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Low frequencies on my 1972 Heresies & H/K 430


MeloManiac

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Perhaps this is something I can brag about?!

After I cleaned my recently acquired Harman Kardon 430 twin powered amplifier, especially after applying deoxit, I noticed improvement in the sound quality: it lost a bit of its 'warmth'  and came closer to 'neutral' representation of the recording.

I also noticed impressive bass improvement, something the H/K430 has a reputation for. So today I thought I would do some measurements. I used the app Spectroid on my Huawei smartphone. I know, no scientific tool, but I think it is pretty accurate.

I used Massive Attack's Unfinished Sympathy, a song that starts with some really low bass notes (which re-appear again later in the song).

Spectroid works in realtime, so I took a screenshot of the first couple of seconds. And loo and behold, the lowest frequency measured is something like 29Hz, which is much lower than the offical specs of the Heresies!

 

Screenshot_20201113_122834.jpg

Screenshot_20201113_121218_org.intoorbit.spectrum.jpg

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