Axiom Home Page Forums General Discussion Home Theater Thinking of an upgrade... Need a little help

Josh, have you checked the screws holding the driver in place behind the grill cover to make sure they are not loose?

Can you turn off the auto-EQ and run it for a while ? I'm a bit fuzzy on exactly what the 635 will do (I have a 630) but I think it does room EQ as well as level setting. If so, sometimes the EQ pumps up certain bass frequencies to give you a flatter response but makes your sub work much harder (ie hit its limits sooner) as a result.

I should probably interject here -- I have a big-ass SVS sub, purchased before the 500/600 came out, and can easily make it rattle and groan if I'm not very careful with the volume control, so if you have a large room and are playing at any kind of high SPL you probably are just overdriving the sub. Everything we're suggesting is just to make sure that you are getting all the enjoyment out of the sub that you can.

Going with a bigger sub brings lots of enjoyment as well, and the difference between 350 and 500 is pretty significant. One of the nice differences about the 500 is that the DSP acts as a very smart limiter, so even if you overdrive it a bit the DSP will gracefully back down the volume for a moment rather than overdrive the woofer.

I like my idea best.

Upgrade to the EP500 and spend your time getting that to work as well as you can.

Josh:

Here's something else to try out. On your HK receiver, set the sub output to +12db and the sub volume at the 9 o'clock setting. See if that takes care of the rattle. You might get too much bass, but since you like low frequency sounds, that shouldn't be a problem!

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The reciever is controlling the crossover as I have the sub's knob turned all the way clockwise. What should the reciever crossover setting be for the sub?

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I'm curious about this also, as the question has come up often. HK owners why would there be a crossover level setting on the receiver for the sub? Isn't the point to set a crossover for the various speakers to direct lfe to the sub, why would you have a setting for the sub to send lfe to itself?

Hey Randy,

Not sure about the HK config availability, but on my Anthem AVM20 I have a multitude of frequency setting I can use for my sub (s). Anywhere from 45hz to 120hz in 10hz increments (or something really close to that:-). I have it set at 80hz for HT and sometimes I bring it down to 65hz for music. I can have 2 seperate and distinct settings for all speaker crossovers, one for cinema and one for music.

I am also a bass nut but my room size is not as large as some and I rarely overdrive my sub to the point of rattling. I would hazzard a guess, like it was sugested, that perhaps the sub is in a bass null and positioning should be explored for sure.

Steph

>>I'm curious about this also, as the question has come up often. HK owners why would there be a crossover level setting on the receiver for the sub? Isn't the point to set a crossover for the various speakers to direct lfe to the sub, why would you have a setting for the sub to send lfe to itself?

This is one of the few confusing things in the HK "manual of arms". As you suggest, the crossover frequency settings are for the mains, center, surrounds and rear surrounds so you can say "above this go to speaker, below this go to sub".

In addition, however, you can set a low-pass filter on the .1 LFE channel, so that anything above this freq is discarded while anything below this freq goes to the sub. I don't fully understand the rationale for having this filter but it is there. Even more confusing, the LFE cutoff is not set in hz but by picking one of the other speaker sets then the LFE cutoff is set to be the same frequency as the one picked for that speaker.

Just a guess, but I think this is what people are talking about.