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Old 8th January 2014, 11:13 PM   #1451
davym is offline davym  Scotland
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Thanks Dario, think i'll just use what they send me though

Those Mundorf 10,000uF PSU caps are expensive! glad I'm not building a class A monster using them
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Old 8th January 2014, 11:31 PM   #1452
davym is offline davym  Scotland
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Should I go for 40V or 63V PSU caps folks?
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Old 9th January 2014, 05:56 AM   #1453
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Should I go for 40V or 63V PSU caps folks?
If they fit, 63V caps will generally have lower Dissipation Factor than 40V, other things being equal. I'd go with 63V.
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Old 9th January 2014, 01:10 PM   #1454
bcmbob is offline bcmbob  United States
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A Precautionary Tale

This won't apply to most builders but I thought I'd share it anyway. The new beta installation was starting to distort on one side. I disassembled to reheat everything and check for other problems. No help. I decided to just replace the LM3886, and as I started discovered pin #11 wasn't attached at the junction (bottom) of the chip. That's a NC pin, but I realized over the months I had often flexed all the pins excessively by leaving the small heatsink attached (added leverage) while doing some sort of mod or adjustment. So, no doubt one or more of the active pins had lost contact.
The LM3886 is a rugged device but being flexed that much - that many times had to cause a problem sooner or later. I was able to successfully remount a pulled LM3886 and the sound is fine now. But I wanted to share the story cause so many of those little shortcuts (read - lazy) we gamble with usually get us eventually. The time saved rarely balances out in the long run.
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Old 9th January 2014, 09:01 PM   #1455
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What a nice looking heatsink. Copper to spread the heat and nice ally fins. It's even better looking than Dario's prototype heat sink. Would you care to share the source?

Jac
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Old 9th January 2014, 11:01 PM   #1456
bcmbob is offline bcmbob  United States
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I wish I could. I bought about eight on eBay several years ago for a video render farm. Others have asked and I've searched several times for the vendor unsuccessfully. It was a surplus PC parts store in California but they disappeared. You might find something similar on eBay with keyword AMD Opteron or socket F cooler/heatsink. The laminated design helped keep the profile down for 1U server blades. If I find some more I'll post.
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Old 10th January 2014, 01:39 AM   #1457
bcmbob is offline bcmbob  United States
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Made it through the snowbank!

The RC build arrived in tact in Denver today. Jim will give us an independent review and maybe a few scope readings if we ask nice.

The 2-day delivery took 6 due to weather but the mail gorillas left it in good shape.

stay tuned.......
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Old 10th January 2014, 09:48 AM   #1458
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by 1543 View Post
............as long the amplification is done after crossovers it is called active speaker. Independend if amps and crossovers are inside or outside of the cabinet.......
correct.

A passive multi-way speaker is one that has the passive crossover components between the Power amplifier/s and the speaker drivers.

An active multi-way speaker is one that has the crossover components before the separate Power Amplifiers feed the respective speaker drivers.

As an aside, an active speaker can have a passive crossover! The amplifiers directly feed the respective drivers.
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Old 10th January 2014, 01:37 PM   #1459
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My k71-4 impression: sound is good. Top range is emphasized, mid range is lean and lows are not bad but lack some punch and grip. But overall sound is not as good as audyn TC. Price quality is great anyway.

Noticed this capacitor gives faster sound than TC which I really like.
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Old 10th January 2014, 02:00 PM   #1460
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No. Do not like it in c13.
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