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SOUND HANDBOOK
Hints and advices for car sound builders using
DLS amplifiers and speakers
Page
1
2 - 3
4 - 5
6 - 8
9
10 - 13 Installation
14 - 20 Building speaker boxes
21
22
DLS Svenska AB
P.O. Box 13029, SE-402 51 Göteborg, Sweden
Tel. +46 31 84 00 60
Fax +46 31 84 40 21
E-mail: info@dls.se
www.dls.se
CONTENTS:
Introduction
Formulas and facts
Amplifier facts
Passive crossover filters
Cabling
Enclosure examples
Some useful tables
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Summary of Contents for DLS SOUND HANDBOOK
- Page 1 SOUND HANDBOOK Hints and advices for car sound builders using DLS amplifiers and speakers CONTENTS: Page Introduction 2 - 3 Formulas and facts 4 - 5 Amplifier facts 6 - 8 Passive crossover filters Cabling 10 - 13 Installation 14 - 20 Building speaker boxes...
- Page 2 DLS lay a great job in developing and refining the DLS AMPLIFIERS 2007: different products in order to give the market the best...
- Page 3 DLS SOUND HANDBOOK - FORMULAS AND FACTS FORMULAS MEASURE CONVERSION It's easier to understand some parts in this book if The following relation between some units are you know some of the formulas on this page. They useful to know of.
- Page 4 DLS SOUND HANDBOOK - FORMULAS AND FACTS DECIBEL - dB CONNECTING RESISTORS The formualas below is valid when connecting dB is a unit used to describe a realation. It´s used to resistors and inductances in series or in parallel. describe an amplification as well as an attentuation.
- Page 5 DLS SOUND HANDBOOK - AMPLIFIER FACTS DLS ULTIMATE AMPLIFIERS Number of channels Power output in 4 ohm 2x45 W 2x85 W 2x150 W 4x85 W 2x85 W 1x500 W 4x60 W 4x40W Power output in 2 ohm 2x80 W 2x145 W...
- Page 6 DLS SOUND HANDBOOK - AMPLIFIER FACTS DLS Performance CA 22 CA 23 CA 31 CAT 31 CA 41 CA 51 R.M.S. Power output at 13,8 Volts, 20 Hz - 20 kHz, all channels driven: Number of channels Power output in 4 ohm (0,1% THD)
- Page 7 DLS SOUND HANDBOOK - PASSIVE X-OVER FILTERS CROSSOVERS CROSSOVER EXAMPLES: (without conjugate compensation) The ideal speaker, able to reproduce all frequencies 3-WAY SYSTEM: from lowest bass to highest treble, is not yet invented. Instead we have to use two or more speakers where...
- Page 8 DLS SOUND HANDBOOK - PASSIVE X-OVER FILTERS PASSIVE 6 dB LOW-PASS PASSIVE 6 dB HIGH-PASS A 6 dB high-pass x-over filter consists of a capacitor. A 6 dB x-over filter has a 6 dB slope / octave. The The crossover frequency varies with the capacitor...
- Page 9 DLS SOUND HANDBOOK - PASSIVE X-OVER FILTERS PASSIVE 12 dB LOW-PASS PASSIVE 12 dB HIGH-PASS A 12 dB x-over filter has a 12 dB slope / octave. The difference between the passive 12 dB high-pass A 12 dB filter is a combination of a coil and a x-over filter and the low-pass filter is that the coil and capacitor.
- Page 10 DLS SC 2x1,5, SC 2x2,5 and SC 2x4 are the stan- DLS ULTIMATE signal cables are of balanced type dard two-lead speaker cables made of oxygen free and are often used by very critical listeners.
- Page 11 DLS SOUND HANDBOOK - INSTALLATION THE DC-FEED INSTALLATION Maximum fuse values of the main fuse for different THE HEAD UNIT cable sizes. The heart in a car stereo installation is the car ste- 6 mm (9 AWG) :25 A 10 mm...
- Page 12 DLS SOUND HANBOOK - INSTALLATION SPEAKER INSTALLATION An important part of the installation is of course the speakers. How they are installed varies from car to car and depends upon the possibilities in each type. The factory pre-made installation holes are not always ideal for other types of speakers than original.
- Page 13 On a DLS amplifier the centre speaker is connected dashboard. The best places for the speakers must in bridge mode between Left and Right channel. The be tested out in the respective car.
- Page 14 300 AMPLIFIER μF. advices of how to build a box. R- R+ L+ L- You will also find suitable box sizes for all DLS subwoofers. 300 μ F 300 μ F 1 2 3 1 2 3 1 2 1 2...
- Page 15 - The sound from the port can be out of phase line input of your amplifier you will achieve a tight compared with the sound from the speaker cone. Can and well-defined bass in your bass-box. (All DLS give a trailing sub sound. amplifiers have a built-in subsonic filter.)
- Page 16 DLS SOUND HANDBOOK SPEAKER BOXES SPEAKER CONSTRUCTION suspension BANDPASS BOXES In all bandpass boxes the speakers are hidden inside the box, all sound is coming out through the speaker cone ports. There are different types of bandpass boxes spider and they have in common that they are a bit more...
- Page 17 DLS SOUND HANDBOOK - SPEAKER BOXES 7:th order bandpass box Speaker mounted in a vented box playing into an- other vented box. All ports going out. What is valid for 6:th order boxes is also valid for 7:th order boxes. The difference is that this box gives a 6 - 10 dB peak at the tuned frequencies.
- Page 18 1 ohm. If you want an extra high class speaker cable choose Below you find different speaker wiring examples. any of the DLS SCP, SCK, SCKS, SC 4x1 or SC 4x1,5 cables. SPEAKER POLARITY CHECK. All speakers in a car audio system should be Two 4 ohm speakers in parallel connected in phase (the same polarity).
- Page 19 DLS SOUND HANDBOOK - TROUBLE SHOOTING GUIDE Installing car sound can sometimes cause 3. Problem: "Rumble" bass sound. problems. If you are not satisfied with the sound you could have made something wrong. - The box tuning is too low, make the F-3dB higher Some typical problems are described below with with a smaller box.
- Page 20 DLS SOUND HANDBOOK - SPEAKER BOXES BASS BOXES IN DIFFERENT TYPES OF CARS 1. SMALL CARS LIKE VW GOLF AND SIMILAR In this car type the bass box should be mounted with both speaker and port directed backwards. Alternatively booth speaker and port can be directed upwards. This way of mounting is valid also for half- combi car types.
- Page 21 You can´t use felt cloth or similar in front of the ports, If you have any questions you are always welcome especially in band-pass boxes. to contact us on DLS in Sweden. We will do our Good luck with your box project! best to assist you.
- Page 22 30 liters 34 liters SUBWOOFERS Port 3" x 22 cm 3" x 20 cm For the present subwoofer program we advice you to study our website www.dls.se for enclosure DLS W512C: examples. Music: Normal Vented box 45 liters 51 liters Port 4"...
- Page 23 SOME USEFUL TABLES TABLE 1: Shows the relation between power increase and SPL in dB SPL measured 1 mtr in front of the speaker at three different speaker sensitivities. Input power (W) Speaker sens- 91 dB 95 dB 100 dB 105 dB 110 dB 115 dB 120 db 125 dB...