Hello,
I have a question that what will happen if the solid state amplifiers designed to drive 4-8 Ohms speakers face with 2 Ohms load at some frequencies?
I'm building crossover networks, second-order low-pass filters, for my 4 Ohms subwoofers. Basically, I tried to simulate the results on simulator with the component values I already have; 3.3mH and 390uF pairs. The result is crossover point of 150Hz with Chevbychev alignment (+3dB at 150Hz).
However, the impedance curve fell down to 2 Ohms at 150 Hz, as depicted on attached. So, will any dangers happen to the amplifier?
I have a question that what will happen if the solid state amplifiers designed to drive 4-8 Ohms speakers face with 2 Ohms load at some frequencies?
I'm building crossover networks, second-order low-pass filters, for my 4 Ohms subwoofers. Basically, I tried to simulate the results on simulator with the component values I already have; 3.3mH and 390uF pairs. The result is crossover point of 150Hz with Chevbychev alignment (+3dB at 150Hz).
However, the impedance curve fell down to 2 Ohms at 150 Hz, as depicted on attached. So, will any dangers happen to the amplifier?
Attachments
What amplifiers are you using?
This seems to be the easiest way to answer your question.
Some hold up under that load, but not many consumer amps made for the living room would like it.
Did you wire these 2 woofers in parallel to become this heavy load?
You can also use a bit higher induction like 4 or 5 mH, and a bit lower capacitance and redo the simulation with those values.
Does that help?
This seems to be the easiest way to answer your question.
Some hold up under that load, but not many consumer amps made for the living room would like it.
Did you wire these 2 woofers in parallel to become this heavy load?
You can also use a bit higher induction like 4 or 5 mH, and a bit lower capacitance and redo the simulation with those values.
Does that help?
Many '4 ohm' amplifiers tolerate/forgive 2 ohms at high frequencies due to 'spectral energy'
but at low frequencies you do need to be careful.
3.3mH is way too low a value. Go 5 or 6, plus 200uF.
Don't go for cross-over gain.
but at low frequencies you do need to be careful.
3.3mH is way too low a value. Go 5 or 6, plus 200uF.
Don't go for cross-over gain.
I use Braun Atelier A1 integrated amplifier.
No, there is only single subwoofer per side and also with lowpass filter for each sub.
The load curve on attached picture was the simulation result of a 4-Ohm subwoofer with a lowpass filter (2nd order; 33mH and 390uF).
low frequency not a good idea.
Not sure if I found the right A1 but it is listed at 8 ohms 50 watts
not even sure if it can do 4 ohms. 2 ohms no way
do you have a datasheet or TS specs for the subs.
What speaker is this? we can get a actual impedance curve
see what is really happening.
Not sure if I found the right A1 but it is listed at 8 ohms 50 watts
not even sure if it can do 4 ohms. 2 ohms no way
do you have a datasheet or TS specs for the subs.
What speaker is this? we can get a actual impedance curve
see what is really happening.
They’re KEF KAR200B (SP1330). I only have some parameters as well.
Diameter = 8”
Impedance = 4 Ohms
Vas = 50 liters
Qts = 0.4
Fs = 35 Hz
Spl = 90 dB/1W
RMS power = 150 W
Well cool, that is not enough data to do anything.
Well ...guess its a 4 ohm sub
basically gonna be close to Re anyways at 250 Hz
so 3.8 to 4 ohms.
About all your gonna get with a 3.3 mH coil
because making the cap larger will change the impedance curve.
to dip way to low
close to a short.
Anyways 3.3 mH needs 82 to 100u
that is it, any larger cap value is dangerous.
to go lower you need 6.8 mH
same thing only 82 to 100u
or the impedance gets dangerous.
Well ...guess its a 4 ohm sub
basically gonna be close to Re anyways at 250 Hz
so 3.8 to 4 ohms.
About all your gonna get with a 3.3 mH coil
because making the cap larger will change the impedance curve.
to dip way to low
close to a short.
Anyways 3.3 mH needs 82 to 100u
that is it, any larger cap value is dangerous.
to go lower you need 6.8 mH
same thing only 82 to 100u
or the impedance gets dangerous.
https://www.hifiengine.com/manual_library/braun/a1.shtml
50 Watts at 8 ohm, 65 Watts at 4 ohm, bandwith 20-20.000Hz, 2sc2773/2sa1169 output transistors. Not too shabby electronically if you ask me.
Will be fine with better filter like discussed previously by many.
Good luck
50 Watts at 8 ohm, 65 Watts at 4 ohm, bandwith 20-20.000Hz, 2sc2773/2sa1169 output transistors. Not too shabby electronically if you ask me.
Will be fine with better filter like discussed previously by many.
Good luck