00:10 <arossdotme> DocScrutinizer05, ok thanks for the education! :)

00:10 <arossdotme> I feel better about it now

00:10 <DocScrutinizer05> yw :-)

00:12 <arossdotme> currently i have soldered a short 15-20cm cable to it

00:12 <DocScrutinizer05> then you probably can forget about the ferrites all together

00:12 <DocScrutinizer05> mind you, the speaker itself is a huge inductivity

00:13 <arossdotme> and if it was few meters?

00:13 <DocScrutinizer05> then you could tell from 50m distance if the speaker is on or not, by using a shortwave AM radio

00:13 <DocScrutinizer05> worst case, prolly not

00:14 <arossdotme> oh right cool!

00:14 <DocScrutinizer05> you should short the ferrite chokes if you plan to do that ;-)

00:14 <DocScrutinizer05> then it might make for a poor AM transmitter

00:15 <arossdotme> but truely i want them to do there thing, but im conscious to see what it sounds like now.

00:15 <DocScrutinizer05> just like any other switched mode PSU

00:16 <arossdotme> like those dc-dc boost and/or buck converters i have....

00:16 <DocScrutinizer05> a class-D amp basically is nothing more than just a variable switched mode power supply

00:16 <arossdotme> diff way of thinking about it, i thought about more like pwm light dimming...

00:17 <DocScrutinizer05> roughly the same

00:17 <arossdotme> hmm

00:17 <arossdotme> mmh

00:17 <arossdotme> i was going to use this mono amp for a subwoofer with a preamp bass/subwoofer frequency filter board

00:18 <DocScrutinizer05> sounds like an excellent idea

00:20 <arossdotme> got a good condition pc one but with built in amp but it was missing the ext vol controller so i count use it, looked up the datasheets but it wasnt clear what to do. it used a car ab amp chip. i decided it was easier to gut are replace with a nice little class d amp board

00:20 <arossdotme> count=couldn’t

00:22 <DocScrutinizer05> the volume controls would be in your preamp freq filter anyway, no?

00:22 <DocScrutinizer05> but an AB is quite power hungry compared to D

00:22 <arossdotme> in my diy dolution yes

00:23 <arossdotme> yea it had a large flat bent sheet of au attached to it

00:23 <DocScrutinizer05> :nod:

00:24 <arossdotme> or via the pc surround sound subwoofer output vol ;)

00:24 <arossdotme> heh out with the old in with the new :)

00:24 <DocScrutinizer05> sure. Yet I'd use the preamp incl vol control, even when you feed its input with 5/1

00:25 <arossdotme> yea

00:25 <DocScrutinizer05> just don't use the freq filter

00:25 <DocScrutinizer05> when doing 5/1

00:25 <DocScrutinizer05> but the level controls (and tone controles) will still come in handy

00:25 <arossdotme> oh

00:26 <arossdotme> dont use freq filter?

00:26 <arossdotme> with using pc sub output?

00:26 <arossdotme> with=when

00:26 <DocScrutinizer05> when you use 2/1 or 4/1 or 5/1? what for would you need the frequency filter there?

00:27 <DocScrutinizer05> well, you still can feed the subwoofer output from PC to the lowpass filter in of your preamp

00:27 <arossdotme> so when im not using a source that is already filtered for a subwoofer which i assume the pc sub out is, it can work

00:27 <DocScrutinizer05> just don't feed subwoofer signal to the normal stereo inpuits or vice versa in that case

00:29 <arossdotme> oh by 2/1 ,etc you mean 2.1 surround sound.

00:29 <arossdotme> not vol level

00:29 <DocScrutinizer05> when you feed normal stereo to your audio system, you mix both channels L+R and feed it to the input of the mono subwoofer lowpass filter

00:29 <arossdotme> yes

00:29 <DocScrutinizer05> yes

00:30 <DocScrutinizer05> for 2.1 or 4.1 or 5.1 you feed only .1 to that input

00:31 <arossdotme> yea, i know what you mean :)

00:31 <arossdotme> something like this http://www.aliexpress.com/item/Low-pass-Filter-Finished-Board-Subwoofer-Crossover-Board-Deep-Bass-Single-Supply-DC10-24V-for-2/32461218097.html?ws_ab_test=searchweb201556_9,searchweb201602_2_10037_10034_507_10032_508_10020_10017_10005_10006_10021_10022_10018_10019,searchweb201603_7&btsid=bc9371c7-2125-49ad-9c26-d0e69b09b0fd

00:32 <DocScrutinizer05> yep, exactly

00:33 <arossdotme> same but even cheeper. diff? no tracked shipping which is ok cus it makes it double the price but they also dont say if they use Phillips caps... hmm :/

00:33 <arossdotme> http://www.aliexpress.com/item/Low-Pass-Filter-Plate-Subwoofer-Preamp-Board-2-1-3-Channel-DC-10-24V-22Hz-300Hz/32590327578.html?ws_ab_test=searchweb201556_9,searchweb201602_2_10017_10005_10006_10034_10021_507_10022_10020_10018_10019,searchweb201603_7&btsid=cc77f865-b72c-4a36-b7f5-2c767da007df

00:35 <arossdotme> only one cap hmm :/ ? but nice and compact + its got a mid pot! :D but no balance... http://www.aliexpress.com/item/preamp-Stereo-NE5532-Tone-Board-Preamplifier-Volume-Treble-Bass-Super-LM1036/32613173971.html?ws_ab_test=searchweb201556_9,searchweb201602_2_10017_10005_10006_10034_10021_507_10022_10020_10018_9999_10019,searchweb201603_7&btsid=6c791000-8669-4f87-b60e-d76e54779cc8

00:35 <arossdotme> (not for subwoofer btw)

00:36 <arossdotme> but then i can use device software filters and same some weight

00:36 <arossdotme> arr but then it is also a preamp which is good for weaker out vol devices...

00:39 <DocScrutinizer05> (same but cheaper) yes, looks like.

00:43 <DocScrutinizer05> the last one looks completely bogus. No or absolutely nonsensical specs

00:44 <DocScrutinizer05> "function: power triode" WTF?!

00:44 <DocScrutinizer05> "usage: Zener diode"

00:46 <DocScrutinizer05> also a really decent design would filter out the subwoofer frequencies from the (normal) stereo branch, no not torture small mid/treble speakers with very low and high amplitude frequencies

00:46 <DocScrutinizer05> s/ no / to /

00:46 <qi-bot> DocScrutinizer05 meant: "also a really decent design would filter out the subwoofer frequencies from the (normal) stereo branch, to not torture small mid/treble speakers with very low and high amplitude frequencies"

00:51 <arossdotme> DocScrutinizer05, sorry i was ot, that last one was not for subwoofer but for my diy boombox. sorry. thats what i ment by "(not for subwoofer btw)"

00:56 <arossdotme> oh right i see the aliexpress specs selection has the wrong data in it urrg, someone was lazy