Quickie and Quicksand spl question

[aragorn723]

Hi,

How many db could a Quickie/Quicksand combo create with 8 ohm, 92db sensitivity speakers (without distortion).  Thanks,

Dave

[Bonzo]

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)

[Bonzo]

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

[Doc B.]

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.

[Bonzo]

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!).

[aragorn723]

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

[Paul Birkeland]

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???

[aragorn723]

yes, Definitive Technology BP6Bs