Hi all
Sorry for my ignorance, but a friend of mine gave me his old speakers wich are Magnat Sonobull 120, and i saw in technical data that they have a sensibility of 1,2 watts, now, can i convert this in Db/watt ?
I conected them to my 2 W tube amp and i am very pleased with the sound !
Thanks
Sorry for my ignorance, but a friend of mine gave me his old speakers wich are Magnat Sonobull 120, and i saw in technical data that they have a sensibility of 1,2 watts, now, can i convert this in Db/watt ?
I conected them to my 2 W tube amp and i am very pleased with the sound !
Thanks
Usually the sensitivity is measured as dB of SPL output at 2.83VAC input at 1 meter, on the main speaker axis in an anechoic chamber (or outdoors).
Often the frequency is 400Hz. Probably the implied output for 1.2W is 90dB, so it would be 90dB/1.2W.
sensitivity, and 1.2 watts
Almost always a "sensitivity" is relative to the amount of power to produce a sound level of 100 dB, at 1 meter from the center of the front-face of the speaker enclosure. I vaguely remember that the speaker cabinet also has to be ½ meter lifted above the ground (the base), too.
100 dB at 1 m, with 1.2 W input is quite good.
If you like the sound from your 2 W amplifier, even better.
It probably gets pleasingly loud during the more potent music transitions.
And of course, your 2 W amplifier can very, very likely produce well above 2 watts of peak power, as the waveform makes its chaotic migration from + to - and back. So… good to go!
With ground-effect, the dispersion at 4 meters (a more-or-less ordinary listening distance, in a decent sized living room) nominally drops the level to 9 to 10 decibels, from the 1 meter spec. The "corner effect" (of putting your speakers right in the corner of a room) while not well regarded, again diminishes the propagation losses. Great for P.A. situations, not good for symphonic music listening.
GoatGuy
el₁₅₆;4117849 said:
Almost always a "sensitivity" is relative to the amount of power to produce a sound level of 100 dB, at 1 meter from the center of the front-face of the speaker enclosure. I vaguely remember that the speaker cabinet also has to be ½ meter lifted above the ground (the base), too.
100 dB at 1 m, with 1.2 W input is quite good.
If you like the sound from your 2 W amplifier, even better.
It probably gets pleasingly loud during the more potent music transitions.
And of course, your 2 W amplifier can very, very likely produce well above 2 watts of peak power, as the waveform makes its chaotic migration from + to - and back. So… good to go!
With ground-effect, the dispersion at 4 meters (a more-or-less ordinary listening distance, in a decent sized living room) nominally drops the level to 9 to 10 decibels, from the 1 meter spec. The "corner effect" (of putting your speakers right in the corner of a room) while not well regarded, again diminishes the propagation losses. Great for P.A. situations, not good for symphonic music listening.
GoatGuy
volts, watts, ohms, R and Z
And the reminder that
P = E²/R (or Z = AC impedance, approximately)
P = 2.83²/8 ohms
P = 1.00 watt, nominally.
So again, SPL for 1 watt of speaker input power; at 1 meter; anechoic chamber, or simpler system such as outdoors (good call!)
And the reminder that
P = E²/R (or Z = AC impedance, approximately)
P = 2.83²/8 ohms
P = 1.00 watt, nominally.
So again, SPL for 1 watt of speaker input power; at 1 meter; anechoic chamber, or simpler system such as outdoors (good call!)
Last edited:
Yes, lots of speaker companies have used the great outdoors for their anechoic chamber. For low frequencies, you bury the speaker flush with the surface,
and then have a good 2Pi chamber, with no low frequency cutoff.
- Status
- Not open for further replies.