| 00:10.45 | arossdotme | DocScrutinizer05, ok thanks for the education! :) |
| 00:10.52 | arossdotme | I feel better about it now |
| 00:10.59 | DocScrutinizer05 | yw :-) |
| 00:12.02 | arossdotme | currently i have soldered a short 15-20cm cable to it |
| 00:12.32 | DocScrutinizer05 | then you probably can forget about the ferrites all together |
| 00:12.57 | DocScrutinizer05 | mind you, the speaker itself is a huge inductivity |
| 00:13.01 | arossdotme | and if it was few meters? |
| 00:13.32 | DocScrutinizer05 | then you could tell from 50m distance if the speaker is on or not, by using a shortwave AM radio |
| 00:13.51 | DocScrutinizer05 | worst case, prolly not |
| 00:14.06 | arossdotme | oh right cool! |
| 00:14.34 | DocScrutinizer05 | you should short the ferrite chokes if you plan to do that ;-) |
| 00:14.56 | DocScrutinizer05 | then it might make for a poor AM transmitter |
| 00:15.25 | arossdotme | but truely i want them to do there thing, but im conscious to see what it sounds like now. |
| 00:15.27 | DocScrutinizer05 | just like any other switched mode PSU |
| 00:16.09 | arossdotme | like those dc-dc boost and/or buck converters i have.... |
| 00:16.21 | DocScrutinizer05 | a class-D amp basically is nothing more than just a variable switched mode power supply |
| 00:16.49 | arossdotme | diff way of thinking about it, i thought about more like pwm light dimming... |
| 00:17.06 | DocScrutinizer05 | roughly the same |
| 00:17.20 | arossdotme | hmm |
| 00:17.23 | arossdotme | mmh |
| 00:17.47 | arossdotme | i was going to use this mono amp for a subwoofer with a preamp bass/subwoofer frequency filter board |
| 00:18.08 | DocScrutinizer05 | sounds like an excellent idea |
| 00:20.30 | 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 |
| 00:20.48 | arossdotme | count=couldnât |
| 00:22.32 | DocScrutinizer05 | the volume controls would be in your preamp freq filter anyway, no? |
| 00:22.51 | DocScrutinizer05 | but an AB is quite power hungry compared to D |
| 00:22.57 | arossdotme | in my diy dolution yes |
| 00:23.28 | arossdotme | yea it had a large flat bent sheet of au attached to it |
| 00:23.41 | DocScrutinizer05 | :nod: |
| 00:24.19 | arossdotme | or via the pc surround sound subwoofer output vol ;) |
| 00:24.43 | arossdotme | heh out with the old in with the new :) |
| 00:24.56 | DocScrutinizer05 | sure. Yet I'd use the preamp incl vol control, even when you feed its input with 5/1 |
| 00:25.14 | arossdotme | yea |
| 00:25.27 | DocScrutinizer05 | just don't use the freq filter |
| 00:25.35 | DocScrutinizer05 | when doing 5/1 |
| 00:25.56 | DocScrutinizer05 | but the level controls (and tone controles) will still come in handy |
| 00:25.57 | arossdotme | oh |
| 00:26.07 | arossdotme | dont use freq filter? |
| 00:26.29 | arossdotme | with using pc sub output? |
| 00:26.36 | arossdotme | with=when |
| 00:26.39 | DocScrutinizer05 | when you use 2/1 or 4/1 or 5/1? what for would you need the frequency filter there? |
| 00:27.20 | DocScrutinizer05 | well, you still can feed the subwoofer output from PC to the lowpass filter in of your preamp |
| 00:27.56 | 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 |
| 00:27.59 | DocScrutinizer05 | just don't feed subwoofer signal to the normal stereo inpuits or vice versa in that case |
| 00:29.24 | arossdotme | oh by 2/1 ,etc you mean 2.1 surround sound. |
| 00:29.42 | arossdotme | not vol level |
| 00:29.49 | 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 |
| 00:29.56 | arossdotme | yes |
| 00:29.57 | DocScrutinizer05 | yes |
| 00:30.36 | DocScrutinizer05 | for 2.1 or 4.1 or 5.1 you feed only .1 to that input |
| 00:31.12 | arossdotme | yea, i know what you mean :) |
| 00:31.21 | 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 |
| 00:32.55 | DocScrutinizer05 | yep, exactly |
| 00:33.18 | 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 :/ |
| 00:33.19 | 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 |
| 00:35.24 | 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 |
| 00:35.36 | arossdotme | (not for subwoofer btw) |
| 00:36.01 | arossdotme | but then i can use device software filters and same some weight |
| 00:36.33 | arossdotme | arr but then it is also a preamp which is good for weaker out vol devices... |
| 00:39.10 | DocScrutinizer05 | (same but cheaper) yes, looks like. |
| 00:43.38 | DocScrutinizer05 | the last one looks completely bogus. No or absolutely nonsensical specs |
| 00:44.29 | DocScrutinizer05 | "function: power triode" WTF?! |
| 00:44.42 | DocScrutinizer05 | "usage: Zener diode" |
| 00:46.07 | 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 |
| 00:46.31 | DocScrutinizer05 | s/ no / to / |
| 00:46.31 | 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" |
| 00:51.19 | 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)" |
| 00:56.31 | arossdotme | oh right i see the aliexpress specs selection has the wrong data in it urrg, someone was lazy |
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