I was planning on buying a midrange speaker along with a tweeter. I was told that if I hook a 2uF capactior from positive of the tweeter to the positive of the speaker, the tweeter will be rolled off at 10 khz, at 6db/octave.
Does this mean that the tweeter/speaker combination would be wired in parallel? Both are 4ohms and my amplifier has 2 channels that needs no less than 4ohm per channel. By wiring the tweeter and speaker with the 2uF capacitor, would they end up being 2ohms? If so, is there a way to avoid this?
Thank you for any information
Does this mean that the tweeter/speaker combination would be wired in parallel? Both are 4ohms and my amplifier has 2 channels that needs no less than 4ohm per channel. By wiring the tweeter and speaker with the 2uF capacitor, would they end up being 2ohms? If so, is there a way to avoid this?
Thank you for any information
Yes it is a parallel XO.
2 uF into 4 ohms gives a 6dB/octave XO at 20 kHz (you need to use 4 uF for a 4 ohm T)
The impedance of the cap at low frequencies, and that of the voice coil in the midbass mean that you end up with a nominal 4 ohm speaker (ie 4 ohms in parallel with lots & lots of ohms is still 4 ohms.
dave
2 uF into 4 ohms gives a 6dB/octave XO at 20 kHz (you need to use 4 uF for a 4 ohm T)
The impedance of the cap at low frequencies, and that of the voice coil in the midbass mean that you end up with a nominal 4 ohm speaker (ie 4 ohms in parallel with lots & lots of ohms is still 4 ohms.
dave
It would be half the ohms if the two speakers were carrying the same frequencies, but since the capacitor eliminates the lower frequencies, there is no real parallel as only one of the drivers is carrying the low end. Basically you are paralleling a 4 ohm with a gazillion ohms which effectively results as 4 ohms.
You have to ask the question to the amplifier
'Xcuse me , Mr Amp , what happens when there is a mixed load at your output '?
A : ' Well, errrrr , I don't know ,sometimes I stumble but I always try to keep
the right track ; you should ask those stupid engineers that make a mess
inside those boxes '
Q: 'So you would be happier in driving a loudspeaker directly ? '
A :' I preferred to seat on the table in my lab , when I was only asked to deliver my power to a set of resistors ; outside , it's hell !!'
'Xcuse me , Mr Amp , what happens when there is a mixed load at your output '?
A : ' Well, errrrr , I don't know ,sometimes I stumble but I always try to keep
the right track ; you should ask those stupid engineers that make a mess
inside those boxes '
Q: 'So you would be happier in driving a loudspeaker directly ? '
A :' I preferred to seat on the table in my lab , when I was only asked to deliver my power to a set of resistors ; outside , it's hell !!'
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