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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 26 May 2018, 18:05

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PostPosted: 13 May 2018, 08:54 
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Joined: 28 May 2008, 21:53
Posts: 4548
Location: Winnipeg, CANADA
Hi. The impedance response of the enclosure is shown a few posts back.

From the impedance plot, the box tuning frequency is about 63 Hz. The calculated tuning frequency of the enclosure dimensions was 72Hz. The difference between the two frequencies presumably being the effect of the damping material in the speaker system.

The insulation material used was brown fiberglass R12 insulation from a big box home center. The difference between the two is that mineral wool insulation is denser and will absorb more sound. That could be the issue.
Also note that the insulation is stapled about every 4 inches so that also compresses the insulation.


[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]

PostPosted: 14 May 2018, 21:34 

Joined: 14 May 2018, 16:30
Posts: 1
Hi mate,
Nice job they look great what are the measurements of the cabintes looking at building the same with the same drivers from audio nirvana.

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