AVS Forum banner
  • Take part in a short activity and share your valuable opinion on new design concepts for AVSForum! >>> Click Here
  • Our native mobile app has a new name: Fora Communities. Learn more.

Receiver with EQ of variable frequencies and bandwidth

896 Views 5 Replies 3 Participants Last post by  hifisponge

As the title suggests, I am looking for a receiver with parametric EQ, whose center frequencies are variable (NOT ISO like 32, 63, 120 ...), bandwidth variable too.

1 - 6 of 6 Posts
There are none that allow the user to set the center frequency and width. All of them on the market currently give you a multi-band graphic EQ. The only ones that come close are the Denons and the Yamahas. The auto EQ on both of these will set the filters to specific frequencies based on a mic reading of the room, but the user-adjustable EQ on both of these is just a graphic EQ with set bands.
Do you know if the Yamahas will auto EQ down to 30Hz on each channel individually?
If you are looking for the bass frequencies the B&K 507 II gives you three notch filters. They are pretty much the same as parametric EQ without the ability to boost. Some of the Yamahas have some ability but the center frequency has to be 1/3 octave increments and the width can be 1/7 octave or larger of course. For bass frequencies you should have a minimum of 1/12 octave capability with 1/24 octave preferred for both parameters, but it is still better than most. The Denons' are mostly graphic EQ.

I'd consider a good sub EQ and not try to EQ every channel for bass frequencies. In small room acoustics you should crossover the bass to the sub for a number of reasons.

Trying to EQ full range speakers down low will not give you a smooth response as the response will be different depending on which speakers are producing the sound. When two or more speakers are producing the frequency of your room modes you will get a different response than one equalized speaker due to cancellations or boosting of the mode frequencies.

Example, Say you have a room mode at 40hz. If you play 40hz material through the equalized left speaker the output is nornal. If you play 40hz material through the equalized right speaker the output is nornal. You play 40hz material through both equalized speakers your output is now 15db less due to canellation of the room mode as both the waves "crash" into each other. Now, try to predict your response calculating all your room modes for all the combinations of speaker 5,6, or 7 plus sub(s) and you'll quickly realize why the 5.1 (6.1, 7.1) system was developed. Some combinations might cancel a room mode, others might boost it and make the bass boomy or it could do nothing at all but very unlikely!

Hope this helps.

See less See more

Originally Posted by swwg /forum/post/0

Do you know if the Yamahas will auto EQ down to 30Hz on each channel individually?

"The Yamaha YPAO EQ system still does not EQ below 62.5Hz."


The Audyssey EQ Denon does EQ the bass down to 20Hz on all channels, but some users have complained about overcorrection and loss of bass impact with Audyssey. Then again, some of those that did experience an over-reduction in bass were able to compensate by increasing the subwoofer level a few dB. You'll just have to try it to find out if Audyssey works for you. Just buy from a dealer that has a 30 day return policy.

Originally Posted by BobL /forum/post/0

The Denons' are mostly graphic EQ.


Bob offers some very sound advice, but I would like clarify that the auto-eq in the Denon is hundreds of times more sophisticated than the user adjustable eq, which is as Bob points out only a simple, fixed-band eq. That doesn't mean that you will like what Audyssey does to the sound, but tests have shown that it is more effective at correcting the in-room frequency response than most auto-eqs.



See less See more
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.