Hello all,
I made a 2.1 in last weekend. I used 4xTDA2052 (standard application circuit on ST's manual+passive crossover circuits) with 2x22v (250VA) PSU and 2 x 4ohm subwoofer + 2 x 4 ohm satellite speaker box then plugged it in to my pc's line out. And no hum, no noise and no on/off plops... Until that its all normal, but I feel it doesn't give 40W output level! Because generally my volume pot is on maximum level!
Question;
-Am I mad or deaf?
-4 TDA2052s dont give 40W x 4?
-160W doesnt enough for a 15m2 room?
* They (SGS Thomson) say TDA2052 gives 48W to 4ohm with +/-23v PSU...
I made a 2.1 in last weekend. I used 4xTDA2052 (standard application circuit on ST's manual+passive crossover circuits) with 2x22v (250VA) PSU and 2 x 4ohm subwoofer + 2 x 4 ohm satellite speaker box then plugged it in to my pc's line out. And no hum, no noise and no on/off plops... Until that its all normal, but I feel it doesn't give 40W output level! Because generally my volume pot is on maximum level!
Question;
-Am I mad or deaf?
-4 TDA2052s dont give 40W x 4?
-160W doesnt enough for a 15m2 room?
* They (SGS Thomson) say TDA2052 gives 48W to 4ohm with +/-23v PSU...
> 10 W with normal speakers will get your neighbours 😡
..... but 4000 watts want some people in their cars..... 3-4 sqr meters....
..... but 4000 watts want some people in their cars..... 3-4 sqr meters....
I gues I am a "normal" human. And no neighbor knocked my door until now! I think my amplifiers are some poor! Whats the problem do you think?
You have deaf neighbours, haha.
No but 40 watts means nothing. You have to know what the total output is, in terms of speaker sensitivity. 40 watts into cheap 85 dB speakers will not sound loud enough. 5 watts into a 94 dB+ speaker will be deafeningly loud.
I have built a project with 35 watt bridged TDA 2030, into 90dB Jamo E470, and could not listen more than halfway loud (Linear volume pot, not lawfaked) at any time.
No but 40 watts means nothing. You have to know what the total output is, in terms of speaker sensitivity. 40 watts into cheap 85 dB speakers will not sound loud enough. 5 watts into a 94 dB+ speaker will be deafeningly loud.
I have built a project with 35 watt bridged TDA 2030, into 90dB Jamo E470, and could not listen more than halfway loud (Linear volume pot, not lawfaked) at any time.
With your fingers in your ears first, get someone else to turn the volume right up. Is there any distortion? If it still sounds clean then your system does not have enough voltage gain.
50+50 watts into ~87dB/W speakers in my 3x7 metre loungeroom is way, way loud enough to drive my ears well into their non-linear region.
50+50 watts into ~87dB/W speakers in my 3x7 metre loungeroom is way, way loud enough to drive my ears well into their non-linear region.
dB or not dB.
The second speaker would have a SPL of 99.2910293% of the first.
Not where I come from it wouldn't. 😉sangram said:
The second speaker would have a SPL of 99.2910293% of the first.
Re: dB or not dB.
HAHA .. oo, ouch 🙂
But yeah, both cases would produce slightly over 100dB (of course, at 1 metre length!)
Circlotron said:
HAHA .. oo, ouch 🙂
But yeah, both cases would produce slightly over 100dB (of course, at 1 metre length!)
Yeah ...
In my 5x4 room i have about 2800 W RMS at aprox 98 dB
I attached a picture of my system .
The aspect of the speaker's is not so good .. i didn't want some fancy looging speaker's ... i just want a good sound ...
Notice the klevar speaker's ( yellow ) and the bass horn's ( standing on the subwoofer's , next to the speaker's with yellow driver )
In my 5x4 room i have about 2800 W RMS at aprox 98 dB
I attached a picture of my system .
The aspect of the speaker's is not so good .. i didn't want some fancy looging speaker's ... i just want a good sound ...
Notice the klevar speaker's ( yellow ) and the bass horn's ( standing on the subwoofer's , next to the speaker's with yellow driver )
Attachments
Re: dB or not dB.
Maybe I put an extra zero into the calculator
That was a figure of speech, so OK, 10 watts into 94 dB would be a lot louder than 40 watts into 85 dB speakers...
Circlotron said:
Maybe I put an extra zero into the calculator That was a figure of speech, so OK, 10 watts into 94 dB would be a lot louder than 40 watts into 85 dB speakers...
I never need to plug my fingers to my ear! And I do not hear any distortion at full volume with my 2.1! My subwoofers are 2 x 16cm 4ohm WESTRA (I dont know they are good or bad brand but I am sure that they are enoughly soft!). But with my old amplifiers (2xLM1876 4 x 22W distorted) my system was (with same speakers) louder than now!
Can you comment now?
Can you comment now?
If you think is not loud ... do what i do .. build one mountain of speaker's and rock the bloc 🙂 simple .. no surround .. just a good stereo sound ...
I can't stay in my room with the volume set at 3% ... once i set it to 45 % and blood from my nose come out ...
I think you have what you need for that room ...
I can't stay in my room with the volume set at 3% ... once i set it to 45 % and blood from my nose come out ...
I think you have what you need for that room ...
I guess its a danger of earthquake! As you know (if you) Turkey is on big fault lines.... 2800W RMS is a (i cannot find a word to say). Anyway I have no job with bloody noses etc... I just wanna have a GOOD sound system. Just that! Any help?
The fact that you cannot drive your amplifier into distortion even a little bit makes me still think the power amp IC's are not getting enough signal fed to them.Dxvideo said:
Hi Dx,
is that 22k & 560r as the gain setting on the chipamps?
Gain= 40.3 times.
Maximum output voltage ~ 15Vac into 4ohms.
maximum input to the chipamps ~ 15/40.3 ~=372mVac
Measure the average output from your music source.
It needs to be attenuated to <=37mVac to drive the amps to -20dB rel. to maximum output.
What's the sensitivity of the speakers?
What volume is expected from 0.5W input to the speakers?
Passive filters in front of the amps? Is this intended to be close to L-R crossover?
That summing Low Pass is wrong.
Where does pin7 get it's input offset current from?
is that 22k & 560r as the gain setting on the chipamps?
Gain= 40.3 times.
Maximum output voltage ~ 15Vac into 4ohms.
maximum input to the chipamps ~ 15/40.3 ~=372mVac
Measure the average output from your music source.
It needs to be attenuated to <=37mVac to drive the amps to -20dB rel. to maximum output.
What's the sensitivity of the speakers?
What volume is expected from 0.5W input to the speakers?
Passive filters in front of the amps? Is this intended to be close to L-R crossover?
That summing Low Pass is wrong.
Where does pin7 get it's input offset current from?
Dear Andrew,
This is a very old project (about 5 years..!) and I cannot even remember what happened to it...
But thanks for the reply.
This is a very old project (about 5 years..!) and I cannot even remember what happened to it...
But thanks for the reply.
Re: Yeah ...
and in my 5m X 4m room I have 800watts to the 104dB sub
and am aiming to have about 8000watts in my car to 9000cm^ of cone area 🙂
darkm4n said:
and in my 5m X 4m room I have 800watts to the 104dB sub
and am aiming to have about 8000watts in my car to 9000cm^ of cone area 🙂
Interface with PC.
You are pluggin into "PC line out".
and if u are not getting desired output, connect a 2-5x gain opamp based amplifier between ut power amplifier and PC line out.
I also faced similar problem with my gainclones conencted to PC, so i used my spare Cmoy headphone Amplifier in between them with 5x gain and sound improved dramatically.
You are pluggin into "PC line out".
and if u are not getting desired output, connect a 2-5x gain opamp based amplifier between ut power amplifier and PC line out.
I also faced similar problem with my gainclones conencted to PC, so i used my spare Cmoy headphone Amplifier in between them with 5x gain and sound improved dramatically.
those passive filters r responsible for the signal loss..u need to boost the levels as "Kuldeep said...
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