. It'll rock.
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  • thejck
    thejck Posts: 849
    edited August 2007
    whats the difference between the adcom gfa 555 and the 555 II
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  • F1nut
    F1nut Posts: 50,828
    edited August 2007
    The II
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • thejck
    thejck Posts: 849
    edited August 2007
    sweet i am really excited i hope to check it out saturday and buy them. it will be the first power amp i own.
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  • mhardy6647
    mhardy6647 Posts: 34,039
    edited August 2007
    Quite a few folks in New England are using vintage Altec PA/theatre speakers in their homes... not with PA amps, though! :-)
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  • thejck
    thejck Posts: 849
    edited August 2007
    would i be happier with the gfa-555 or 2 monoblocks gfa-565..or will I not know the difference
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  • phuz
    phuz Posts: 2,372
    edited August 2007
    thejck wrote: »
    would i be happier with the gfa-555 or 2 monoblocks gfa-565..or will I not know the difference

    Only you can answer those questions.
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  • thejck
    thejck Posts: 849
    edited August 2007
    any thoughts on using the gfa-555 in bridged mode vs the 565
    i dont have a way to listen to them both together. just looking for thoughts and suggestions
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  • thejck
    thejck Posts: 849
    edited August 2007
    should adcom amps be serviced checked out by professionals before you buy them used??
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  • askinquestions
    askinquestions Posts: 80
    edited August 2007
    thejck wrote: »
    whats the difference between the adcom gfa 555 and the 555 II

    The II I believe added a cooling fan and upgraded capacitors or something. There's some good deals on fleabay.
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  • VR3
    VR3 Posts: 28,816
    edited August 2007
    No Adcom amps, as far as I know uses a cooling fan. Why would you need a cooling fan?
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • thejck
    thejck Posts: 849
    edited August 2007
    could someone answer this question for me please. i am trying to decide between a gfa555 and 2 gfa565.

    if i got one gfa555 and then got another and run them bridged mono would that reduce the sound quality since the thd increases. Isnt the gfa555 run in mono bridged rated at 600rms which would be better than the g565. Or is there some advantage to starting out with pure mono blocks.
    money is an issue right now and i can get the 555 and get started and then later worry about the second one.

    will be powering some rti12 for mainly 2 channel
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  • phuz
    phuz Posts: 2,372
    edited August 2007
    In theory, mono blocks would sound better. It's debatable though which is probably why nobody wants to pipe up and start the debate.

    Go with what fits your budget. You won't be disappointed.

    Less than 1%THD is not audible. (also debatable)
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  • blakeh
    blakeh Posts: 491
    edited August 2007
    I think it all comes down to your budget. The 555 would be formidable amp and would drive your speakers all day long at ear-bleeding levels. Based on some of the questions you've asked, I think you would be very happy with the 555 and you would save yourself some cash. Down the road if you want to try something else, you could get most of your money back out of the 555 and upgrade.

    That being said, the mono blocks would be a step up from the 555, but will cost you more (in most cases).
    /COLOR] [U][URL="http://www.polkaudio.com/forums/showcase/view.php?userid=68366"][COLOR="Blue"]My Rigs[/U][/COLOR][/URL] [COLOR="Red" Balanced Audio Technology | Revel | Dodd | Monarchy | PS Audio | MIT | Polk | Etc.
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