Hi Tonza,
Alumina ceramic is best, see this post,
for grease I use some generic stuff, not electric conducting.
Yep, the bass is passive, two 10" Alcones matches with the Accuton mid for sensitivity.
Alumina ceramic is best, see this post,
for grease I use some generic stuff, not electric conducting.
Yep, the bass is passive, two 10" Alcones matches with the Accuton mid for sensitivity.
Strange,
the schematics on page 1 show all 0.12 for R132
BOM needs to be adjusted ?
Grts,
Danny
Carrera - undefinition
Sensitivity: 83-84 dB ? Theoretical I suppose.
Min impedance: about 5.2 ohms.
Sorry, you say:
Music with low/very low DR?
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Glad it is all working and singing well for you Zman. Enjoy!
I certainly just listen to my Alpha BB lately now maybe 5 hrs a day - conveniently as I sit at my computer working on writing, the amp is playing my favorites on a playlist. It’s hard to leave the speakers and amp when I have to finally power down at 2am for the next day.
I certainly just listen to my Alpha BB lately now maybe 5 hrs a day - conveniently as I sit at my computer working on writing, the amp is playing my favorites on a playlist. It’s hard to leave the speakers and amp when I have to finally power down at 2am for the next day.
Hugh,
I found an old HiFi Classic review that had impedance curve specs for my Forte speakers and I’m very surprised with huge variation in impedance(even though they are labeled 8ohm):
“The system's minimum impedance was 4 ohms at 150 Hz, which was also the frequency of its maximum output. The impedance rose to a peak of 20 ohms at 65 Hz, then dropped back to 5 ohms at 42 Hz, rising again to about 19 ohms at 20 Hz. It reached an unusually high 130 ohms at 2,200 Hz, then descended to the range of 8 to 12 ohms between 6,000 and 20,000 Hz.”
So, given that the impedance drops below 6ohms for frequency’s that require the most power, I think I will increase my ALPHA20 bias. Thanks.
Cheers,
Vunce
I found an old HiFi Classic review that had impedance curve specs for my Forte speakers and I’m very surprised with huge variation in impedance(even though they are labeled 8ohm):
“The system's minimum impedance was 4 ohms at 150 Hz, which was also the frequency of its maximum output. The impedance rose to a peak of 20 ohms at 65 Hz, then dropped back to 5 ohms at 42 Hz, rising again to about 19 ohms at 20 Hz. It reached an unusually high 130 ohms at 2,200 Hz, then descended to the range of 8 to 12 ohms between 6,000 and 20,000 Hz.”
So, given that the impedance drops below 6ohms for frequency’s that require the most power, I think I will increase my ALPHA20 bias. Thanks.
Cheers,
Vunce
Hi Hugh,
It was because Zman used 0.165r (2x0.33) for sensor with 0.33r emitter.
I proposed to use 0.11r (3x0.33) or 0.12 for sensor.
Grts,
Danny
F..k had to goto doctor , took the tests . Fever/flu 38.5C feeling a lot weaker. 3 days of work
Danny can you simulate the amp with a loudspeaker as load ? there the png
I think i goto bed.
Attachments
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Most of that sounds pretty reasonable, it’s the 5ohms at 42Hz that’s a bit problematic, but there is not much content there except for open G on a bass. A lot of the sins of a crossover are absolved with 99dB sensitivity. Basically it doesn’t require much current at all. With higher bias you should hear improved bass authority when listening to bass guitar or more HT type stuff. Most music bass with kick drums is at 55Hz low. The 110ohms at 2kHz means the speaker is acting alimony like a liar of headphones impedance wise. The only cure here is higher voltage, but Alpha 20 can swing +/-15v easily so that will sound good unless you are playing very loud.
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Thanks for the input X.
Danny,
Since the cpu coolers work so well, I will change the appropriate resistors to increase bias to 1.46A and give a listen.
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If you have the .asc file I can plug it in, otherwise you can find my ltspice files a few pages back.
Grts,
Danny
