pre amp

A preamplifier (preamp) is an electronic amplifier that prepares a small electrical signal for further amplification or processing. They are typically used to amplify signals from microphones, instrument pickups, and phonographs to line level. Preamplifiers are often integrated into the audio inputs on mixing consoles, DJ mixers, and sound cards. They can also be stand-alone devices.
A preamplifier is often placed close to the sensor to reduce the effects of noise and interference. It is used to boost the signal strength to drive the cable to the main instrument without significantly degrading the signal-to-noise ratio (SNR). The noise performance of a preamplifier is critical. According to Friis's formula, when the gain of the preamplifier is high, the SNR of the final signal is determined by the SNR of the input signal and the noise figure of the preamplifier.
In a home audio system, the term 'preamplifier' may sometimes be used to describe equipment which merely switches between different line level sources and applies a volume control, so that no actual amplification may be involved. In an audio system, the second amplifier is typically a power amplifier (power amp). The preamplifier provides voltage gain (e.g., from 10 mV to 1 V) but no significant current gain. The power amplifier provides the higher current necessary to drive loudspeakers.
Three basic types of preamplifiers are available:
current-sensitive preamplifier
parasitic-capacitance preamplifier
charge-sensitive preamplifier.

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  1. splnter

    Wanted Simaudio Moon Lp5.3 Turntable Pre amp.

    I'm after one of these, as these ones have XLR outputs. Many thanks. Ian .
  2. Kessel10

    New AVR + Amp setup

    Hello, My name is Ed and I was searching for some information about a home cinema setup with a good stereo setup. I am searching the internet en watching YouTube nonstop but I am getting a headache of all the information. I bought a powernode n330 two weeks ago second hands for 600euro. Now...
  3. W

    Phono (tube?) pre amp with tone controls?

    Hi all, My journey in short: stated out with avr 5.1, upgraded the system with an atoll in200 for 2 channel listing streaming via my avr and lately bought a turntable. (speakers were q acoustics > monitor audio silver and latest upgrade Arendal 1723 s towers which I just LOVE. My room is not...
  4. K

    ATC SCM40A Exposure pre amp pairing

    I'm am considering a Exposure preamp pairing with scm40 active speakers specifically the 5010 model. Does anyone have any experience with Exposure preamp pairing with ATC active speakers and is able to comment on the sq?
  5. bowtie13

    Question Triggers and IR receiver

    My AVR got a little bid old, so bought an pre amp as an upgrade to again support all the codecs. I connected it to the ext. in on my old receiver to just use the amplifier. To later when I have budget again buy a dedicated amplifier. Now the the old receiver needs to turn on when I turn on the...
  6. Steve@Rae

    Question Pre amp and bi amp control

    I’m thinking of setting up a power amp to run the front three speakers with the receiver (Denon AVC 3800H) then using the receiver amp to power the height and rear speakers I want to bi-amp the front three speakers as I’m also buying Dali Rubikon 6 floor standers and Rubikon centre speaker all...
  7. Rocketrazor

    Question Pre Out Amp Query - Pop and Noise from Speakers on Pre Amp is on

    Evening All, I have a Marantz SR7015 and audizio AD200A (link below if it works) Audizio AD200A 2-Channel HiFi Stereo Amplifier with Bluetooth Streaming and Subwoofer Output - 200W Aluminium I'm using the AD200A to power the rear atmos ceiling speakers. When I first cabled it all up I had a...
  8. I

    Phono pre amp with headphone socket

    I am looking for a phono pre amp with a headphone socket so I can listen to records without using my amp. I have looked at a few and the Fosi Audio Box X4 fits the bill. Have any members had experience of this pre amp or any other recommendations in around the £100 mark. I am currently using a...
  9. Jaded1

    Pre Amp and Power Amp question (Marantz)

    I currently own the KI Pearl Lite which has since been tweaked and rebranded to the PM8006. These units have a power amp only option as well as being a combined amp. My question is if I purchased a PM8006 and used one as the main amp and another as the power amp am I likely to receive an...
  10. R

    Bluesound Node 130 Pre amp?

    Has any forum member used their Node as a pre amp into a power amp? I'm giving mine a whirl at the moment and using the volume control on the iPad. Seem to work fine. any thoughts?
  11. M

    Pro-ject pre amp 2 buzzing

    Wonder if anyone can give me a hand solving the humming getting from Pro-ject 2 pre amp connected to Nad C326BEE. Everything is disconnected from amp including turntable but get humming/buzzing as soon as press disc button on amp, which get louder if volume turned up. I've tried grounding wire...
  12. G

    Technics 1210 MK2 sending audio to amplifier via cat 5

    Hello. I am trying to get the best sounding results from my vinyl collection whilst making do with what I have. I have spent years collecting all sorts of gadgets and gizmos to help me achieve my audio visual needs and have lots lying around. Currently my Technics 1210 is mounted on a floating...
  13. silouette

    Is it possible to connect Legacy Pre amp to Smart HDMI Tv

    Have an Old Rotel 1068 pre which I was able to connect to my Old Kuro via video lead. But now having bought a new Panasonic lz 2000 it really only has HDMI inputs and single input labelled AV ? Is it possible to connect to the TV with some sort of HDMI adaptor and if so where to plug it into...
  14. silouette

    Rotel 1068 pre amp advice

    Hi There, Recently invested in a new Panasonic OLED. But the only connections are virtually all HDMI. Is there anyway of using a HDMI Adaptor to connect to preamp so that I can just set up the surround sound parameters as of course the Rotel is Old School and just hasloads of various phono style...
  15. G

    Help required for new AV system

    Morning, I am a bit lost and just seeking some advice. I currently have a Denon X6300H driving everything for my home cinema. I have Fyne 502 floor standing fronts, a Fyne 500C centre speaker, 2 x Fyne 500 side/rear speakers and a BK XXLS400 DF Subwoofer in a conventional 5.1 setup. The room is...
  16. Helix Hifi


    Considering this…. Wondering how to connect sub to it. I assume using the second speaker terminals. I see they’ve got pre out for pre amp too. Is this correct. Or am I better of looking at Yamaha AS1200. I seem to have read you need to be careful connecting sub to it. Same with Marantz Model...
  17. leobornlion

    Help Complete My B&W 702 System

    Hello, I am looking to complete my 5.0 system. It currently has B&W 702 S2 for L/R and HTM71 S2 Center. The surrounds R51M Klipsch. This was an upgrade from R-26FA and R52C. I used to have a Denon S750H which was struggling to keep up the new B&W 702 S2s. So I upgraded to denon X6700H. It...
  18. stblob

    How to connect av pre amp to power amp?

    Just a silly question really, I do know how to connect but what cable do you use? I don't seem to be able to find a multi way RCA cable!! Any pionters? Or do I use several 2 way cables? Thanks guys
  19. DT79

    Pre amp with home cinema/theatre bypass

    Does anyone know of any pre amps (or integrated amps with pre-outs for that matter) which have a (properly implemented) home cinema/theatre by-pass feature? I recently discovered that I get far better results for stereo in my home cinema system by using my Beolab 8000 front LR speakers on their...
  20. M

    Vintage Leak Point One Stereo Pre Amp.

    I have recently rediscovered my late fathers vintage pre amp. I cleared it from his house when he passed away some 12 years ago and it has been stored in my garage since then. I have no idea if it still works and have no way of testing it. I seem to remember it being powered by the main...
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