Horn Loudspeaker in Car

1st January 2004 - report written and upload

True event around April 2003

In Car Study

The system: -

• Alpine Head Unit model CDA-7939E
• Linear Power Pre-amp model PAII
• Precision Power Stereo 1/3 octave 30 band Equalizer model DEQ-230
• two units of Bostwick Active Crossover model EC2i 
• two units of Linear Power Amplifier model 452i
• Signat Power Amplifier model RAM-4
• Image Dynamic Horn
• Bostwick 654 Mid Bass 6.5"
• Bostwick 1568 Woofer 15" double magnet

• The woofer will be band-passed from 27Hz to 100Hz
• The mid-bass will be band-passed from 100Hz to 480Hz
• The horn will be high-passed at 480Hz

Signat Power Amplifier model RAM-4 is a 150 watts RMS per channel stereo amplifier. It has two 30 amps fuses which is capable of consuming a minimum of 12v times 60 amps = 720 watts peak. At RMS which is 720 times 0.707 = 509.04 watts RMS. Further coupled to the assumption that power amplifiers are 50% efficient therefore 509.04 divide by 2 = 254.52 watts RMS bridged. Well approximate. Just enough to power a single 15". More power is needed to safeguard headroom for high dynamic musics.

Linear Power Amplifier model 452i is a 22.5 watts RMS per channel stereo amplifier. It has two 5 amps fuses, which when using the above assumption gives 42.42 watts RMS per channel. Just enough for the mid-bass. Again more power is needed.

hhehehehehe, Linear Power...............under spec???.................value for money...........

Finally another Linear Power Amplifier model 452i to power the horns. This will be more than enough.

Signal Path: -

1. Horn Loudspeaker in Car
2. Smoothed
3. Left Only
4. EQ Attempt 1
5. EQ Attempt 2
6. Fullrange Study
7. Horn Flip Phase

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