NAD T775HD's Audyssey MultiEQ XT sets my Klipsch RF-5 crossover to 180Hz. What's wrong? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 03-22-2013, 05:11 PM - Thread Starter
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I am a frequent poster to the dedicated NAD T775/T785 thread, but I decided to create a new one since this is not specifically a NAD receiver issue but could be a general Audyssey or a speaker issue.

My HT consists of

NAD T775HD receiver with the latest firmware. It has Audyssey MultiEQ XT with 8 position support.
Speakers: Klipsch RF-5 floor standers for the mains (these are advertised as 37Hz-20k Hz). Klipsch RC-7 Center. Klipsch RS-35 surrounds, and Insignia bookshelves for the surround backs. Also have a bottom firing Elemental Designs A300 for Sub.

When I run Audyssey on my NAD, it reports the crossover freq for the mains as 180Hz, 50Hz for the center, 60Hz for the surrounds and 60Hz for the rears. The mains are supposed to be the most capable of my speakers. What's wrong. Is the Audyssey software not hearing it properly or could my speakers be going bad. They are from 2004. Can a bad crossover do this? Could my room geometry do this. I have tried moving my speakers around a little bit, but the best crossover I came across was 140Hz. I wish I had another receiver with Audyssey I could run with to see if it is a receiver issue or a speaker issue. The funny thing is, I took my Insignia and wired them up as mains, and the NAD reported 60Hz for it. So it cannot be entirely NAD's fault. Weird.

Any ideas?
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post #2 of 4 Old 03-23-2013, 06:36 PM
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Quote:
Originally Posted by bommai View Post

When I run Audyssey on my NAD, it reports the crossover freq for the mains as 180Hz, 50Hz for the center, 60Hz for the surrounds and 60Hz for the rears. The mains are supposed to be the most capable of my speakers. What's wrong. Is the Audyssey software not hearing it properly or could my speakers be going bad. They are from 2004. Can a bad crossover do this?

First make sure that your RF-5s are wired with the same polarity. If they are not, then there's your problem. If they are, then set them to "Large" and try listening to them one at a time (disconnect the other) from the main viewing position, playing familiar material that has decent bass content. Do they each sound nice and full to you, or does one of them seriously lack bass output?
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Could my room geometry do this. I have tried moving my speakers around a little bit, but the best crossover I came across was 140Hz.

The room and placement can indeed create nulls, but this case still seems rather extreme. Are your RF-5s by chance about 2' away from a wall? This could create a null around 140 Hz, which is why I'm asking. If they are, then try moving them closer to the wall, like maybe 1' away.
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Originally Posted by bommai View Post

I wish I had another receiver with Audyssey I could run with to see if it is a receiver issue or a speaker issue. The funny thing is, I took my Insignia and wired them up as mains, and the NAD reported 60Hz for it. So it cannot be entirely NAD's fault. Weird.

Did you place the Insignias where the RF-5s normally are?
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post #3 of 4 Old 03-24-2013, 10:44 PM - Thread Starter
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Thank you very much for your suggestions. I had already verified that the speakers were wired properly. However, when I was moving them around I was not taking them closer to the side walls. Based on your advice, I moved them to be about 12-14 inches from the side walls, and reran Audyssey and voila, it reported 70Hz. Way better than 140-180 I was getting before. Looks like Audyssey was erroneously looking at a null at 140Hz and thinking that it was the lowest my speaker could go!

Also, would a better crossover still help in my situation?
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post #4 of 4 Old 03-25-2013, 08:38 AM
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Quote:
Originally Posted by bommai View Post

Thank you very much for your suggestions. I had already verified that the speakers were wired properly. However, when I was moving them around I was not taking them closer to the side walls. Based on your advice, I moved them to be about 12-14 inches from the side walls, and reran Audyssey and voila, it reported 70Hz. Way better than 140-180 I was getting before. Looks like Audyssey was erroneously looking at a null at 140Hz and thinking that it was the lowest my speaker could go!

That's great! I love when plugging a few numbers real quick into a calculator translates so directly to real life (doesn't always happen). smile.gif
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Originally Posted by bommai View Post

Also, would a better crossover still help in my situation?

I'm not sure what you mean. It seems that there is another null around 70 Hz from another wall, presumably the wall behind the speakers, so you could try moving them a little farther from that wall to get the null down to a lower frequency, set your crossover to a higher frequency than the null, and then experiment with the placement of your subwoofer to help it fill in the null (while you can't fill in a null using the same speakers involved, even with Audyssey, you can use a different speaker, namely the subwoofer, to do that). Audyssey should help even out the overall bass response at this point, as usual.

By the way, with your speakers fairly close to the side walls, you'll probably want to toe them in some if you haven't done so already.
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