My Denon AVR 3903 has a problem in that when you turn it on, first thing in the morning, the volume level is really low then after 30 to 45 minutes later BAM the volume kicks in to where it should be.

To add a 2-channel amplifier to your Denon AVR 2307ci receiver, you can follow these general steps:
1. Determine the amplifier connection type: Check the specifications of your 2-channel amplifier and identify the available input and output options. Common connection types include RCA (analog) and speaker wire (for binding posts or terminals).
2. Identify the pre-out connections on your Denon AVR: Locate the pre-out connections on the back of your Denon AVR 2307ci receiver. These are typically labeled as "Pre Out" or "Preamp Out" and may be color-coded. You will need to find the pre-out connections for the front left and right channels.
3. Connect the RCA cables: If your amplifier has RCA inputs, use RCA cables to connect the pre-out connections of the Denon AVR to the corresponding inputs on the amplifier. Connect the left channel pre-out on the Denon to the left channel input on the amplifier, and do the same for the right channel.
4. Connect the speaker wires: If your amplifier uses speaker wire connections, connect the front left and right speaker outputs of the Denon AVR to the corresponding inputs on the amplifier using speaker wire. Make sure to observe the proper polarity (positive and negative) when connecting the wires.
5. Configure the Denon AVR settings: Access the setup menu of the Denon AVR by using the remote control or the front panel display. Navigate to the audio settings or speaker configuration section. Look for an option to enable "Preamp Mode" or "Preamp Outputs." Enable this option to ensure that the front left and right channels are redirected to the pre-out connections.
6. Set the amplifier to the correct input: If your amplifier has multiple inputs, select the input that corresponds to the connection from the Denon AVR.
7. Adjust volume and settings: After completing the connections, you may need to adjust the volume levels on both the Denon AVR and the amplifier. Use the Denon AVR as the primary volume control and adjust the amplifier's volume accordingly.
It's important to consult the user manuals for both your Denon AVR 2307ci and the 2-channel amplifier to ensure proper setup and compatibility. If you're uncertain about any specific steps or settings, it's advisable to consult the manuals or reach out to Denon customer support for assistance.

This video MIGHT help a little

Connect the 3.5mm cable to the iPod headphone output and the two RCA plugs into any unused analogue audio input on the Denon AVR 1803. Then choose the appropriate input on the Denon, press play and enjoy the music. Be careful about volume. Start with the volume on the iPad low and adjust to suit.
Cheers, Don.

I'm not familiar with your unit. However, go to systems surround set up and turn up volume for those surround speakers you speak of.

If yourt subwoofer has a Standby setting, turn it OFF. Have the sub stay on whenever it has power.

Maybe the audio amplifier IC are fried and need to be replaced

My Pioneer VSX-36TX (circa 2002) does the same thing. Modern AVR's count up from minus something to 0db and go just a few db higher into 'plus' territory. It seems arbitrary but that's how it is.

Ask yourself this: who ever really turned the volume knob up to maximum on any amp on purpose, and had speakers survive it? In other words, why have all that capacity on a potentiometer if you never use it?

Little known fact: With that in mind, Bose Corp actually designed a product that intentionally used the full physical travel of a volume control - the Bose Acoustic Wave Music System.

try switching the remote to operate zone 2 and turn the zone 2 volume level up higher

if the volume control as been forced the conection in the switch as jammed +vol .this is usually a small preset under the knob the right hand one.pull the knob off pulling straight as not to bend spindle some time's the two presets are visable.a cotton bud dipped in spirits could solve your problem but some times you need to pull the top of the preset .it might need removing and replacing . this could be a more complicated problem caused by a variety of things here are a few,dry joints,cracked pannel .hope some of this helped . if in dire straits skype me farr64

There is a problem in one of the output channels of the amplifier. That is the only reason it will do this. I work at an authorized Denon service center and have seen this problem several times, but it has never been the same thing that causes it. It has always resulted in extensive troubleshooting to find the problem. One time it was a capacitor in the pre-driver circuit for one of the channels, another time it was a transistor in the same type of circuit. I can not remember all the other causes. But without the proper tools and the knowledge of how to troubleshoot an amplifier circuit you will never figure it out.

Since this is an older model, more than 3 years old, it is no longer under warranty. They get a 2 year warranty from Denon. You can take it to any service center that works on stereo equipment and they should be able to fix it for a reasonable fee. Probable around $125 to $150 depending on their rates. It may seem like a lot, but it is much cheaper than buying a new one.

Since this is really the only option for you, unless you have the tools and knowledge, a FixYa! would be much appreciated and appropriate.

If you would like to troubleshoot it yourself, let me know, I have the service manual in PDF and can email it to you if you like and help you with troubleshooting it. But be aware, it is not an easy job.

Dave

muting is on switch off muting.
---volume control is in low level------turn volume up.
------input signal of audio source not selected------select your audio source.