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I Was Told I Don’t Need a DSP

need a dsp

I Was Told I Don’t Need a DSP

Since I’m Running Passive Crossovers

tools
The right tools for the job.

One thing that affects us all at some time is advice that is misleading, completely wrong, or half correct. A recent conversation with a client brought up a question that can be translated to “Which tools does my mobile audio system need to meet my goals?”. No, this isn’t about tools to install your equipment. Let’s get into the tools used to adjust the electronic signals to suit our goal of good sound quality.

Do I need a DSP?

Students of Mobile Audio
Students of Mobile Audio
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What are passive crossovers? What do these have in common with a Digital Signal Processor? 

Before I get into that let’s look at a list of some of our tools we need for good sound and reliability within an audio system:

Tools of the Trade (within a mobile audio system)

  • Filters – low pass, high pass, shelving, etc.
  • Level controls
  • Equalizer
  • Tone controls
  • Bass boost
  • Signal delay aka time alignment
  • Phase control
  • Polarity switching

The Basic Reason for Passive Crossovers

Diagram of speakers connected to an amplifier
Diagram of speakers connected to an amplifier

Small speakers need to have the bass signals removed to reduce distortion and to protect them from damage. Do we need a DSP to do this? Certainly it is a powerful option. Many DSP solutions have the entire list of audio tools in one package.

Back to passive crossovers. At the most basic level they will have a high pass filter to protect a small speaker, usually a tweeter. As designs of passives scale up in complexity we next add a level control to reduce the loudness of the tweeter, in relation to a mid-woofer. This is a valuable tool to have as there are so many places we can install tweeters into a vehicle that adjusting levels is a must. Also, it may be necessary to bring down the loudness of the tweeter in relation to the woofer, such as in a 2-way component speaker system. 

Four Divisions of Sound We Hear, Color Shaded

As frequency goes up we want no abrupt changes. The woofer and tweeter transition normally happens in the midrange. A passive crossover and a DSP both offer ways to ensure that transition happens smoothly. 

Dividing the Signal

Why would the signal need to be divided? What signal am I referring to? Let’s look closer at the diagram pictured above. In the upper left corner the boxes represent passive crossovers, with blue lines representing the speaker wires carrying the output signals from the amplifier(the red box).

passive component speaker system diagram
passive component speaker system diagram

Ok. Two amplifier channels. Four speakers. The next vital reason for passive crossovers is to split an amplifier output channel to allow the use of 2 or more speakers. Does this sound like a familiar concept from your experience of audio systems? 

Ok, but do I NEED a DSP??

Filters, level controls, equalizers, delays, and more. If I may make an analogy, there’s a lot that’s been done with very basic woodworking tools. Give a skilled builder a jigsaw and some sawhorses and you might be stunned at the quality and creativity of mobile audio system that can be constructed. Add more tools, such as a router table with a variety of bits, a table saw with a fence to cut perfect straight edges, and the build time is reduced and precision scales up rapidly. 

When we can add more tools to the mobile audio system before and after the amplifier the potential to enhance the experience can be enormous. A DSP can be thought of as a complementary array of tools to give the system designer / builder many more options.

I want to mention also, as it can’t be ignored if you ever intend to master mobile audio systems, the undeniable influence of the interior of the vehicle on the sound system. Reflections happen off of every surface and we sit very close to all surfaces inside our vehicles. We can’t throw the toolbox at this problem, but in the “Passive Crossover vs DSP” debate it’s obvious the DSP route can give us a big advantage.

Control

Flexibility

Do not underestimate the power. Do you need a DSP? I want you to let me know what questions you have from this article. Leave a comment below and subscribe to get updated of future posts.

Barry Schanz
Rubyserv
Schedule a Meeting Now
sales@rubyservsales.com

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Digital Signal Processors – What and Why?

DSP Software on MS Windows

We want you to have an outstanding audio experience in your vehicle, and the speakers and amplifiers form a solid foundation. What about when you want to take it to the next level? What do you need to do to go all the way? You will need a Digital Signal Processor, or DSP for short.

Have you wondered any of the following?

  • How do I add amplifiers to my (Bose, Sony, Alpine, etc.) system the right way?
  • I want good imaging and staging. What do I need?
  • Can my car sound as good as my home stereo?

 

imaging and staging Rubyserv
Imaging and Staging – Put the band on the dash

The folks at BestCarAudio.com have put up an excellent article to introduce DSP. Here is a teaser:

A Hostile Environment

If we were to take a full-range home speaker into an open field and measure the frequency response, we’d see a fairly flat and smooth response curve. If you take that same speaker into a small room and measure the response again, you will see peaks and dips at various frequencies. This change in frequency response is not caused by the speaker, but by the room itself.

Digital Signal Processors Take Your Audio System To The Next Level

DSP Software on MS Windows
DSP Software on MS Windows

Let Rubyserv help you decide if a DSP is right for you. Most of the software requires a laptop or tablet running Microsoft Windows. You will also want a calibrated microphone and some form of audio analyzer to make measurements. We use Room EQ Wizard and recommend Dayton Audio microphones.

Barry Schanz
www.rubyservsales.com
701-620-1124
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