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Topic:
Subwoofer question
This thread has 5 replies. Displaying all posts.
Post 1 made on Friday December 31, 1999 at 13:53
Mitch S.
Historic Forum Post
Hi there,

I the Marantz SR-7000 receiverand so far am very happy with itI have a few questions with bass mangement.


I have large mains and small center and surrounds, and have set the receiver up as such. In this setup, however if i listen to a cd in the auto mode the stereo signal doesn't goto my sub unless i select small for my main speakers. It does if I set the surround mode directly to stereo, and not auto. So my dilemma becomes which way to set my main speakers to most simlify the receiver setup for the whole family to use. The answer would be set mains to small and use auto mode. However, in doing so I think all signal below 100 Hz goes to my sub. I am not sure if adjusting my sub's low pass filter to..say 80 hz has any impact on what goes to my mains in small mode, but i think it does in large mode.

Sounds confusing, but I just don't know if there is a way around the 100 HZ crossover of the subpreout when my speakers are set to small I feel the midrange suffers a bit in this mode with the bass diverted to my sub.

Could I run my main outs from the reciver into my sub, then from my subs speaker outs to my main speakers and then just set the subs crossover to whatever value i want?

How will such a setup affect dolby digital LFE etc?

Thanks in advance for any help,

Mitch
OP | Post 2 made on Friday December 31, 1999 at 16:08
Bill Lucas
Historic Forum Post
Mitch,

The crossover point for Marantz equipment is 80hz, not 100hz. What is the frequency response of your "large" main speakers. Just because they are large doesn't mean they have great bass extension. The midrange should not suffer at all when the bass is going to the subwoofer. The opposite should be true. Your main speakers won't have to strain to reproduce low bass and the midrange should clear. Yes, you can hook up via speaker level outputs but I wouldn't suggest this fashion. Unless your main speaker go EXTREMELY low, loud and strong I'd set the mains as small for all media.

Good Luck,

Bill Lucas
OP | Post 3 made on Friday December 31, 1999 at 19:57
n-vision
Historic Forum Post
Bill offers some good advice.

Most larger home speakers do not have efficient bass extension below 100hz. They don't provide the deep bass that your sub is designed for. Cutting out these frequencies by using the 'small' setting may even make your system sound better! (provided you have a good sub)

Derek
OP | Post 4 made on Friday December 31, 1999 at 20:23
cooltoff
Historic Forum Post
Hi Mitch,

Firstly, does this receiver have a 5 channel stereo mode? It sounds like the auto function is switching to standard 2 chan. stereo, but manually your switching to the 5 chan. mode.

Secondly,I'm not sure I quite understand your dilemma.For your original settings,( Large mains, small- all the rest ) your receiver is working as it should for stereo listening.Only sub 80Hz bass from the center and surrounds plus any LFE info will be routed to the subwoofer.

Now, if you want your sub working full time then, as Bill stated above, set all your speakers as small.

As far as controlling the Xover point of the sub preout, you can't. The Xover is controlled by the receiver, set at 80Hz. If you want more control over the Xover point you could put another sub inline with your mains with the receiver set to large mains. Then the Xover adjustments on the sub itself will be controlling the Xover frequency.

How will this affect the LFE? The LFE info as well as the sub 80 Hz info of the other 5 channels will be routed to the "large" mains with the inline sub.

Hope I clarified things somewhat.

Happy 2000,

Paul
OP | Post 5 made on Friday December 31, 1999 at 22:08
Mitch S.
Historic Forum Post
Thanks for the responses, but I called Marantz, and they said that the reciever crossover is set at 100 Hz which is the Dolby standard. My Mains Are energy C6 models with base response rated down to 30 Hz though I'm sure the effective bass isn't that low.
I think when things are set to small for my mains, all bass below 100 Hz goes to the Sub, and the lower midrange I think suffers a bit as a sub is less tight than the main's bass.

As for my setup I am referring only to 2 channel stereo mode though I can and do use 5 ch. stereo too. The Marantz has an auto setting for surround. If in this mode and a 2 channel signal is sensed it will send music only to the mains and not the sub( when set to large). When set to small, it sends to both sub and mains but then I must deal with a crossover of 100 Hz which to me seems a tad high. I prefer about 70 Hz with my system. If I put my surround mode directly to 2 ch. stereo, output goes to the sub as well, regardless of the large or small setting, providing my sub is set to on. The help I am looking for is how to get the crossover to 70 Hz while still being able to use the auto mode. I don't think I can using simple preout from the receiver. Anyone know how I might?

By the way I also have a mode of source direct which bypasses all tone control and bass management and sounds really pure through my mains which beats auto mode, if i dont want to use my sub.

Thanls and Happy Millennium to all!
OP | Post 6 made on Friday December 31, 1999 at 23:09
cooltoff
Historic Forum Post
Like you said up top. Set the mains to large and put the sub ahead of them.

Main out > sub > Mains.

Set the Xover at the sub, provided the sub's Xover can be set at 70 Hz.

Gotta go bang pots now,ciao


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