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Marantz SR 5200 with High Level input Sub. Safe?


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Hi,

 

I'm currently connecting the Marantz SR5200 sub pre-out to the line-level Mirage Frx-S8 Sub input.

 

However, when I switch to "source direct", the receiver

bypasses the tone and bass management, and thus

no signal to the sub.

 

My main speakers cannot produce frequency below 90Hz. Though sounds better with "source direct",

it lacks the low frequencies. :(

 

Is it electrically OK to run another pair of cables from

the receiver's left and right amplified channel

into the sub's "High - Level" input and then

tweak the crossover and level on the Sub?

 

The left and right amplified output will now

power the speakers AND the sub.

 

thanks.

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I'm not sure whether it could be done with your Mirage subwoofer (it's best to consult Mirage) but I just read CNET review on PSB Alpha Subzero and there is a line related to your question:

"PSB recommends, where possible, hooking up both the line-level and the speaker-level connections on the SubZero. That way, if your receiver's bass management turns off its sub output when you play CDs, as many do, the SubZero will still receive the signal. "

(http://electronics.cnet.com/electronics/0-6342413-1332-6898551.html)

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In this way, we will go back to square one whereby you got to tune the sub again to suit the music/speaker in Soure direct mode.

 

thanks for the responses.

 

Boh pien...either that or no bass in source direct.

Ideally, use the sub-out for movie and source direct

for music. greedy.

 

Do you know if it's electrically ok to connect the receiver

to the sub in parallel with the main speakers?

I'm not sure of the sub's load (impendence).

 

The sub has high level input but no output.

 

Will take shcheah's advice to check with Mirage and Marantz. Not sure if I'll get a response.

Their manuals are quite brief. especially for a newbie

like me. :)

 

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In source direct mode, sub-woofer is not supposed to be in use anyway. That is true "source direct"

 

If u want the sub-woofer to play in 2-channel mode, then there is a few alternatives.

 

1) Change your mindset. Source direct sends 2-ch stereo audio to the sole 2 channels, left & right. Subs are not meant to be used in source direct mode.

 

2) Set up bass management to include subwoofer in 2-channel stereo. I'm sure bass management setting can be adjusted to allow sub when playing 2-channel stereo.

 

3) Set-up your mains to be "small" (There should be a similar adjustment of this sort... its standard feature in most of todays AV amps). Don't be greedy and try to run small mains as large. You'll only do more damage to amp and speakers!

 

4) Run speaker level output to sub-woofer and daisy chain to small mains; as suggested in the manual. Some might suggest connect speaker A to speakers and B to subwoofer. This would allow turning ON/OFF subs by the push of a button.

 

5) I suggest exercising caution when trying to connect both line level and spkr-level at the same time. Some subs can take it, some subs can't. The result can be as trivial as weird bass or as bad as damaging the sub, speakers and amp. Try it at your own discretion.

 

Personally, I suggest 2 & 3 since they logically define your system setup in the first place.

 

BTW, your bass appetite is more towards heavy thumping bass or tight and fast bass?

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Thanks Jag for the detailed response!

 

The bass management is disabled in "source direct".

i.e. The receiver assumes "Large" speaker with No sub in source direct. ( even If I set it to small! ).

It works ok in regular "stereo" mode, but not "source

direct".

 

Seems only two options for me.

1. Parallel connect speaker level left/right to sub.

Can't daisy chain, coz sub has no output.

I will not connect both line & speaker level at

the same time.

 

2. Get a full range main speakers for source direct.

8) and forget about the sub.

 

p.s. the speaker has build in circuit protection against

low frequency. ( should be some kind of high-pass filter).

 

btw, for music, I prefer tight and controlled bass as oppose to powerful ones.

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hmm i tot SR5200 can pre-out the L&R channel? Does that solve your problem? ;D

 

Thanks deepblue,

 

It does, but only if

 

1. The Sub takes in line-level left and right channel.

Mine only takes in a mono line-level signal, or a

stereo speaker-level signal.

 

Previously, I've tried using only the left channel,

but the result is not so satisfactory. Do you know

of any simple device that can combine both left

and right line level signal into a single mono signal?

 

2. No significant lag between the pre-out and the

speaker-level out. Else, the bass will either be

too early or too late.

 

3. No coloration in the amplifier module. Else the

sub may sounds a bit "different". I'm too inexperience

to test this tho/ 8(

 

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Hi Fourier,

 

1) I believe you are looking for a Y-RCA connector, I think it was previously discussed in this forum you can try to search for it. It is quite easy to get 1 in SLT/SLS.

 

2) Guess Pre-out not designed for bass, if your woofer can has got the "phase out" function it may be useful.

 

3) hmm...no idea.. ::)

 

;D ;D ;D

 

hmm i tot SR5200 can pre-out the L&R channel? Does that solve your problem? ;D

 

Thanks deepblue,

 

It does, but only if

 

1. The Sub takes in line-level left and right channel.

Mine only takes in a mono line-level signal, or a

stereo speaker-level signal.

 

Previously, I've tried using only the left channel,

but the result is not so satisfactory. Do you know

of any simple device that can combine both left

and right line level signal into a single mono signal?

 

2. No significant lag between the pre-out and the

speaker-level out. Else, the bass will either be

too early or too late.

 

3. No coloration in the amplifier module. Else the

sub may sounds a bit "different". I'm too inexperience

to test this tho/ 8(

 

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Don't get a full range. No use. Marantz SR5200 is only like that. It may be 2 cause, either the amp is over-rated, or It is design for more clarity then bass in its sound direct Circuit. Or maybe the room is too big in my case i think

 

I've got the same amp. Cheap Roger Bookshelve, same bass problem, Bought a wharfedale Diamond 8.4, bass improve a little and goes louder a bit. Thats all.

 

Now in my living room, i've the 5*Rogers + wharfedale PC12A Sub for Home theater using the Marantz SR5200 and In my computer bed/room, i setup the Diamond 8.4 with old yamaha pro-logic amp. Thumping bass in that room. Now looking to upgrade amp and cd player. Then cure some boomy situations.

 

My friend, the diamond 8.4 shake the floor in my room !

 

Thanks Jag for the detailed response!

 

2. Get a full range main speakers for source direct.

8) and forget about the sub.

 

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Hi Fourier,

 

1) I believe you are looking for a Y-RCA connector, I think it was previously discussed in this forum you can try to search for it. It is quite easy to get 1 in SLT/SLS.

 

<stuffs deleted>

 

Deepblue,

Thanks for your suggestions,

 

I would not recommend a normal Y-RCA connector designed for signal splitting.

 

I suspected that such a connector may be not be

electrically ok coz' most of them are built to split a signal

into two and not combining two signal into one.

 

You have inspired me to search for a low-cost electrically sound DIY signal mixer. Here's the result.

 

http://www.hut.fi/Misc/Electronics/circuits/linesum.html

 

Hope it's beneficial for anyone who is using a Y-RCA right now.

 

p.s. I could not find the previous discussion on Y-RCA connectors.

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