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Older Activity
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Yesterday, 07:25 PM
You mean the problem's not just balloons for birthday parties and people making funny voices? ;)
24 replies | 354 view(s)
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Yesterday, 05:54 PM
Do you know why? We're actually running into short supply of Helium, and it's just going to keep getting worse.
24 replies | 354 view(s)
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Yesterday, 05:16 PM
What happens here is this - Qes is a measurement of electromagnetic damping of the driver's resonance. This is directly related to the amount of...
10 replies | 244 view(s)
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Yesterday, 05:06 PM
Very sad news indeed. What a tragedy, he was much too young.
12 replies | 581 view(s)
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Yesterday, 04:27 PM
I think you are on to something... just have to figure out how to reach your target market.... Hydrophiles
47 replies | 935 view(s)
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Yesterday, 11:51 AM
Phone pics . . . Finally painted. We install drivers today and get some measurements.
46 replies | 3002 view(s)
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05-22-2013, 11:52 PM
I'm building this amp for a Taiwanese company and they provided the heatsink and chassis for the prototype. I know I saw a nice chassis and heatsink...
13 replies | 314 view(s)
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05-22-2013, 11:44 PM
:D Good one!
Not only that, but the amp circuit includes active line filters that will reduce the 120Hz ripple by another 40dB.
13 replies | 314 view(s)
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05-22-2013, 10:02 PM
MOSFET.
Final bias level will be determined by what I consider to be a reasonable heat sink temperature. I've got 12 MOSFETs on each channel, so...
13 replies | 314 view(s)
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05-22-2013, 09:33 PM
Not sure where you saw that, but it's my own design. Class A/B, 250W. I'm aiming the bias to allow maybe 50W of class A operation before it reverts...
13 replies | 314 view(s)
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05-22-2013, 08:55 PM
For you amplifier lovers, here's a bit of :eek:
That's a quarter on the one power transformer.
I've got some work to do.
:D
13 replies | 314 view(s)
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05-22-2013, 07:51 PM
I did.
"Few tweeters will last long with sustained power at a level easily achieved with an overdriven 100W amplifier - they are simply not ...
41 replies | 843 view(s)
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05-22-2013, 06:21 PM
That's the point Frank. With MUSIC as the signal, the 100W amp delivering 50W RMS will be horribly distorted compared to the 500W amp delivering the...
41 replies | 843 view(s)
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05-22-2013, 05:14 PM
The difference is that with MUSIC as the signal, the amount of high frequency power is MUCH lower in the unclipped 50W signal.
50W RMS being...
41 replies | 843 view(s)
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05-22-2013, 04:33 PM
The blue paragraph is incorrect. If you drive both coils, whether in series, parallel, or if you drive both coils separately via two different...
10 replies | 244 view(s)
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05-22-2013, 10:23 AM
Get some cut with MDF and wrap them in vinyl. They make vinyl in all kinds of metallic look, including chrome.
51 replies | 5517 view(s)
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05-22-2013, 03:31 AM
xsundown, where do you live?
There may be a DIY'er nearby who would be glad to come by with a mic and woofer tester and actually design you a...
35 replies | 502 view(s)
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05-22-2013, 03:20 AM
I think that's backward IMO. An amp in clipping sounds louder than an amp not in clipping due to the extra harmonic content that is easily perceived...
41 replies | 843 view(s)
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05-21-2013, 11:47 PM
LMAO
How many vehicles can you hit in one intersection before leaving the pavement altogether?
http://www.liveleak.com/view?i=af1_1369050002
6 replies | 389 view(s)
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05-21-2013, 11:33 PM
That's the actual spectral content not limited by digital sampling rates.
The first plot has peaks just under the voltage rail of the amp. The...
41 replies | 843 view(s)
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05-21-2013, 10:42 PM
10 parts.
5 for the woofer and 5 for the tweeter.
Woofer:
2.7mH
5.6uF
.3mH
125uF
9 Ohm
35 replies | 502 view(s)
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05-21-2013, 10:37 PM
I'll let the readers decide which has more high frequency information.
Guess which plot is clipped.
41 replies | 843 view(s)
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05-21-2013, 09:21 PM
One more thing - I can send you the frd files for the woofer and the passive radiator if you want to load them into something and sum them yourself. ...
50 replies | 1090 view(s)
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05-21-2013, 08:51 PM
Do you like the way we hid something useful and informative in a thread no one sees?
50 replies | 1090 view(s)
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05-21-2013, 08:50 PM
It's the latter. You can see all of that in this graph:
50 replies | 1090 view(s)
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05-21-2013, 08:43 PM
;) Several years ago on the old Mad board Dave Ellis posted that everytime he ate popcorn and listened to music everything about the music sounded...
50 replies | 1090 view(s)
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05-21-2013, 07:29 PM
Point taken. But it's not the low frequencies that are being compressed. Have a look at the harmonic content of a square wave. The peak amplitude...
41 replies | 843 view(s)
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05-21-2013, 05:43 PM
I did some more with this today, so I could best understand what was happening. I was able to save out the port response from 1Hz to 20khz with phase...
50 replies | 1090 view(s)
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05-21-2013, 05:12 PM
Yes.
2 replies | 81 view(s)
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05-21-2013, 04:49 PM
Clipping can be very harmful to tweeters SirNickity. When an amp clips, it generates a large number of high frequency harmonics that are not present...
41 replies | 843 view(s)
- Date of Birth
- November 18, 1960 (52)
About dthomas
- Location:
- Dallas, TX
- Occupation:
- Engineering Consultant
Dave
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If you are reading it in English thank a Veteran.
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