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Old 11th September 2006, 08:53 AM   #11
Colin is offline Colin  United Kingdom
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Halving the impedance (8 ohms to 4 ohms) means your amp puts out approx twice as much power (depending on amp). That's your first 3dB increase in output from the speakers.

Using two drivers gives you your other 3dB increase. BUT it doesn't go all the way into the treble. Expect the bass and mid-bass to be 3dB louder but the treble will stay the same. (At a certain distance apart, the two drivers will act as one driver with twice the surface area - equals more dB - above that distance, they act as two again and no increase in volume.)
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Old 11th September 2006, 09:00 AM   #12
TDLofCC is offline TDLofCC  Netherlands
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Alright, that sounds good enough for me to at least try it.

Any idea how far apart they the two drivers should be ?
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Old 11th September 2006, 10:08 AM   #13
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Quote:
Originally posted by Jim Griffin
Let me add to one of the statements that Sreten made. The statement was:

"Effort ? 6dB more maximum output, 6dB more bass when used as a bipole or 1.5way compared to the mid/treble level, 4 ohm load."

Essentially, you get the same thing for the 1.5 way configuration you have the same output above the BSC point as the bipole assuming that you account for the baffle step with the 0.5 way driver.
Hi,

I would add that the apparent amount of BSC farfield for a bipole
is less than 1.5 way because there will be more midrange / treble
in the farfield diffuse soundfield, so in this case a bipole is the
most suitable (for relatively near wall). The jury is out on the
relative merits / effects of bipoles, whist axial anechoic output
is identical to a 1.5 way, perceived response is a different story.

/sreten.
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Old 11th September 2006, 11:12 AM   #14
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally posted by TDLofCC
Wow ... that kinda of went OVER my head there ...

English is nog my first language ... so thats making it even harder

So, if Henkjan would care to translate it to dutch ... I might be able to understand it ...

extreme samenvatting: hij legt uit dat je bij dipole en bij de 1 weg configuaratie er alleen in t laag 6dB bij krijgt als je 2 drivers toepast.
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Old 11th September 2006, 11:35 AM   #15
TDLofCC is offline TDLofCC  Netherlands
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Cheers

Dat is op zich alleen maar goed, want daar missen deze drivers toch wel wat. Vandaar dat mijn sub in aanbouw is

Bedankt.

And now back to English
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