Basic Room Correction for your Speakers

frequencyIn this short tutorial, I’d like to explain a simple but effective method to achieve basic room correction when using a Windows computer as playback source.
Basically, several filters are applied to the digital audio signal before it is forwarded to the amplifier and speakers to “ameliorate unfavorable effects of a room’s acoustics”. This can sigificantly reduce or even elimiate unwanted vibrations due to bass, improves the overall listing experience and even reduces the amount of sound that is emitted through the walls.

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Nubert NuPro A200 Speakers


The Nubert NuPro A200 are active bookshelf speakers (stereo) and can therefore be connected to a TV or computer directly without any additional amplifier. Each of the two speakers has its own integrated amplifier and digital signal processor. The speakers can either be connected via analog line-in, optical Toslink or digital SPDIF. Besides, there’s also a USB-DAC, which allows to connect the speakers to a computer via USB. This is particularly useful if the soundcard on your computer/laptop isn’t that good.

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Raspberry Pi Server


Since I had a spare Raspberry Pi 2 lying around, I figured I could use it as a webserver. The idea is to host a simple webpage and implement a functionality to wake and shutdown devices in the LAN from the Internet (Raspberry acts as an intermediary). Besides, the Raspberry shall also monitor the state of some devices in the network (e.g. my Synology NAS).

Due to the lack of computational power and fast memory, the Raspberry is certainly not suitable for services that require highspeed I/O capabilities such as large databases, but for personal use it will do just fine!

What makes the Raspberry Pi particularly interesting to be used as a server – apart from its affordable price tag – is the low power dissipation of just 2W. So even if you keep it always on, it won’t be heavy on your pocket. Besides, it is fanless and thus inaudible during operation.

Here is what you are going to need for the following tutorial:

  • a Raspberry Pi (obviously), I recommend the version 2 or 3
  • a micro USB power supply with at least 700mA
  • a micro SD card with at least 2GB
  • an Ethernet cable

You can get all of this for less than 50 bucks. Besides, you will need a monitor with HDMI and a keyboard for the initial setup.

Now let’s get started!

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JBL Synchros S500 Headphones


The JBL Synchros S500 are closed over-ear headphones. They can be used together with any device with a 3.5mm audio jack, no preamplifier required. One particularly nice feature is the integrated digital signal processor to improve the audio quality, which can be activated on demand (requires batteries).
I was able to pick these headphones up for just 80 bucks, a bargain when you consider the steep MSRP of 280$! Let’s have a look what they have to offer.

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