Live PA and Mixers

Black Friday - Live PA & Mixers

What is a PA system? 

PA stands for Public Address which refers to projecting sound louder than talking or an acoustic instrument could to large numbers of people. These systems are used in live music settings and consist of loudspeakers, amplifiers, mixers and microphones. 

What is an Audio mixer? 

An audio mixer or mixing console is and electronic device which mixes, balances and combines different audio signals such as microphones, instruments, synthesisers and even previously recorded material (often referred to as playback). The modified sound signal is then sent to the output which is then transmitted and amplified through a sound system. Effects and ambience can be added, EQ and stereo imaging are then balanced, and the output is sent to the monitor speakers. 

What is a DI Box and what does it do?  

A Direct Injection (DI) unit converts unbalanced, high-impedance signals into balanced, low-impedance signals. This allows you to insert an instrument signal directly into a preamp, mixer, or recorder at the right impedance for cleaner sounds and less noise.  

Do you need a DI Box?  

DI boxes are used to convert an unbalanced, high impedance, instrument or line level signal to a balanced, low impedance, mic level signal suitable for connecting to a mixing desk or interface microphone XLR input. Essential for connecting your instruments such as guitars, keyboards or playback devices for recording or live applications.   

Available in active or passive versions as a general rule of thumb an active DI box is best suited to passive instruments such as an acoustic guitar and a passive DI box best suited to connecting active or electronic inputs such as a keyboard. But either option can work with a high impedance input.  

Which DI Box do you need?  

The advanced signal routing capabilities and higher headroom make Active DI boxes excellent choices for electric guitars and other passive instruments and won’t pick up the background noise that a microphone will.  

What is a Passive DI Box?  

Passive DI boxes such as the Dual Passive DI Box by Lambden Audio mostly use a balun audio transformer to convert impedance, electrically separate windings in the input and output stages isolate ground-level voltages and eliminate ground loops.  

Simple, durable, and reliable, they only contain a transformer and a few resistors and remove the existing static from your sound. The simple circuitry easily isolates the signal from your instrument and converts it into XLR, with no noise added. The longevity of Passive DI boxes is incredible, and you can guarantee that they won’t let you down when you need them.  

You’ll never have to worry about battery life as they use the power from your instrument, no matter the length of your cord. As they don’t require power to operate, they attenuate signals instead of amplifying them.  

What is an Active DI Box?  

Active DI Boxes such as the ADI1 Active DI Box by Lambden Audio require a power source, some have a built-in preamplifier, some use 9V batteries and some have an AC power supply, but they all produce a stronger signal than a passive DI box without the signal level dropping.  

They provide a direct injection of electricity into the audio signal and are normally best paired with passive instruments with low output and high impedance to boost higher frequencies. The lower the instrument’s output the more effective an active DI box will be.   

The most common application for them is in the studio for instruments such as an electric bass with a passive pickup or a guitar with passive pickups, an acoustic guitar that does not have a battery powered output and can even be used with condenser microphones.