qsc amplifiers

[thejck]

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..?

[Dennis Gardner]

Why not use QSC speakers too? PA gear has its place and that place is rarely in our home.

[tonyb]

Watch it Dennis,your starting to sound like Jessie:D

[GV#27]

Great subwoofer amps.

[Midnite Mick]

I use one as my sub amp. I have mine in a closet because it's fan is quite noisy.

Thanks,
Mike

[thejck]

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

[Ron Temple]

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.

[thejck]

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.

[phuz]

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.

[thejck]

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.

[phuz]

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...

[askinquestions]

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

[thejck]

joint checking was invented by woman to prevent men from doing just that.

[thejck]

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??

[phuz]

Go for the Adcom.

[engtaz]

Adcom

[thejck]

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?

[phuz]

You'll be deaf before that Adcom chokes. It'll rock.

[thejck]

whats the difference between the adcom gfa 555 and the 555 II

[F1nut]

The II

[thejck]

sweet i am really excited i hope to check it out saturday and buy them. it will be the first power amp i own.

[mhardy6647]

Quite a few folks in New England are using vintage Altec PA/theatre speakers in their homes... not with PA amps, though! :-)

[thejck]

would i be happier with the gfa-555 or 2 monoblocks gfa-565..or will I not know the difference

[phuz]

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.

[thejck]

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

[thejck]

should adcom amps be serviced checked out by professionals before you buy them used??

[askinquestions]

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.

[Vr3MxStyler2k3]

No Adcom amps, as far as I know uses a cooling fan. Why would you need a cooling fan?

[thejck]

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

[phuz]

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)

[blakeh]

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).

[heiney9]

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

Generally in this instance you will not gain much if anything running a 555 bridged in mono. If it's mono you desire then get the 565 mono blocks. The 555 run in stereo will give more than you will probably ever use.

H9

[heiney9]

whats the difference between the adcom gfa 555 and the 555 II

Use the search function as I and others have answered this question in detail many times. In fact there is a lot of info about Adcom if you just take some time and effort to do your research. :)

H9

[thejck]

thanks for that info...

[heiney9]

No Adcom amps, as far as I know uses a cooling fan. Why would you need a cooling fan?

This is incorrect. As an option you could buy a factory cooling fan for the 555, 565 mono's, and the Limited Edition 585. The 565's and 585 are biased in class A pretty heavily and when run with a more difficult load can benefit from cooling although not nec.

When you bridge the 555 and run a difficult load it can benefit from the fan as well all these designs have internal heatsinks so could benfit from cooling in the right situation.

The GFA 5800 has twin cooling fans built into the tunnels of the heat sinks. The 5800 had internal heatsinks and needed to be kept cool if running a difficult load.

The 5802, 5500, 5400 all have external heatsinks and don't really have a need for cooling.

H9

[askinquestions]

No Adcom amps, as far as I know uses a cooling fan. Why would you need a cooling fan?


http://stereophile.com/solidpoweramps/678/index.html

This was an amp I was considering and was looking at the differnce between the 555/555 II....

[dexfx69]

I agree, Phuz.

[thejck]

is the parasound hca1500a enough to power a pair of rti12's or should i be looking to get a second amp and biamp them to make them sound better or am i good for now. i like the way they sound but this is new to me and I would not know if they could sound better unless i actully tried it out.
i do not listen to music at extremely loud volumes. i am using a halp p3 preamp.

[appadv]

is the parasound hca1500a enough to power a pair of rti12's or should i be looking to get a second amp and biamp them to make them sound better or am i good for now. i like the way they sound but this is new to me and I would not know if they could sound better unless i actully tried it out.
i do not listen to music at extremely loud volumes. i am using a halp p3 preamp.

Yes, it should be adequate enough for RTi12's.