Hello from "I have no idea how audio works" -ville

am60 · 20th March 2010, 11:03 PM

Please don't take my title to this post as anything but fact. I listened to a Philips MCD708 MicroDVD Home stereo unit at work and was blown away at the sound quality. I beleive it had a class D amp this with ribbon tweeters. to my ears is the best I ever heard.
I have no education to back up my interest, maybe the forums here are way over my head??? Or can I learn basic things?
I have posted the question about 'adding a sub out rca jack' to a TA2020 rig I ordered on ebay. So as the over analyzer I am, Is the question too rudimentary to be asked?

picowallspeaker · 20th March 2010, 11:33 PM

Yes ,hello !
Have you seen "The great R&R swindle" ?
The forum is not a swindle..but often anyone may get fooled by what he/she hears . I don't dig much of digital treatment of the sound .At low level our ear is very sensitive to subtle changes , so a correct equalized (corrected ,maybe..)
sound ,specially when a brand can manage to engineer every stage from start to end ,it's like a tailors' suit ,it may "fit" you perfectly .
Regarding your question...it is general agreement that subwoofer filtration and equalization must be done at line level (RCA plugs...).
G'bye !

wakibaki · 20th March 2010, 11:34 PM

Hi am60,

We all have limits to what we know. AFAIK nobody here objects to rudimentary questions.

Over analyzing, however, is another matter. It' does you no good, and it's downright irritating for a spectator.

w

...or so my wife says.

am60 · 20th March 2010, 11:39 PM

Regarding your question...it is general agreement that subwoofer filtration and equalization must be done at line level (RCA plugs...).

Line level = output to speakers??????????????
See I don't know!

picowallspeaker · 21st March 2010, 12:03 AM

Hey ! You make me thinking .
"Line level" is a signal strong enough to drive an amplifier's input ,from 0,1 to 2 Volt...
Same level we find in portable equipment like walkman or cd ,that work on 1-3 volt batteries ,but is a little stronger ,'cause it has some current to drive little headphones (which are little..speakers!),so it's amplified (very few hundreds of a Watt ).
Same level we find at the output of various gear ,cd-players ,tuners,DACs but not microphones or pick-ups in turntables,which have to pass another stage of amplification to reach the "line level" status.The lower the tension ,the higher the precaution in shielding the signal from interferences .Once it is beefed up in current and tension by a power amplifier , it may eventually "drive" something properly (a driver ????! eh

)

am60 · 21st March 2010, 12:09 AM

This is only the line level I can use.

picowallspeaker · 21st March 2010, 12:31 AM

I used to have the same motorcycle that Syd Vicious rode in that movie
(a Honda CB 400 Twin ...pure junk!!!)

am60 · 21st March 2010, 12:48 AM

So with the info that I have now acquired I will open the case of the Chinese amp, close my eyes stick my finger roughly half way on the pcb and connect the sub to this point!

20th March 2010, 11:03 PM	#1
am60 diyAudio Member Join Date: Mar 2010	Hello from "I have no idea how audio works" -ville Please don't take my title to this post as anything but fact. I listened to a Philips MCD708 MicroDVD Home stereo unit at work and was blown away at the sound quality. I beleive it had a class D amp this with ribbon tweeters. to my ears is the best I ever heard. I have no education to back up my interest, maybe the forums here are way over my head??? Or can I learn basic things? I have posted the question about 'adding a sub out rca jack' to a TA2020 rig I ordered on ebay. So as the over analyzer I am, Is the question too rudimentary to be asked?

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20th March 2010, 11:33 PM	#2
picowallspeaker diyAudio Member Join Date: Apr 2007	Yes ,hello ! Have you seen "The great R&R swindle" ? The forum is not a swindle..but often anyone may get fooled by what he/she hears . I don't dig much of digital treatment of the sound .At low level our ear is very sensitive to subtle changes , so a correct equalized (corrected ,maybe..) sound ,specially when a brand can manage to engineer every stage from start to end ,it's like a tailors' suit ,it may "fit" you perfectly . Regarding your question...it is general agreement that subwoofer filtration and equalization must be done at line level (RCA plugs...). G'bye !

20th March 2010, 11:34 PM	#3
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	Hi am60, We all have limits to what we know. AFAIK nobody here objects to rudimentary questions. Over analyzing, however, is another matter. It' does you no good, and it's downright irritating for a spectator. w ...or so my wife says.

20th March 2010, 11:39 PM	#4
am60 diyAudio Member Join Date: Mar 2010	Regarding your question...it is general agreement that subwoofer filtration and equalization must be done at line level (RCA plugs...). Line level = output to speakers?????????????? See I don't know!

21st March 2010, 12:03 AM	#5
picowallspeaker diyAudio Member Join Date: Apr 2007	Hey ! You make me thinking . "Line level" is a signal strong enough to drive an amplifier's input ,from 0,1 to 2 Volt... Same level we find in portable equipment like walkman or cd ,that work on 1-3 volt batteries ,but is a little stronger ,'cause it has some current to drive little headphones (which are little..speakers!),so it's amplified (very few hundreds of a Watt ). Same level we find at the output of various gear ,cd-players ,tuners,DACs but not microphones or pick-ups in turntables,which have to pass another stage of amplification to reach the "line level" status.The lower the tension ,the higher the precaution in shielding the signal from interferences .Once it is beefed up in current and tension by a power amplifier , it may eventually "drive" something properly (a driver ????! eh )

21st March 2010, 12:09 AM	#6
am60 diyAudio Member Join Date: Mar 2010	This is only the line level I can use.

21st March 2010, 12:31 AM	#7
picowallspeaker diyAudio Member Join Date: Apr 2007	I used to have the same motorcycle that Syd Vicious rode in that movie (a Honda CB 400 Twin ...pure junk!!!)

21st March 2010, 12:48 AM	#8
am60 diyAudio Member Join Date: Mar 2010	So with the info that I have now acquired I will open the case of the Chinese amp, close my eyes stick my finger roughly half way on the pcb and connect the sub to this point!

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