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F5Turbo Illustrated Build Guide
F5Turbo Illustrated Build Guide
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Old 14th May 2019, 11:40 AM   #561
BigE is offline BigE  Canada
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Low efficiency is quieter
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Old 14th May 2019, 02:44 PM   #562
TboneAK is offline TboneAK  United States
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I know that’s part of it. Like 92dB at 1w/1m is about twice as loud. Previously to the F5T I was using a class D 2x100w (@4ohm) amp board with the dsp and speaks. Lots of volume. I’m not sure what the voltage gain of that amp is, but it lists gain at 30dB. The f5t ver. 2 that I built should have 20dB.

I will say that there is more bottom end and better clarity with the f5t. I’m not going to switch back, but I’m surprised, at how quiet it is. I’ll keep poking around. I’ll get some measurements soon.
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Old 14th May 2019, 05:47 PM   #563
BigE is offline BigE  Canada
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My F5T had noise measurements around -88 dB and lower, except for one channel's 120 Hz reading.

I moved a secondary circuit board to a different place, and it should have lowered it further. I will report when complete, but having some issues with one channel at the moment.
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Old 16th May 2019, 06:19 AM   #564
TboneAK is offline TboneAK  United States
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Well it’s confirmed 0.9vrms output from the dsp is not enough. I bypassed that and scrambled for the down button on my iPhone. We have enlightenment. Although I don’t know the output specs of that old iPhone 5s.
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Old 16th May 2019, 02:25 PM   #565
TboneAK is offline TboneAK  United States
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Correction, 4S. Yarra preamp parts are on the way.
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