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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: ok, but... posted by hZ on May 6, 1999 at 01:16:10:
The first problem is the drivers are not the same -- if you're lucky
they will be within + or - 15% of the specs. Because the drivers are
not exactly the same each driver can cause the other driver(s) to move
slightly (distortion) due to induced voltage (aka back EMF). This problem increases as you connect more drivers in series and increases
with drivers that have large sample-to-sample variations.The induced voltage problem would not apply to a series connection
of both voice coils in a dual voice coil driver.Since you have only 40 watt s per channel, I would recommend one high efficiency four ohm driver per channel or two high efficiency eight
ohm drivers connected in parallel per channel. That's the way to get
maximum SPL from an amplifier. Your receiver will run warmer with a four ohm load but it's highly unlikely to have any other problem.
To be safe, measure the DC resistance of a speaker before
connecting it. If the resistance is 2.5 ohms or higher the probability
of any receiver or amplifier shutting down or overheating from a low impedance load is very small.The potential 6 dB SPL gain from adding a second driver connected in
parallel to the first depends on the amplifier. Very few amplifiers
can provide double the output at 4 ohms versus 8 -- so the total SPL increase from adding a second driver is more likely to be 4 dB or
5 dB. Most people find it hard to believe adding a second driver
connected in parallel can add up to 6dB SPL, but it's true.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Why to avoid drivers connected in series ... - Richard Greene 13:20:12 05/06/99 (3)
- I almost got it... - hZ 19:50:40 05/06/99 (2)
- Re: I almost got it... - Lukasz F 01:29:07 05/07/99 (1)
- thanks .nt. - hZ 23:20:53 05/07/99 (0)
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