Adcom gfa-7707 + denon avr-4308ci

Bernal

Hi,
1) My equipment supplier gives me the following options:
ADCOM GFA-7707
Channels: 7
Power Per Channel: 200 watts (8Ω);
300 watts (4Ω)
Power Bandwidth: 3 Hz-130 kHz
ADCOM GFA-7705
Channels: 5
Power Per Channel: 200 watts (8Ω);
300 watts (4Ω)
Power Bandwidth: 3 Hz-130 kHz.
2) I said that the ADCOM GFA-7607 Power Per Channel: 125 watts (8Ω) would be equally Denon AVR-4308CI. Is that true?
3) I can explain. I do not understand. If I buy an Adcom 7607 remain unchanged. What is better if I add an Adcom amp to the speaker LSi.
4)Gives me the speakers LSiF / X for Surround Sound, PSW1000/PSW505 for SubWoffer. You think of the recommendation?

______________________________
1) DENON AVR-4308CI: Advanced 7.1 CH/5.1+2 CH/ 3.1+2+2 CH A/V Home Theater /MultiMedia Multi-Source/Zone Receiver with Networking and WiFi/170 watts x 7 channels
2) HITACHI P55T501. 55" HD1080 Plasma HDTV
3) DENON DVD-1740: Progressive Scan DVD Video/CD Player
4) DENON DVD-2500BTCI: Blu-ray Disc™ DVD/CD Digital Player/Transport
5) POLKAUDIO LSiC (Center speaker)
6) POLKAUDIO LSi15 LEFT (Front speaker)
7) POLKAUDIO LSi15 RIGHT (Front speaker)
8) SONY SS-MSP16 LEFT (Surround speaker)
9) SONY SS-MSP16 RIGHT (Surround speaker)
10) SONY SS-CNP16 LEFT (Surround back speaker)
11) SONY SA-WP16 ( Sub Woofer 2X200W)

CRESCENDOPOWER

From the Adcom website for the 7705, and 7707:

"Please note: This amplifier is supplied with a 20 amp AC plug and requires a dedicated 20 amp 120V AC circuit with a 20 amp 120V receptacle. Note that the plug and required receptacle are not the same as the standard 15 amp plug and receptacle found on most electric products and household outlets. We suggest you consult an electrician if you are uncertain about the capacity of your electrical circuit and the required receptacle."

Ender

I... don't.... understand......... *brain melts*

CRESCENDOPOWER

Ender wrote: »

I... don't.... understand......... *brain melts*

I have a 7-channel home theater amp that puts out 2000 watts continuous into a 1-ohm load, all 7 channels driven continuously for 60 minutes with .05% total harmonic distortion. A 9-volt battery powers it, and I replace it once every two years.
Now do you understand?:D

disneyjoe7

CRESCENDOPOWER wrote: »

I have a 7-channel home theater amp that puts out 2000 watts continuous into a 1-ohm load, all 7 channels driven continuously for 60 minutes with .05% total harmonic distortion. A 9-volt battery powers it, and I replace it once every two years.Now do you understand?:D

No way powered by a 9v battery power .000002 watts continuous

Bernal

Meet the electrical requirements of Adcom. Even without understanding. No answer to my question?.

disneyjoe7

Bernal wrote: »

Meet the electrical requirements of Adcom. Even without understanding. No answer to my question?.

A 20 amp cord will not plug into a 15 amp receptacle (read outlet).

McLoki

LSiFx are good speakers - whether to go with those or LSi7's (or even 9's) for your rear speakers is a matter of personal preference and placement options.

I would go with a better sub than his recommendation - but that is just me.

Even at the same rated power - an amp will typically drive the speakers better than a receiver. There have been numerous threads on this but it boils down to this - Amps and AVR's do not rate power the same and they only give one specification (watts) but not others (slew-rate, current, etc.) to compare them. While the watts may appear similar at first glance, they are not. Also the other non-mentioned specifications are often better.

Granted this is a generalization - if you are overly concerned about it - just get the 7707 and don't worry about it.

Michael

Bernal

Hi,
Researchers found in www.hometheaterhifi.com" the next report. If so, why I need a amplifier?.

http://www.hometheaterhifi.com/receivers/313-a-secrets-receiver-review.html?start=2
"Conclusions:
Personally, there are two major things I associate with a receiver bearing the Denon brand name: feature-richness and quality performance. The AVR-4308CI exemplifies both of these characteristics to a tee. As you can tell from the body of this review, the 4308CI is not wanting for any feature. Basically if it is out there, this unit has it. From the network functions, to the audio codecs, to the video processing, you won't be left wishing there were something else this receiver could do (at least not until some super new 10 channel super surround audio codec is released!). As for performance, this is what I would expect in something from Denon, that is to say this receiver sounded nothing short of magnificent. No matter what movie, album, or format I tested, the 4308CI was simply outstanding. The amplifiers, capable of an advertised 140 watts per channel, never got tired, even as I played source material at reference levels. I think our own Brian Florian said it best that nowadays we are after the “True Sound”, meaning the receiver's reproduction of the source material is so true to the original that it doesn't call attention to itself as “bright”, “warm”, or any other adjective. The Denon fits that bill. It takes anything you throw at it and lets your speakers shine.
The bottom line here, as you have probably already guessed, is that the AVR-4308CI what I had hoped it would be over a year ago. At an MSRP of $2,499, this is definitely on the higher end of the receiver spectrum. However, when you consider what it brings to the table and how much separate components that do all of these things would cost, it may actually be a bargain. Kudos to Denon for putting out a product that is an excellent achievement in the audio/video receiver category.".

"Some Responses:
written by Gabe , July 25, 2008

Sorry for the delay in answering these questions...

Internet Radio Stations:
Yes, you can customize a list of Internet Radio Channels and play them without having a computer in the path. It is much easier to CREATE the channel list on a computer, but once there, the channels stream directly.

THX Certification:
Well, I don't know that I would say this is a deal breaker. THX certification simply means that the component meets a certain set of standards and features as defined by the THX certification, and has been tested to meet these requirements by THX. Just because the Denon doesn't have that label doesn't mean it doesn't meet those standards. It likely means that Denon simply didn't want to pay to have this unit certified. I certainly would NOT rule a component out of my short list for a home theater simply because it is not THX certified. Again, it will be about what sounds/looks good to you with your own eyes and ears!

4 Ohm loads:
This receiver can definitely connect to speakers rated for 4 Ohms. There is a protection circuit that will trigger and shut the unit down if you try to drive the speakers to hard and the receiver heats up as a result, but I would imagine you need to drive them very hard for a very long time and have bad ventilation for this to occur."

McLoki

Certainly not worth arguing about - your speakers and your money. Get what you like - I am sure it will sound great.

Enjoy and welcome to Club Polk...

Michael

Bernal

Thank you all. Looking to learn to achieve a better sound.

cnh

I would get the Adcom 7705, the 5 channel and let your Denon handle the last two channels of the 7.1, you really don't need to worry about those back channels that much. And get the best sub you can afford? Depends a lot on the size of your room.

Just my opinion.

cnh

ben62670

Bernal wrote: »

Hi,
Researchers found in www.hometheaterhifi.com" the next report. If so, why I need a amplifier?.

http://www.hometheaterhifi.com/receivers/313-a-secrets-receiver-review.html?start=2
"Conclusions:
Personally, there are two major things I associate with a receiver bearing the Denon brand name: feature-richness and quality performance. The AVR-4308CI exemplifies both of these characteristics to a tee. As you can tell from the body of this review, the 4308CI is not wanting for any feature. Basically if it is out there, this unit has it. From the network functions, to the audio codecs, to the video processing, you won't be left wishing there were something else this receiver could do (at least not until some super new 10 channel super surround audio codec is released!). As for performance, this is what I would expect in something from Denon, that is to say this receiver sounded nothing short of magnificent. No matter what movie, album, or format I tested, the 4308CI was simply outstanding. The amplifiers, capable of an advertised 140 watts per channel, never got tired, even as I played source material at reference levels. I think our own Brian Florian said it best that nowadays we are after the “True Sound”, meaning the receiver's reproduction of the source material is so true to the original that it doesn't call attention to itself as “bright”, “warm”, or any other adjective. The Denon fits that bill. It takes anything you throw at it and lets your speakers shine.
The bottom line here, as you have probably already guessed, is that the AVR-4308CI what I had hoped it would be over a year ago. At an MSRP of $2,499, this is definitely on the higher end of the receiver spectrum. However, when you consider what it brings to the table and how much separate components that do all of these things would cost, it may actually be a bargain. Kudos to Denon for putting out a product that is an excellent achievement in the audio/video receiver category.".

"Some Responses:
written by Gabe , July 25, 2008

Sorry for the delay in answering these questions...

Internet Radio Stations:
Yes, you can customize a list of Internet Radio Channels and play them without having a computer in the path. It is much easier to CREATE the channel list on a computer, but once there, the channels stream directly.

THX Certification:
Well, I don't know that I would say this is a deal breaker. THX certification simply means that the component meets a certain set of standards and features as defined by the THX certification, and has been tested to meet these requirements by THX. Just because the Denon doesn't have that label doesn't mean it doesn't meet those standards. It likely means that Denon simply didn't want to pay to have this unit certified. I certainly would NOT rule a component out of my short list for a home theater simply because it is not THX certified. Again, it will be about what sounds/looks good to you with your own eyes and ears!

4 Ohm loads:
This receiver can definitely connect to speakers rated for 4 Ohms. There is a protection circuit that will trigger and shut the unit down if you try to drive the speakers to hard and the receiver heats up as a result, but I would imagine you need to drive them very hard for a very long time and have bad ventilation for this to occur."

Oh boy.
Yes some AVR's can drive 4 ohm speakers, but SQ drops significantly. Please don't get hung up on needing huge amounts of watts for every channel. A watt is not a watt. Think about a car stereo. Most say 4 x 50 watts. My little 30wpc A/D/S 30 x4 car stereo amp smokes any, and all car stereo head units. So the answer to is 130watts of receiver equal to 130 watts of amp. A huge no way.

Bernal

cnh wrote: »

I would get the Adcom 7705, the 5 channel and let your Denon handle the last two channels of the 7.1, you really don't need to worry about those back channels that much. And get the best sub you can afford? Depends a lot on the size of your room.

Just my opinion.

cnh

Ok. I understand.:)
Thank you. Final question: the ADCOM GFA-7705 is the best option? I can recommend other options makes and models.
Thank you

B.

CRESCENDOPOWER

Bernal wrote: »

Ok. I understand.:)
Thank you. Final question: the ADCOM GFA-7705 is the best option? I can recommend other options makes and models.
Thank you

B.

You'll need some type of adapter cord for the 20 amp AC plug to fit into a 15 amp socket. I am not a professional electrician, and do not know how safe this application will be.
Disregard if you have 20 amp outlets, and service.

Bernal

CRESCENDOPOWER wrote: »

You'll need some type of adapter cord for the 20 amp AC plug to fit into a 15 amp socket. I am not a professional electrician, and do not know how safe this application will be.
Disregard if you have 20 amp outlets, and service.

Thank you. Still not decided. I got online and connector 20 amp.