matthew2 Posted July 13, 2001 Share Posted July 13, 2001 Im wondering if someone could answer me a question. I was looking at Technics recievers, and the specs were intresting. It stated the freq' responce was " 40HZ - 20KHZ " 40 HZ isnt very low. Im hoping I dont understand something for technics sake. Im no audiofile, but once a guy told me every amp had to go to 20HZ. Is the 40HZ thing just the frequency range they used to measure the THD?? ------------------ Matthew Quote Link to comment Share on other sites More sharing options...
Ray Garrison Posted July 13, 2001 Share Posted July 13, 2001 That's odd. I've never seen anything that was positioned as a decent stereo amp, receiver or whatever that had a spec that didn't go below 40Hz. What model number was this? ------------------ Music is art Audio is engineering Quote Link to comment Share on other sites More sharing options...
jdm56 Posted July 13, 2001 Share Posted July 13, 2001 matthew2 I have seen advertised specs on a very few low, low, low dollar receievers that only rated power down to 40hz. I've seen a number of inexpensive multi-channel receivers that only quoted power figures at 1000hz, too. It takes more current to drive speakers at low frequencies, and the smaller power supplies of cheap electronics can't deliver. ------------------ JDMcCall Quote Link to comment Share on other sites More sharing options...
Kevin S Posted July 13, 2001 Share Posted July 13, 2001 Many less expensive receivers and some tube amps (such as Conrad Johnson, I believe) quote power spec's using a low end frequency cutoff higher than 20hz. I suspect that their power and/or distortion levels deteriorate quite rapidly below their cutoff point, so they raise the point to where the specs are better. I personally would not consider one of those receivers except for spare room/background music listening Quote Link to comment Share on other sites More sharing options...
discorules Posted July 13, 2001 Share Posted July 13, 2001 quote: Originally posted by James D McCall: matthew2 I have seen advertised specs on a very few low, low, low dollar receievers that only rated power down to 40hz. I've seen a number of inexpensive multi-channel receivers that only quoted power figures at 1000hz, too. It takes more current to drive speakers at low frequencies, and the smaller power supplies of cheap electronics can't deliver. I think you hit the nail on the head James. To reach the broad maket at an affordable point, some HT receiver manufacturers will trade off power to meet this requirement. Quote Link to comment Share on other sites More sharing options...
Gnomore Posted July 13, 2001 Share Posted July 13, 2001 I was reading on Yamaha's website one time and was comparing a receiver from the HTR line and the RX line that were basically the same receivers for different distribution chains. The HTR line rated power at 1000 HZ while the RX line rated it from 20-20K Hz. They say on their website that the amps are identical but they are rated this way because the standard for rating power in specialty shops was 20-20k Hz and the standard for mass retail was to show power at 1000 Hz. This message has been edited by Gnomore on 07-13-2001 at 02:39 PM Quote Link to comment Share on other sites More sharing options...
mpgwagon Posted July 14, 2001 Share Posted July 14, 2001 The ratings on my Technics SA-GX530, SA-5370, SA-404, and SA-DX1040 are all rated @ 20HZ - 20,000 HZ. ------------------ Technics SA-1040DX Klipsch SF1 Fronts Klipsch KSW12 Sub. (2) Klipsch SC1 Center Klipsch SF1 Rears Panasonic RV31 DVD Quote Link to comment Share on other sites More sharing options...
USparc Posted July 15, 2001 Share Posted July 15, 2001 The onkyo's have WRAT. (Wide Range Amplifier Technology) They start from 20 Hz and go up to 100kHz !! But these are cut off frequenties, so they go beyond that. It is nice to be far from these cut off frequencies so that distortion in the operation area is almost absent. Like Kevin Said: "Many less expensive receivers and some tube amps quote power spec's using a low end frequency cutoff higher than 20hz. I suspect that their power and/or distortion levels deteriorate quite rapidly below their cutoff point, so they raise the point to where the specs are better." They give just the range of flat response. ------------------ ------------------------- Receiver: Onkyo 676 DVD: Pioneer DV-525 Screen: Thomson 46" RetroProjection Front: RF-3's Rear: RF-3's Center: RC-3 Quote Link to comment Share on other sites More sharing options...
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