Hello everyone,
I am a very beginner in the world of audio, but this forum is a fantastic source of knowledge, so I first need to all diyAudio users for sharing that much info with the rest of the world.
So for my question, it is actually pretty simple.
I am looking for a solution to power the little (no Hifi) equipment I have at home that was given to me.
My goal is to use a pair of 6 ohms 40W speakers and a 1.5 ohm 20cm subwoofer to just get a better sound when watching TV, and listen to music via bluetooth from time to time.
My question is around the subwoofer.
Most 2.1 amp I found on Taobao (as I live in Taiwan) mention an allowed impedance of 4 to 8 ohms. (I have my eyes on this amp, but I am open to other recommendations)
What does that mean in my case ?
What happens if I plug my 1.5 ohm ?
It is probably a stupid question, but I can't find any clear explanation online.
Thank you every one
I am a very beginner in the world of audio, but this forum is a fantastic source of knowledge, so I first need to all diyAudio users for sharing that much info with the rest of the world.
So for my question, it is actually pretty simple.
I am looking for a solution to power the little (no Hifi) equipment I have at home that was given to me.
My goal is to use a pair of 6 ohms 40W speakers and a 1.5 ohm 20cm subwoofer to just get a better sound when watching TV, and listen to music via bluetooth from time to time.
My question is around the subwoofer.
Most 2.1 amp I found on Taobao (as I live in Taiwan) mention an allowed impedance of 4 to 8 ohms. (I have my eyes on this amp, but I am open to other recommendations)
What does that mean in my case ?
What happens if I plug my 1.5 ohm ?
It is probably a stupid question, but I can't find any clear explanation online.
Thank you every one
The low impedance load demands more current from the amplifier, and also causes it to run hot. So it will work for awhile, and at low volume. I predict that when you try to get more out of it the amp will shut down or destroy itself (if not designed with protection).
There is a parallel TPA3255 mode. This amp can do loads down to 2 Ohms nicely. You could also put some resistance in series to increase the driver impedance, e.g. 0.5 Ohms. This will also increase Qts.
I would look for a cheap car audio amp and a 12-14V SMPS instead of the TPA3255.
There is a parallel TPA3255 mode. This amp can do loads down to 2 Ohms nicely. You could also put some resistance in series to increase the driver impedance, e.g. 0.5 Ohms. This will also increase Qts.
I would look for a cheap car audio amp and a 12-14V SMPS instead of the TPA3255.
Thank you CharlieLaub.
For the resistance, do you know the wattage I need ?
I read that some people put light bulb in series with the speaker as the resistance increases with the voltage and also act as a fuse in case the power is too high. What do you think ?
As for the car amp, could you share a link so I understand what you have in mind ? A mono sub amp, right ?
Any good quality car amp (mono is fine) can drive 2 Ohm loads all day long. Just look at the specs and see what you can get. Then no resistor is needed, and no power will be wasted (in the resistor), it will all go to the driver.
You can guesstimate the required resistor wattage in this way: given that the two are in series, the resistor will dissipate about Rresistor / (Rresistor + Rdriver) of the total input power, the rest is dissipated by the driver. Rdriver can be taken as Re, or the nominal resistance. This is close enough for your purposes.
You can guesstimate the required resistor wattage in this way: given that the two are in series, the resistor will dissipate about Rresistor / (Rresistor + Rdriver) of the total input power, the rest is dissipated by the driver. Rdriver can be taken as Re, or the nominal resistance. This is close enough for your purposes.
Thanks
I kept looking and came across the Wondom JAB3 boards.
They have the 2x50W and a 1x100W with a minimum impedance of 1.6W (nominal 2W) that can be daisy chained to make a 2.1 system
They are equipped with a DSP and a programmable interface, that can be fun if I want to play in the future.
What do you think ?
I kept looking and came across the Wondom JAB3 boards.
They have the 2x50W and a 1x100W with a minimum impedance of 1.6W (nominal 2W) that can be daisy chained to make a 2.1 system
They are equipped with a DSP and a programmable interface, that can be fun if I want to play in the future.
What do you think ?