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-   -   NAD 3020 Loudness (https://www.diyaudio.com/forums/solid-state/360257-nad-3020-loudness.html)

Guerilla 16th September 2020 08:04 PM

Pobably the same frequencies as bass and treble knobs

Cheers!

planet10 16th September 2020 11:44 PM

2 Attachment(s)
Circuit from the service manual and the prose from the owener’s manual. I never used it on any of my NAD 3020/7020/1020.

dave

presscot 19th September 2020 01:01 PM

I've got the specs! Here is the info for those who are seeking like me. Bass is boosted at 50Hz and Treble is boosted at 10kHz. Regrettably, levels are unknown.

My another question unrelated to this thread; as seen that the loudness contour is usually boosted at the same frequencies as bass/ treble knobs, then, can it be boosted over the tone control's dB range?

OldDIY 19th September 2020 02:04 PM

1. The levels depend on the angle of rotation of the volume control.
2. A normal tone control operates at the same frequencies.
Avoid overloading the amplifier and speakers (and neighbors).

presscot 19th September 2020 03:59 PM

Quote:

Originally Posted by OldDIY (https://www.diyaudio.com/forums/solid-state/360257-nad-3020-loudness-post6346654.html#post6346654)
1. The levels depend on the angle of rotation of the volume control.
2. A normal tone control operates at the same frequencies.
Avoid overloading the amplifier and speakers (and neighbors).

I know that a good loudness circuit should vary levels depend on volume. But many other manufacturers often show the loudness level specs at a reference volume, not sure, usually @ -30dB. For the tone control, I’m wondering if the limit of boost/ cut range is +/- 5 dB, can we design the loudness that boost over 5 dB, say approximately +10dB?

OldDIY 19th September 2020 04:42 PM

Equal loudness curves
https://fierymusic.ru/wp-content/upl...Me%60nsona.jpg

PRR 20th September 2020 01:50 AM

1 Attachment(s)
Quote:

Originally Posted by planet10 (https://www.diyaudio.com/forums/solid-state/360257-nad-3020-loudness-post6343833.html#post6343833)
Circuit from the service manual...


presscot 20th September 2020 07:32 AM

#17, Great, does this curve come from program simulation or actual measurement?


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