[85dB]

Hi Audioguru,
This is an example of a 16,5cm car speaker (the same shop which i've bought my speakers from). As you said "A speaker might be able to handle 100W for only a few milli-seconds, ... " so in this case, this speaker might be able to handle 200W for a few milli sec.  ?
General specifications
Top power, IEC 268-5 (W)  220 
Max. power in, IEC 268-5 (W)  200 
Power out, IEC 268-5 (W)  45 
Frequency(Hz)  50 - 20 000 
Sensitivity (dB/W/m)  90

Thanks for being patient to answer my boring questions  ;D

[85dB]

It is a little 4 inch speaker that has a max continuous power rating of about 10W to 20W RMS.
If it gave 85dB at 1m with 1 Watt input then it is not sensitive.

Watts ratios can be calculated in dB:
3dB is half or double the power.
5dB is 0.316 or 3.16 times the power.
10dB is 1/10th or 10 times the power.
So 100W is 20dB louder than 1W. If the speaker could survive that much power then the loudness will be 105dB. I bet its voice coil will glow red hot at 100W just before it melts.

[85dB]

Hi SM2GXN & Audioguru,
I actually measured it by "Sound level meter"

[85dB]

Hi friends,
Can someone help me with some calculations please. A speaker has 85dB, how much is its effect in watt?

Thanks

[RMS]

Thanks man  ;D

[CD Drive]

Hi,
A CD Drive needs +5V, GND & +12V to work. The pin which is marked +12V, how much tolerates it (max voltage)? I've tried with +14.4V, it works normally...

Thanks

[RMS]

Hi,
A speaker marked with 80W RMS. What does RMS (Root Mean Square) means here?

Thanks

[Bridge Amplifier]

Hi,
I thought it would not work at 14,4V, but i tried in the car and it really worked  ;D. It gives 8W to 10W. It's not much for a bass box but it does well  ;D.

Best wishes

[Bridge Amplifier]

Hi Mr. Audioguru,
I've built the amp and it sounds pretty good  ;D. First i would use it in the car but the voltage was not enough, it needs at least 15V  :(. So i should use it for another application, maybe DVD player or something else ...

Best Regards

[Bridge Amplifier]

Hi SM2GXN,
That was exactly what i wanted. Thank you so much  ;D

Best regards

[Bridge Amplifier]

Hi everybody,
Please can you help me guys if this amplifier can be bridged?
This is its datasheet: http://www.datasheetcatalog.com/datasheets_pdf/T/D/A/1/TDA1521Q.shtml

[Bass Box]

Hi audioguru and everybody,
Should i connenct pin 8 and pin 6 to Vp as i drew? and what is pin 12? ??? where should it be connencted?

Thanks

[Bass Box]

Hi audioguru,
Do you mean i will connect like this: ;D  (isn't it short?  ???)

[Bass Box]

Hi Audioguru

[Bass Box]

okay. I have another question, can i use two power amplifiers and only one preamp. as you know Audioguru i've built a complete audio amp (preamp and power amp). these circuits i used below:
Preamp: http://www.electronics-lab.com/projects/audio/039/index.html
Power amp: http://www.electronics-lab.com/projects/audio/006/index.html
and i want to add this amp, (can i take signals from the output of the preamp, i mean one preamp to two power amps)?  ???
this is the another amp:
http://www.ortodoxism.ro/datasheets/nationalsemiconductor/DS005129.PDF

thanks

[Bass Box]

Hi Audiogu,
The bass box has one speaker of 6 ohms (60W i think) its not so powerful but its enough for me  ;D. I think 60W-100W amp will do well. There is a low-pass filter into the box so i think i need only a power amp, right?

[Bass Box]

Hi guys  :)

I want to make an amplifier for the bass box in my car (eg 100W). Can you recommend one of the circuits here, or you may have another one in another place  ;D

Thanx

[Field Effect Transistor]

Thank you so much  :)

[Field Effect Transistor]

Hi Audioguru

[Field Effect Transistor]

Hi,
How can I see if this effect transistor 2SK2605 works normally? should i test it just like the other transistors? you know a transistor has B C E , the 2SK2605 has Gate Drain Source.

Help  ;D

[Bass/Treble System]

Okay, I thank you again Audioguru for the support and I might ask many many times again in the future  ;D. I'll do what you recommended and i'm sure it will work better because i trust you  :).

I also wanna thank Staigen & Alun  ;D

Best wishes,
Mukhalled

[Bass/Treble System]

Thanks, Audioguru (my teacher  ;D) for the clear explanation.

So my amplifier is overloaded now  :-\, what can i do to not overload it (to make the impedance suitable, in other words 4ohms)? But the problem is that I'm a little bit stubborn  ;D, I wanna keep those five speakers ( 2 tweeters, 2 3-way speakers and 1 sub-woofer).  ???

I need your help
*Are you electronics engineer sir?

[Bass/Treble System]

Can't I measure impedance with ohmeter? ( with ohmeter I meant true RMS) isn't it the same thing? i may chose wrong word

[Bass/Treble System]

hi,

I had already seen the lables of the speakers and calculated the impedance of them. The tweeters 8ohms each, 3-way speakers 4ohms each and the woofer 6ohms. if we calculate the one side without the woofer it will be 2,67ohms impedance, but the woofer is connected to both sides so how shall I do?

[Bass/Treble System]

Hi Audioguru,
I didn't add 4ohms, it was just the ohmmeter which showed 4ohms.