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Topping D90LE - "Valve" and "Transistor" effects measurements

restorer-john

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To add a basically but not utterly irrelevant aside, if I may: ;)

Long, long ago, there was a flurry of "sub-bass synthesizer" products (all analog, AFAIK) that did the same thing, but in the other direction (i.e., added some signal at half the fundamental frequency).

View attachment 214612source: https://worldradiohistory.com/Archive-All-Audio/Archive-High-Fidelity/70s/High-Fidelity-1978-09.pdf

This one may have just been a tone control, though, for all I know.

View attachment 214613
source: https://www.radioshackcatalogs.com/flipbook/1983_radioshack_catalog.html?fb3d-page=92

N.B. Note that I didn't say these products worked well. ;)

The Realistic Bass enhancer is a great little product. The only real issue with it is residual noise. It's basically a parametric EQ with a very good subsonic filter, so good for both vinyl and small speakers.

It was an add-on sold with Minimus 7 and other small speakers for years.

I've got one here and ran some FR plots on it a while back if anyone is interested in seeing what it does.
 
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mhardy6647

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I've got one here and ran some FR plots on it a while back if anyone is interested in seeing what it does.
Well... I mean... I would be :)
Not sure anyone else'd care, though... but if you feel like starting a little thread sometime, I'll read it!
 
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