Official(?) Adcom Owner's Thread

[arrt vandelay]

ok, so i didn't find an adcom thread, so i figured i'd start one. i have owned a 2 channel gfa 545 II and just bought a 5 channel gfa 7400. both amps were made in the mid to late 90s(7400 may be a little younger), so they have some age. but these things are friggin built like tanks, and it's great to see the "made in usa" on the back.

i loved my gfa 545 II enough to take a chance on the gfa 7400, and i'm quite glad i did. i certainly don't need separates, but older adcoms certainly are affordable and never seem to die.

any other adcom owners in the forum?

[talstarone]

Hi arrt,my Friend.
I guess you could count me in,on two different accounts.

One is the Adcom GFA-545II I purchased from a member of this Forum About a week and a half ago.

And then,since 1996,I have owned a Wonderful Adcom GSP-560.Which is a Surround Sound Processor with Built in Amps.It has not given me any troubles in the 14 years I have owned her.And in some ways,sounds as good(even Better)then other processors.

Very Nice Purchase on the Adcom GFA-7400.I imagine it sounds wonderful covering 5-Channels of Adcom Goodness.

They Are Built Exceptionally Well.But use extremely High Quality Parts in Areas where they could save some money.

But Adcom has a Strong,Powerful Sound.
Not A Bass Heavy Sound, but its not lacking any signal to the lowest frequencies obtainable.

And its mid is somewhat forward with a Good Clarity and a Great Reproduction of Voices and Sound Effects.And a Wonderfully Full High End.Not Laid Back,but not Bright and Artifically sounding either.

Adcom simply takes the signal it receives and not only makes it Louder.
It Also Gives It A Distinct Sound,That Is Strictly "ADCOM".

[arrt vandelay]

Originally Posted by talstarone

Hi arrt,my Friend.
I guess you could count me in,on two different accounts.

One is the Adcom GFA-545II I purchased from a member of this Forum About a week and a half ago.

And then,since 1996,I have owned a Wonderful Adcom GSP-560.Which is a Surround Sound Processor with Built in Amps.It has not given me any troubles in the 14 years I have owned her.And in some ways,sounds as good(even Better)then other processors.

Very Nice Purchase on the Adcom GFA-7400.I imagine it sounds wonderful covering 5-Channels of Adcom Goodness.

They Are Built Exceptionally Well.But use extremely High Quality Parts in Areas where they could save some money.

But Adcom has a Strong,Powerful Sound.
Not A Bass Heavy Sound, but its not lacking any signal to the lowest frequencies obtainable.

And its mid is somewhat forward with a Good Clarity and a Great Reproduction of Voices and Sound Effects.And a Wonderfully Full High End.Not Laid Back,but not Bright and Artifically sounding either.

Adcom simply takes the signal it receives and not only makes it Louder.
It Also Gives It A Distinct Sound,That Is Strictly "ADCOM".

am loving the 7400 even more pushing some new deftechs i scored off of craiglist this past weekend. i see where you got some paradigms. looks like we're both going through a re-do/re-vamp...fun stuff. at least we know the adcoms will be there probably longer than any new speakers we acquire...

[HedgeHog]

Congrats on your new acquisition!

Adcom was my very first better system....it was high end to me back in 89. I ran the GFP-555 with the GFA-555 through B&W CM2s. Absolutely loved it...still do. That system is hibernating in a room but I plan setting it back up again. I still recall there were tons of ads in the back of Stereophile and The Absolute Sound that offer mods to Adcom...WonderCaps, better connectors, etc. Ah, the good old days.

[sydney]

I have the GFA 555 the GFA 5500 a GFA 5*** cant remember # but its 4 ch and 2 can be bridged mono to make it 3 ch. all of them from the 1980s, only had to replace some fuses.

[arrt vandelay]

Originally Posted by sydney

I have the GFA 555 the GFA 5500 a GFA 5*** cant remember # but its 4 ch and 2 can be bridged mono to make it 3 ch. all of them from the 1980s, only had to replace some fuses.

so you're going on 25yrs or so? gotta love that...

[arrt vandelay]

Originally Posted by HedgeHog

Congrats on your new acquisition!

Adcom was my very first better system....it was high end to me back in 89. I ran the GFP-555 with the GFA-555 through B&W CM2s. Absolutely loved it...still do. That system is hibernating in a room but I plan setting it back up again. I still recall there were tons of ads in the back of Stereophile and The Absolute Sound that offer mods to Adcom...WonderCaps, better connectors, etc. Ah, the good old days.

yeah, adcoms seemed to rule the 90s. most of their newer stuff seems over-priced when compared to the likes of emotiva, etc nowadays, but the older stuff is where it's at. everything built very well and could very well last for another 10 or 20 yrs...

[arrt vandelay]

any adcom owners leave their amps on all the time? i'm thinking of leaving my gfa 7400 on all the time to avoid the thump. maybe i should try for a month to see the effect on the power bill...


my gfa 7400 has that trademark adcom "pop/thump" during power on that's more pronounced than it was on my gfa 545II. i think it's just the fact that the gfa 7400 is running all channels now so every speaker is getting the "thump." the sound scared me at first, but after researching it i know that probably all adcoms have the same "hello, you just turned me on sound." no pansy soft relays to get in the way of the signal here...

[talstarone]

Originally Posted by arrt vandelay

any adcom owners leave their amps on all the time? i'm thinking of leaving my gfa 7400 on all the time to avoid the thump. maybe i should try for a month to see the effect on the power bill...


my gfa 7400 has that trademark adcom "pop/thump" during power on that's more pronounced than it was on my gfa 545II. i think it's just the fact that the gfa 7400 is running all channels now so every speaker is getting the "thump." the sound scared me at first, but after researching it i know that probably all adcoms have the same "hello, you just turned me on sound." no pansy soft relays to get in the way of the signal here...

I am glad you brought that up,my Friend. I was wondering if all Adcoms had that quick turn on noise.I know some people describe it as a soft thump.
But what would you think if it was described as a quiter version of the sound a Microwave Makes for about a 1/2 second.

Do you think it would be the same thing.As it only occurs for about 1/2 second when the Power Button gets pushed On.And its not with my Adcom,I call it an On Thump(more like a thud)
But someone else described theirs that way.

And since it occurs just at that time,I would think its the same noise as powering up.

I do know many people that do leave their amp on continiously.They say that having certain parts already "warmed up" allows it to sound better.Sort of like the AC or heat in a car.Cranking it up and turning it on for about 5 maybe 10 minutes before you leave.So its comfortable when you get in.

I have also heard some say it increases the life span,as certain parts aren't subjected to the "shock" of powering on and off.I dont know if its for solid state or tube amps, or both.
Or if its totally untrue or completely right.I will make it a point when reading thru my mags each month I pay attention to if that point is mentioned.

I may also leave Adcom a customer service question about this.I know Adcom and Rotels websites have always provided quick,courteous replies, to any question or comment I ever leave.

Also,as far as power consumption is involved;I dont think it would add an extra $2 or $3 dollars total.

I look at the levels on my Line Conditioner when I power up and when in use.And it really doesn't pull a lot of current.

My LCD TV I had last year used more current then my AVR and Blu Ray Player Combined.When I got the projector I gave it to my Dad.As I have to live at home because of my physical state.And my parents are in their upper 60's.So they have their own,seperate bedrooms now.And they both had 26inch LCD's in each.And my Dad leaves his TV on all night,almost every night.

So,I didn't need my TV with the Projector(because I never watch TV)Maybe the weather or a major world event(and sports)but thats all.
So,I gave my Dad my 37 inch LCD(and he gave me his 26in for set up and On-Screen Display Menus)So I dont have to fire up the projector for that.

But our light bill jumped up $10.00 a month,with the change in TV's in his room.
If you have a Line Conditioner with a curent or amp read out.Watch how much it increases and drops when you turn different components on and off.

I hope you have been enjoying the new Amp.
Must have made a nice change in allowing the amp to power those channels,instead of the AVR.

When you have some time,I would love to hear how you feel about your new multi-channel Adcom.(Also compare it to the 545II you sold me.I wont take anything the wrong way,I promise).

I would just like to know if with different models and different years.How the sound changed as they introduced newer models and new technologies.

[sydney]

I leave my Adcom amps on all the time, the only amps I turn on and off are my tube amps.

[arrt vandelay]

Originally Posted by sydney

I leave my Adcom amps on all the time, the only amps I turn on and off are my tube amps.

yeah, i think i'm going to try this for a month. of course the results could be skewed b/c of the summer right around the corner and the a/c kicking on. right now, my power bills come in ~$45 to $55 a month(considering just my wife and i live in a 1900sq ft 4 bedroom house, i think that's really good). during the summer the bills can spike to ~$120 or so depending on how hot it is. if i realistically am only adding $3 to $5 bucks a month, i think i'll just leave the adcom on all the time...

[HedgeHog]

I connected the ACE-515 to control them...the thump is much softer when turning on and fizzes out when going off. The idea is to have preamp control on first and off last to minimize the thump. A lot of AV ups/line conditioners have delayed on/off now so you get that option readily.

For the record, I always turned everything off when not using it...I don't think solid state amps need too much warming up to sound good; unlike tubies. Unless your place is like a fridge.

[arrt vandelay]

Originally Posted by talstarone

I am glad you brought that up,my Friend. I was wondering if all Adcoms had that quick turn on noise.I know some people describe it as a soft thump.
But what would you think if it was described as a quiter version of the sound a Microwave Makes for about a 1/2 second.

Do you think it would be the same thing.As it only occurs for about 1/2 second when the Power Button gets pushed On.And its not with my Adcom,I call it an On Thump(more like a thud)
But someone else described theirs that way.

And since it occurs just at that time,I would think its the same noise as powering up.

I do know many people that do leave their amp on continiously.They say that having certain parts already "warmed up" allows it to sound better.Sort of like the AC or heat in a car.Cranking it up and turning it on for about 5 maybe 10 minutes before you leave.So its comfortable when you get in.

I have also heard some say it increases the life span,as certain parts aren't subjected to the "shock" of powering on and off.I dont know if its for solid state or tube amps, or both.
Or if its totally untrue or completely right.I will make it a point when reading thru my mags each month I pay attention to if that point is mentioned.

I may also leave Adcom a customer service question about this.I know Adcom and Rotels websites have always provided quick,courteous replies, to any question or comment I ever leave.

Also,as far as power consumption is involved;I dont think it would add an extra $2 or $3 dollars total.

I look at the levels on my Line Conditioner when I power up and when in use.And it really doesn't pull a lot of current.

My LCD TV I had last year used more current then my AVR and Blu Ray Player Combined.When I got the projector I gave it to my Dad.As I have to live at home because of my physical state.And my parents are in their upper 60's.So they have their own,seperate bedrooms now.And they both had 26inch LCD's in each.And my Dad leaves his TV on all night,almost every night.

So,I didn't need my TV with the Projector(because I never watch TV)Maybe the weather or a major world event(and sports)but thats all.
So,I gave my Dad my 37 inch LCD(and he gave me his 26in for set up and On-Screen Display Menus)So I dont have to fire up the projector for that.

But our light bill jumped up $10.00 a month,with the change in TV's in his room.
If you have a Line Conditioner with a curent or amp read out.Watch how much it increases and drops when you turn different components on and off.

I hope you have been enjoying the new Amp.
Must have made a nice change in allowing the amp to power those channels,instead of the AVR.

When you have some time,I would love to hear how you feel about your new multi-channel Adcom.(Also compare it to the 545II you sold me.I wont take anything the wrong way,I promise).

I would just like to know if with different models and different years.How the sound changed as they introduced newer models and new technologies.

well for one thing, the turn-on noise of the gfa 545II was more of a general "thud." the turn-on noise of the gfa 7400 via 12v trigger from my receiver is more of a "pop." either way, my speakers were/are no worse for wear. to be honest, i don't really notice that much difference in sound. i think what i do notice is the obvious difference in 5 separately amplified channels vs. 2. everything just seems to, dare i say it, have more balls. also, i swapped out my energy towers just 2 or 3 days after i hooked up the new amp, so my ears didn't have that much time to discern a difference.

i actually haven't wached a blu ray yet since acquiring the new amp. i have one i'd like to watch(the 2nd boondock saints movie), but the wife has vetoed so i'll probably have to wait until the weekend for that. my most pleasurable experience so far w/ the amp has been watching "the pacific." the amp paired with the deftechs did an awesome job there. also, more so in praise of the deftechs than the adcom, i was able to blast some tunes this morning will getting ready for work(wife normally leaves earlier than me so had the house to myself), and i was really impressed w/ the full spectrum sound that the bp10 and adcom combination could churn out...

[Bill C]

Hey guys had my 5500 for 20 plus years . I was looking at the 5006 6 channel amp for the center and the surrounds. its bridgeable but im confused on if I could bridge 2 for the center and have 4 for the surrounds ? If any one knows or have done this .