Bottlehead Forum
Bottlehead Kits => Legacy Kit Products => Quicksand => Topic started by: aragorn723 on May 02, 2015, 02:22:39 PM
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Hi,
How many db could a Quickie/Quicksand combo create with 8 ohm, 92db sensitivity speakers (without distortion). Thanks,
Dave
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The specs said 4W, 8ohm, 5% distortion, so maybe 2 or 3 W of "clean" power, so let's say a conservative 95 db? (3 db each power doubling after the first watt)
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And that the value is at 1m.
So subtract 6db each doubling of the distance from the speaker (back to 89db at 2m, 83 at 4m ecc).
And add 1 db because we're speaking about a stereo set (there is a small increase of spl for 2 speakers, but if I remember correctly only when adding another speaker, for 3 speakers spl is the same as 2).
Ciao
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4w at 5% is a good figure because of the pleasant, even order rich harmonic spectrum of the single ended circuit. Thus more like 96/97 would probably sound fine. Also you are not accounting for the reverberant field when you say sound falls off 6dB with doubling of distance. Anechoic, yes, but not in a real room. Try measuring this with an SPL meter in a typical room and you will see that there is quite a bit of energy present at a distance.
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Also you are not accounting for the reverberant field when you say sound falls off 6dB with doubling of distance. Anechoic, yes, but not in a real room. Try measuring this with an SPL meter in a typical room and you will see that there is quite a bit of energy present at a distance.
You're right, they are a rough approximation: in real world, and in real room, reverbaration plays a big role in restoring the loss (and adding some colorations too!).
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Just curious.. I have been thinking about possibly downsizing from a monster solid state amp to something that takes up less room (trying to downsize stuff in the condo to make more room till we can move). This morning I was listening to some music at a normal volume, and measured it with a smartphone app, and that was around 50db on average. If there's a really good song, I like to turn it up, and that is around 60db (at ~8 feet away). The neat thing about the Quicksand would be that changing the amp would take the whole system off the grid too (The Quickie is fed by a battery powered laptop, which also powers the dac). It sounds like the Quicksand would make enough power for me, but I wonder about the whole impedance thing too (remembering a thread from quite a while ago). Would this be workable for my situation?
Dave
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but I wonder about the whole impedance thing too (remembering a thread from quite a while ago). Would this be workable for my situation?
You have 8 Ohm speakers, right???
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yes, Definitive Technology BP6Bs