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Replacing stock speakers - Ram 1500
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<blockquote data-quote="Doxquzme" data-source="post: 8877256" data-attributes="member: 689267"><p>All things being equal in comparing speakers on the same amplification, the difference in overall volume will be slightly less with a same efficiency driver giving the amp a 4 ohm (1 ohm more load) than a 3 ohm load. It's a combination of factors but generally speaking, 1 oum higher impedance will net you roughly 10-15% less volume. This is because amplifier output a factor of both it's output capability and the impedance it sees from the speaker. 4 ohms is 1 ohm more impedance than 3 - more resistance less power output, about 15%. Since the OEM amp is designed to give its's highest output at 3 ohms than 4, it would be slightly less, If that amp was 2 ohm stable (likely not) then 2 ohms speakers would theoretically put out 33% more, everything (speakers) all being the same as the same speaker at a 4 ohm load.</p><p></p><p>Most of these are actual differences in a controlled sound lab, not in a car environment and can be offset by differences in the speakers efficiency too. Here is the measured difference in SPL, in a sound room anechoic chamber at 1 watt/1 meter. Assuming that the speaker is the same unit, can handle the power and the amp is stable down to 1 ohm- strictly for comparatives and not as simple in a car environment. It takes roughly a 9 db increase in oupt to double the volume perceived by the ear (and actually more in a car).</p><p></p><p>20 to 40 watts + 3db (33% louder)</p><p>40 to 80 watts, another + 3db (66% louder that base)</p><p>80 to 160 watts, another + 3db(99% louder than base) or a percieved doubling of the SPL to the ear.</p><p></p><p>Output (SPL) is affected by the efficiency of the driver, inversely in the same way. Given the exact same model speaker size/design an 84db given 20 watts will be 33% lower than the same driver that is 87db efficient and 66% lower than the same driver at 20 watts that has an efficiency rating of 90db etc.</p><p></p><p>It's a long explanation as to why, ultimately, 4 ohms drivers will be very close in output as their 3 ohm counterparts. It assumes that most all the factors other than the impedance are the same.</p><p></p><p>If you go with a 3ohm speaker that is 87db efficient (1 watt/1 meter) it will be roughly as loud as a 4 ohm speaker that has a rated efficiency of 88.5 db, slighter quieter than the same 4 ohm driver that has a rating of 90db.</p><p></p><p>Find the most efficient driver that fits your needs in a 3 ohm or 4 ohm impedance, relative to each other (not the factory speakers as the efficiency is not known and could be higher or lower) and go with it. Use the efficiency ratings as a barometer in the new speakers you're looking at, comparatively.</p></blockquote><p></p>
[QUOTE="Doxquzme, post: 8877256, member: 689267"] All things being equal in comparing speakers on the same amplification, the difference in overall volume will be slightly less with a same efficiency driver giving the amp a 4 ohm (1 ohm more load) than a 3 ohm load. It's a combination of factors but generally speaking, 1 oum higher impedance will net you roughly 10-15% less volume. This is because amplifier output a factor of both it's output capability and the impedance it sees from the speaker. 4 ohms is 1 ohm more impedance than 3 - more resistance less power output, about 15%. Since the OEM amp is designed to give its's highest output at 3 ohms than 4, it would be slightly less, If that amp was 2 ohm stable (likely not) then 2 ohms speakers would theoretically put out 33% more, everything (speakers) all being the same as the same speaker at a 4 ohm load. Most of these are actual differences in a controlled sound lab, not in a car environment and can be offset by differences in the speakers efficiency too. Here is the measured difference in SPL, in a sound room anechoic chamber at 1 watt/1 meter. Assuming that the speaker is the same unit, can handle the power and the amp is stable down to 1 ohm- strictly for comparatives and not as simple in a car environment. It takes roughly a 9 db increase in oupt to double the volume perceived by the ear (and actually more in a car). 20 to 40 watts + 3db (33% louder) 40 to 80 watts, another + 3db (66% louder that base) 80 to 160 watts, another + 3db(99% louder than base) or a percieved doubling of the SPL to the ear. Output (SPL) is affected by the efficiency of the driver, inversely in the same way. Given the exact same model speaker size/design an 84db given 20 watts will be 33% lower than the same driver that is 87db efficient and 66% lower than the same driver at 20 watts that has an efficiency rating of 90db etc. It's a long explanation as to why, ultimately, 4 ohms drivers will be very close in output as their 3 ohm counterparts. It assumes that most all the factors other than the impedance are the same. If you go with a 3ohm speaker that is 87db efficient (1 watt/1 meter) it will be roughly as loud as a 4 ohm speaker that has a rated efficiency of 88.5 db, slighter quieter than the same 4 ohm driver that has a rating of 90db. Find the most efficient driver that fits your needs in a 3 ohm or 4 ohm impedance, relative to each other (not the factory speakers as the efficiency is not known and could be higher or lower) and go with it. Use the efficiency ratings as a barometer in the new speakers you're looking at, comparatively. [/QUOTE]
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