Yamaha CR-640 Low Filter Cutoff Frequency?

[Tusec]

Well, UPS dropped off my Yamaha CR-640 receiver today. Oh man what a beauty! I can't believe what a fine machine this thing is.

Anyway...

It's in minty condition and all the functions seem to work - except maybe the Low Filter switch. I push it and can't hear any change. However, my speakers are smallish bookshelf types -- Boston Acoustics CR-7's -- which makes me think maybe the rolloff happens below their lowest frequency. In other words it's working but isn't audible.

Does anyone know what the cutoff frequency is?

 

[ryuuoh]

Low cut was from the turntable days, to cut some rumble and super low freq energy. I'm guessing your low cut is around 30 hz.

 

[avionic]

Low cut was from the turntable days, to cut some rumble and super low freq energy. I'm guessing your low cut is around 300 hz.

Gives a "sharp " 12 db/octave cutoff below 25 Hz... Doubt if you can hear it.

 

[Tusec]

Yeah, if it's 25hz, then I'm probably not hearing it. Low freq on these speakers is stated as 80Hz. If it's a 6dB slope below that, then they'd be almost 18dB down at 25Hz -- and that's just when the Lo filter is starting to kick in.

 

[PacificStereo]

I would have to go look the 640 up, but my guess is that Avionic has it right.

 

[merrylander]

The low filters on most yammies were there to take care of both TT rumble and record warp.

 

[AnalogDigit]

The low filter on the CR-640 is used for subsonic frequencies. All the receivers I own act the same way. I hope you enjoy your CR-640.

 

[avionic]

I would have to go look the 640 up, but my guess is that Avionic has it right.

I quoted the owners manual...
http://audiokarma.org/forums/showpost.php?p=1725272&postcount=1