restorer-john
Grand Contributor
Input impedance of the analyzer is 100 kHz:
Typo: 100k Ohms.
Input impedance of the analyzer is 100 kHz:
No, in-line RC filters are working OK only when plugged into the high input impedance of a (pre)amplifier.What happens if you stack two of them? Do you get 24dB/oct?
What happens if you stack two of them? Do you get 24dB/oct?
I thought these were 'the' Harrison PA guys from the UK, known for their amps and consoles but it's probably a one 'tin foil' hat man company:I wonder if they do tours of their 'laboratory'
I think that's the engineering name for it but doesn't suggest why use it, while its marketing name does. After all, once it is packaged as a consumer product its purposes expands beyond filtering to pass lows. It's supposed also to make a little profit for everyone in it's supply chain who might reasonably ask: Why?In my world I just call that a low pass filter.
The impedance of both the source and amp matters.Yeah this would be way more useful if it had the LP and HP pair and show how they sum up.
Sorry if this a stupid question but would the impedance of the amp affect the slope?
They still make these so no corrosion … People can get them new and they could get different rolloffs and frequencies if necessary.You will be incorrectly loading the first filter so won't be exactly 24dB/octave and the -3dB point will shift to a lower frequency.
You will also get more attenuation at 20kHz.
Wouldn't you use it hat line level between phono pre-amp and pre-amp?Tried a similar, but high pass filter from this company as a rumble filter for my turntable several months ago. Did not like how it impacted the higher frequencies and sent it back. Likely that the RC network didn’t play well with my cartridge and phono.
Yes, but the phono is part of an integrated amp.Wouldn't you use it hat line level between phono pre-amp and pre-amp?
While I appreciate the time spent on this review and the member sending them to you.This is a review and measurements of the HLabs in-line RCA 50 Hz crossover. It was kindly sent to me by a member and costs US $27.95.
After 10 seconds on that Geocities-quality eye cancer, I know I'd never give them a dime. Anyway...I thought these were 'the' Harrison PA guys from the UK, known for their amps and consoles but it's probably a one 'tin foil' hat man company:
Harrison Labs Crossovers - FMODS, PFMODS, FMOD CABLES, BASS BLOCKERS, Contract Manufacturing
Harrison Labs manufactures high quality electronic products. Hlabs provides contract manufactures for partner companies.www.hlabs.com
A filter changes frequency response which in turn changes measurement bandwidth/noise and harmonics. So while I could easily produce such a number, you would have no reference to compare it to.Agree, it would be nice to see THD and noise on this unit.