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Old 11th August 2012, 07:47 PM   #351
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Little Progress with TeaBag's boards
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Old 11th August 2012, 08:02 PM   #352
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Fugly!

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Old 11th August 2012, 08:32 PM   #353
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Gratzie!
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Old 12th August 2012, 02:24 AM   #354
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Great! Nice heatspreader setup.
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Old 14th August 2012, 04:08 PM   #355
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by buzzforb View Post
Little Progress with TeaBag's boards
Love the diode heatsinks...perfect for my solution.

Size of your main heatsink is ?

Looking forward to your findings driving that board really hard.
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Old 14th August 2012, 06:13 PM   #356
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I dont know how much i can push them. Two 12" XXLS woofers wired in parallel, playing at uncomfortable levels wasnt pushing them. I'll give it my best attempt. I have considered adding the other 2 pairs of devices, making Rs 1 ohm, and cutting biad through each fet to 400mA. IT seems like the wrong direction, but i just read how the XA160.5 has each fet biased at only 7watts. I was quite shocked at this and perhaps read it wrong, but it has me considering the benefits/consequences of more pairs at lower bias, vs less pairs at higher bias.
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Old 14th August 2012, 07:35 PM   #357
a.wayne is offline a.wayne  United States
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Easy , More Prs with lower Bias.... A friend has the XA30.5, i cant get over how cool it runs, nothing like an F5 ..
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Old 14th August 2012, 08:19 PM   #358
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It was definitely interesting to read how low the XA.5 amps were biased. I know they are SUSY and haev other mechanisms at work that I do not fully understand, but interesting none the less. I have the amp together and fighting whether to strip it and paint it. I know if i finish it and begin to listen, I will take forever to actually paint and finish.
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Old 14th August 2012, 08:50 PM   #359
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well , not exactly low biased , if you read what's written in datasheet for each one

30.5 - 113W/ch

160.5 - 250W/ch

dissssssssipation , of course
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Old 14th August 2012, 08:53 PM   #360
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Thanks for more complete info, but still a low per fet bias. Question? Does the transconductance of multiple pairs add causing a reduction in noise and distortion? Also, I think I remember Nelson saying that multiple pairs alos had a beneficial effect on Capacitance and drive/bandwidth issues.
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