Question 1

How to connect a subwoofer to a NAD 710 amplifier?

Accepted Answer

The NAD 710 does not have a dedicated RCA or XLR output for subwoofers, but you can still connect a subwoofer using its available speaker outputs on the rear terminals. Depending on the type of inputs on your subwoofer, two solutions are possible.

First solution: via the speaker-level inputs of the subwoofer (recommended)
If your subwoofer has speaker-level inputs (high power terminals), this is the simplest and most direct solution. Connect the speaker cables from the NAD 710 (the LEFT+ and LEFT- terminals for the left channel, RIGHT+ and RIGHT- for the right channel) to the corresponding speaker inputs of the subwoofer. The subwoofer will automatically filter the low frequencies. Important: respect the minimum impedance of 4 ohms indicated on the NAD 710 amplifier. Use a quality speaker cable, 16 gauge or higher, for optimal connection.

Second solution: speaker to RCA converter
If your subwoofer only has line-level RCA inputs, you will need to use a speaker-level to RCA signal converter (available commercially). Connect this converter to the speaker outputs of the NAD 710, then connect the RCA outputs of the converter to the line inputs of the subwoofer. This solution offers more flexibility but introduces an additional signal conversion step.

Essential settings after connection
Once connected, adjust the volume of the subwoofer according to your listening preference. Use the crossover (frequency filter) of the subwoofer to set the frequency at which it takes over from your main speakers. A typical setting is between 80 and 120 Hz depending on your front speakers. Test different positions of the subwoofer in the room to achieve a good bass balance.

Question 2

What does the change of the NAD C320BEE amplifier's indicator light from orange to red mean and how can this problem be resolved?

Accepted Answer

The change in color of your NAD C320BEE amplifier's indicator light from orange to red generally indicates a malfunction or activation of the device's protection mode.

Possible causes of the red light:

Overheating: The amplifier may go into protection if the internal temperature is too high. Ensure that the device is well-ventilated, with no obstructions around it and away from heat sources.
Speaker connection issue: A short circuit, incorrect wiring, or too low speaker impedance can trigger the protection mode.
Power or source issue: Check that the power cables and audio sources are properly connected and in good condition.

Steps to resolve the issue:

Turn off the amplifier and unplug it from the electrical outlet.
Check all cable connections, especially those of the speakers, for any short circuits or incorrect connections.
Allow the device to cool down for a few minutes if you suspect overheating.
Plug the amplifier back in and turn it on to see if the light remains red.
If the problem persists, try connecting the speakers one by one to identify any potential failure.

If after these checks the light remains red, it may indicate an internal fault requiring specialized technical intervention.

Question 3

Why does my NAD T750 amplifier turn off when selecting an audio channel?

Accepted Answer

If your NAD T750 amplifier turns off automatically when selecting an audio channel, it generally indicates that the built-in protection circuit has been activated. The T750 is equipped with safety protections that automatically put it into standby mode in case of a detected fault, especially during input changes or surround mode. Here’s how to diagnose and resolve this issue.

First, check the speaker connections. Make sure all speaker cables are properly connected to the amplifier terminals (before plugging in the device). The NAD T750 has short-circuit protection that triggers automatic shutdown if one or more speaker cables touch the ground or if two cables come into contact. Check that the speaker cables are not frayed at the connections, that there are no exposed wires, and that no bare conductor is touching the back panel or another connection.

Check the impedance of your speakers. The T750 requires a minimum impedance of 4 ohms for the front speakers and the center channel, and a minimum of 6 ohms for the surround speakers. If your speakers have a lower impedance (for example, 2 ohms) or if you connect multiple speakers in parallel without checking the total impedance, the overload protection will trigger the automatic shutdown. Refer to your speakers' documentation to check their exact impedance and calculate the total impedance based on your setup.

Ensure proper ventilation. The T750 amplifier weighs 10 kg and generates heat during operation. If the ventilation openings (side and rear vents) are blocked by fabric, dust, or if the device is placed too close to a heat source, the thermal protection circuit may trigger during input changes that require more power. Place the amplifier on a flat, rigid surface (not on carpet or a soft surface) and leave at least 10 cm of free space around the device for air circulation.

Test with another audio source. Try selecting another input channel (for example, switch from Video 1 to CD) to determine if the issue occurs with a specific input or consistently. If the shutdown occurs only with a particular input, the problem may be related to the source (the cable for that input may be faulty) rather than the amplifier itself. Disconnect the faulty source and test again.

Reset the amplifier. Press the POWER button located on the front panel to put the device into Standby mode. Wait a few seconds, then press again to restart it. This resets the protection circuits. During this reset, do not change the audio channel to avoid retriggering the protection. Once the device has restarted and stabilized (wait at least 30 seconds), test the channel selection very slowly, allowing a few seconds between each change.

If the problem persists after these checks, it may indicate a fault in the thermal protection circuit or the overload detection system of the T750, which can only be repaired by an authorized NAD service technician. The NAD T750 contains complex electronic components with no user-accessible parts, so any further intervention should be entrusted to a qualified professional.

Question 4

How to solve the issue of the screen not turning on for the NAD T750 amplifier?

Accepted Answer

If the screen of your NAD T750 amplifier does not turn on, here are several steps to follow to try to resolve this issue:

1. Check the power supply

Make sure the amplifier is properly plugged into a functioning power outlet.
Test the outlet with another device to confirm it is providing electricity.

2. Check the power cable

Ensure that the power cable is not damaged and is properly connected to both the amplifier and the wall outlet.
If possible, try another compatible cable to rule out a faulty cable issue.

3. Check the power switch

Make sure the power switch of the amplifier is in the

Question 5

How to connect the analog output of the NAD C325BEE amplifier to digital speakers Boozze II?

Accepted Answer

The NAD C325BEE is an audio amplifier with analog outputs (RCA) that are not directly compatible with digital speakers like the Boozze II. To make this connection, it is necessary to use an analog-to-digital signal converter.

Steps to connect your NAD C325BEE amplifier to Boozze II digital speakers:

Identify the amplifier outputs: Use the available analog RCA outputs on the NAD C325BEE.
Choose a suitable analog-to-digital converter (ADC): This converter must have RCA inputs and a digital output compatible with the input of the Boozze II speakers (for example, USB, optical Toslink, or coaxial).
Connect the cables:
- Plug the RCA cables from the audio output of the amplifier to the RCA inputs of the converter.
- Connect the digital output of the converter to the corresponding input of the Boozze II speakers with the appropriate cable.
Power the converter: Ensure that the converter is properly powered, as it requires a power source to operate.
Adjust the volume: Before turning on, set the amplifier volume to a moderate level to avoid any risk of damaging the speakers.

This method allows you to transmit the analog audio signal from your NAD C325BEE to digital speakers by converting the signal into a compatible format. Be sure to choose a high-quality converter to preserve sound quality.

Question 6

How to connect the NAD C270 amplifier with the NAD C160 preamplifier for low volume listening?

Accepted Answer

Connecting the NAD C160 preamplifier with the NAD C270 power amplifier is an ideal setup to optimize sound quality, especially during low volume listening. The C270 is a class AB stereo amplifier capable of delivering 2 x 150 W at 8 ohms, greatly benefiting from the precise volume control offered by the C160.

Connecting the devices: Use a quality RCA cable to connect the audio output of the NAD C160 preamplifier to the fixed inputs (FIXED IN) of the C270, identified by color-coded RCA terminals (red for the right channel, black/white for the left channel). Connect the left and right outputs of the C160 to the corresponding jacks. The fixed inputs directly link the signal to the amplification circuits without intermediate stages, preserving the purity of the signal.

Optimal setting for low volume listening: For comfortable low-level listening, first set the C160 preamplifier to the desired volume level, then use the gain control of the C270 (or leave it at a mid-level). This approach utilizes the full adjustment range of the preamplifier and avoids limiting the volume control. Ideally, the volume of the C160 should be used in its upper range (beyond 11 o'clock) for fine adjustments and better sound dynamics.

Cabling and audio quality: Prefer quality shielded RCA cables to minimize interference and signal loss on the link between the two devices. Good connection quality is crucial to preserve signal clarity, especially during low volume listening where background noise becomes noticeable.

Trigger activation: The C270 has a 12 V trigger input that allows synchronization of the power on and off of the C270 with your C160. This handy feature avoids having to operate two separate power buttons and is activated by setting the rear selector of the C270 to AUTO.

Important precautions: Ensure that the C270 amplifier has adequate ventilation to prevent overheating risks. Before any connection, turn off both devices. Also, use compatible speakers (minimum 8 ohms recommended for prolonged use) for optimal performance and maximum lifespan of your audio equipment.

Question 7

What is the output power of the NAD C270 at 8 ohms?

Accepted Answer

The NAD C270 is an audio amplifier that delivers an output power of approximately 120 watts per channel at an 8 ohm load. This specification corresponds to the continuous nominal power that the amplifier can provide stably to 8 ohm speakers.

It is important to note that:

Power may vary slightly depending on usage conditions and the quality of the power supply.
For speakers with a different impedance, such as 6 ohms, the output power may be higher, but this also depends on the design of the amplifier.
It is advisable not to push the amplifier to its maximum power to avoid any distortion or damage.

In summary, the value of 120 watts at 8 ohms is a reliable indication of the power capability of the NAD C270 under standard conditions.

Question 8

What is the output power of the NAD C270 amplifier with a 6 ohm load?

Accepted Answer

The NAD C270 amplifier is a stereo power amplifier designed to provide appropriate power depending on the impedance of your speakers. Contrary to what might seem logical, the output power increases as the impedance of the speakers decreases.

According to the official specifications of the NAD C270, the amplifier delivers a power of 120 watts per channel at 8 ohms. With a 6 ohm load, which is an acceptable impedance (the amplifier supports a minimum of 4 ohms in stereo mode), the output power will be greater than 120 watts per channel, generally estimated between 140 and 160 watts per channel, although NAD does not specify an exact value for this impedance.

The amplifier features built-in thermal protection and NAD's proprietary Soft Clipping circuit that gently limits audio output in case of overload. However, when using low impedance speakers (like 6 ohms), it is crucial to ensure adequate ventilation by clearing the ventilation openings at the top and bottom of the unit, as thermal dissipation increases significantly.

For the best experience, prefer 8 ohm speakers, which provide optimal balance. If you are using 6 ohm speakers, be careful not to overdrive it at very high volume for extended periods, and regularly check that the amplifier does not overheat excessively. In bridge mode (mono), the amplifier can deliver about 300 watts at 8 ohms if you need more power in the future.

Question 9

Is the NAD C270 amplifier compatible with 6-ohm speakers?

Accepted Answer

Yes, the NAD C270 amplifier is fully compatible with 6-ohm speakers. According to the manufacturer's technical specifications, this stereo power amplifier can operate with speakers that have a minimum impedance of 4 ohms when a single pair of speakers is connected. 6-ohm speakers comfortably fall within this compatibility range.

With an impedance of 6 ohms instead of 8 ohms, the amplifier will provide more current to your speakers. This means higher output power but also slightly increased thermal dissipation. That is why it is important to ensure adequate ventilation of the device by keeping the ventilation slots on the top and bottom of the NAD C270 clear, and not installing it in a confined space such as a bookshelf or closed cabinet.

The amplifier has built-in protection devices that automatically intervene in case of thermal overload or too low impedance. If you regularly listen at high levels that may heavily tax the amplifier, you can activate the Soft Clipping™ feature to limit energy peaks and minimize the risk of overload. This system generates slight signal clipping but preserves the stability of the amplifier during intensive use.

In summary, using 6-ohm speakers with the NAD C270 is perfectly safe and within the manufacturer's specifications. Just ensure proper installation conditions (correct ventilation) and monitor listening levels for optimal and durable operation.

Question 10

Is the NAD C270 compatible with the Elipson Prestige Facet 24F speakers?

Accepted Answer

Yes, the NAD C270 amplifier is compatible with the Elipson Prestige Facet 24F speakers. Here are the key points to consider:

Power: The NAD C270 delivers about 80 watts per channel at 8 ohms, which is generally sufficient to properly drive the Elipson Prestige Facet 24F speakers without the risk of underpowering or excessive distortion.
Impedance: The Elipson Prestige Facet 24F speakers have a nominal impedance of 8 ohms, which perfectly matches the expected output of the NAD C270, ensuring good electrical compatibility.
Sound quality: Both brands are known for their audio quality, so the pairing should provide clear, detailed, and balanced sound, ideal for hi-fi listening.

In summary, you can confidently use the NAD C270 with the Elipson Prestige Facet 24F speakers for a quality audio experience.

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