Search found 117 matches

by greenmanhumming
Sat Apr 10, 2010 8:03 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

heres the overall response with tweeter at 12dB/8ve

75cm same setup as before. some improvement, the dip is much worse with the phase reversed.

Image
by greenmanhumming
Sat Apr 10, 2010 7:34 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

i'll bypass that 33n cap and test at 12dB/8ve

what do you think about the no xover graphs?
by greenmanhumming
Sat Apr 10, 2010 7:32 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

and heres the tweeter no xover low level (you can see ambient rumble and room noise)

hope its accurate enough, could maybe try slightly higher level if needed.

Image
by greenmanhumming
Sat Apr 10, 2010 7:26 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

ok heres the woofer no xover 10cm reasonable level.

Image
by greenmanhumming
Sat Apr 10, 2010 7:18 pm
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

OK, but yikes, should i protect the tweeter in some way or is a just low level enough? these tweeters are not replaceable. ceramic dome from early 90s not made anymore etc... is fuse or a big cap better? while i do that, if i want to try the tweeter at 12dB /8ve what do i do, just remove the inductor?
by greenmanhumming
Sat Apr 10, 2010 11:49 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

looks to me like it could be improved by simply letting more highs thru the woofer, what effect would reducing the 82n and 8.2n caps to 68n and 6.8n have? too much?
by greenmanhumming
Fri Apr 09, 2010 10:46 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

top woofer active at 13cm http://www.greenmanhumming.com/activwooftop13cm.jpg top woofer passive at 13cm http://www.greenmanhumming.com/passwooftop13cm.jpg bottom woofer active at 13cm http://www.greenmanhumming.com/activwoofbottom13cm.jpg bottom woofer passive at 13cm http://www.greenmanhumming.com...
by greenmanhumming
Fri Apr 09, 2010 10:33 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

tweeter active at 10cm
Image

tweeter passive at 10cm
Image
by greenmanhumming
Fri Apr 09, 2010 10:19 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

oops the above was not done at 10cm, did it in a rush... it was the same 75cm as before
by greenmanhumming
Fri Apr 09, 2010 9:36 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

activetweeter
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passivetweeter
Image

activewoofers
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passivewoofers
Image
by greenmanhumming
Fri Apr 09, 2010 9:22 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

400Hz will be room/mic distance related since it is the same in the passive and active. that would explain why its less prominent on the iphone graph where the distance was probably different. Need a graph of the passive tweeter and active tweeter done as about 10cm. To see how different the tweete...
by greenmanhumming
Fri Apr 09, 2010 8:44 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

what do you think the notch at 400hz is?
by greenmanhumming
Fri Apr 09, 2010 8:44 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

inphase
Image

reversed
Image
by greenmanhumming
Fri Apr 09, 2010 8:36 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

the 2k notch is approx 3dB deeper with the phase reversed.
want the graph?
by greenmanhumming
Fri Apr 09, 2010 1:24 am
Forum: JLM Audio Kits
Topic: JLM 60Watt Power AMP Kit
Replies: 261
Views: 701080

Re: JLM 60Watt Power AMP Kit

when you modeled this I'm presuming you modeled it with two woofer amps fed in parallel from the same source? I'm looking for causes of that notch at 2k and I wondered if the mid could be rolling off too low due to paralleling the filters at the inputs of the woofer amps? I assume the 1k resistors a...