mission m-cube

[keiser1]

Hello all,

A while ago i purchased a set of mission m-cubes,while i audtioned them i noticed the retailer hadn't used the supplied 'umbilicle' cord used to connect the sub to the amp,it was just connected the normal way with a sub lead and the 5 cubes straight into the amp,i asked if this would make any difference to the sound and was told it wouldn't. I've since been using the package this way but have upgraded all speaker cable and plugs and to me it sounds excellent. I'm now a little worried that this may cause damage to either the sub or cubes. Any suggestions or advice would be gratefully recieved.

keiser.

panasonic th37px70b,denon avr 1909,ps3,sky hd,qed quinex p hdmi,qed silver anniversary xt,qed quinex reference sub

 

[Messiah]

If it sounds excellent why are you worried?? It should be fine. Cannot see why it would be damaged!!

Enjoy your system!

 

[keiser1]

I checked the mission FAQ's on there web site and it says that the umbilicle acts as a buffer to protect the cubes if the system is overdriven? It also states that it is needed to reproduce all the frequencies on all the channels??

 

[keiser1]

Has anyone come across problems on the same package or one similar?

 

[Messiah]

The Mission site does state:

Why do my m-cube speakers have to be connected to the active subwoofer rather than the amplifier?

The
M-cube active subwoofer acts in 3 different ways. Firstly, it acts as
an amplifying device for all those low frequency effects (LFE) that you
feel rather than hear and does this via an RCA phono lead. Secondly, by
means of the umbilical cable, it amplifies all the channel specific
information that the m-cube satellite speakers cannot reproduce simply
because of their small size. Finally, it acts as a buffer, not a
filter, between your amplifier and the satellite speakers to reduce the
risk of damage in the event of the system being over-driven. If you
really must connect the m-cube satellite speakers to the amplifier
terminals because of your room configuration, you would effectively
remove that degree of overload protection. In addition, you would still
need to have the umbilical cable connection between the amplifier and
the subwoofer, simply to reproduce all the frequencies on all the
channels

But it also states:

Can I use my own cables to connect my Mission AV satellite speakers?

Yes
is the simple answer although you will need to purchase a plug adapter
which has a moulded 2-way terminal block at one end and a polarised
connector for plugging into your satellite or subwoofer at the other.
These can be obtained from your local Mission dealer

Do you have the speakers wired to the Sub or the Amp???

 

[keiser1]

i have the speakers connected straight into the amp

 

[Messiah]

Is it possible to connect them straight to the Sub??

 

[keiser1]

yes, it says in the cubes manual that you should connect the umbilicle to the 5 channels on the amp, then connect the umbilicle to the sub, then after that connect the satelites to the speaker outputs on the sub.

 

[Messiah]

Sorry I wasn't clear there. I know you can do this but what I mean is do you have the ability to do this or are they now wired in such a way in that they need to be connected to the amp.

Can you change them over so instead of being connected to the the Amp they are connected to the Sub??

 

[keiser1]

i can do it this way,there would be alot of adjusting but it can be done

 

[Messiah]

Well maybe you should give it a go. At least you will have peace of mind that it is connected as recommended!

Hopefully it will sound as good this way too.

 

[keiser1]

I'll give it a whirl,run the auto set up again and see what the results are, you never know it may even sound better!!

thanks for your time messiah, i'll post again after the adjustments

 

[Messiah]

Your welcome. Look forward to it!!

 

[kinda]

Hello,

I think that the way you have the speakers set up should be able to work without damaging anything, and getting good sound.

Usually with sub / sat the amplifier decides what goes to the subwoofer, and what goes to the satellites, so everything below a certain frequency goes to the sub.

What the Mission setup seems to be indicating is that the speaker output goes to the sub first, and (presumably alterable by some settings on the sub), the sub takes some of those lower frequencies itself and passes the rest to the speakers. This just seems the same result by a different method, but with the added overload buffering, (which most setups seem to do without).

I think as long as you ensure that the frequencies getting sent to the speakers are not too low for them, (by setting a correct crossover in the amp), then you should be fine.

You'd probably have to do this if you added a 6 or 7th speaker as well, as I think the umbilical is only for 5 speakers?

It seems fine to me, but it might be worth checking with your dealer or maybe Mission direct?

 

[keiser1]

hello,



i've checked the crossover frequencies after running the auto set up and the amp is saying 250hz for the sats and 80hz for the sub, would you recommend this to be a safe setting?

also i've just checked the umbilicle and its set up for a sixth speaker

 

[Messiah]

keiser1:
i've checked the crossover frequencies after running the auto set up and the amp is saying 250hz for the sats and 80hz for the sub, would you recommend this to be a safe setting?



Hmmm, surely there should be only one cross over frequency, that between the sats and the sub. Why are there two readings?? (Apologies if I am missing something obvious here!)

 

[keiser1]

i,ve gone into speaker set up then to crossover freq on the amp and this is what the display its saying;front,small 250 hz

;centre,small 250hz

;surround,small 250hz

;s.back none

;lfe 80hz

i think i should be the one to apologise here because i have i'm getting really confused!???

 

[kinda]

Hello,

The readings do seem confusing. I think some amplifiers have a crossover for each speaker, instead of just a single one. Still don't get why the sub would have a crossover setting in the amp. What amplifier have you got?

I would have thought that when using the umbilical chord you would set all the speakers to large, so that they get the full frequency range, and would have expected the amp to detect them as such with the umbilical connected, as the subwoofer would bolster the base for each one. With the subwoofer supposedly getting the speaker output first so that it can reproduce the lower sounds and pass the rest on, I can't see why the amp would need to be filtering out the lower frequencies first.

In terms of safe settings for a conventional setup, (i.e with amp connected direct to speakers), then you just need to be sure that the surround speakers aren't getting anything that is too low for them to reproduce, (an amp's autosetup should sort this out).

If you have the specs of what frequencies the speakers support, you could double-check it.

Hope this helps a bit and that you are getting somewhere.

 

[keiser1]

Hello Kinda,

I've got a denon avr 1909,connected all the speakers then run the auto set up.

Before i had this amp i had the denon ar 1508 and i got exactly the same read out as the 1909 so i had presumed that the amp is setting correctly.

I've checked the cube manual and the spec says; frequency response (-6db): 280hz-30khz? is this ok?

Also like you said the manual suggests setting the cubes to large but my amp is setting to small......

 

[Anonymous]

First post here so hope it it OK to post my variation of question.

Current set-up is as per manual. Umbilical cable to sub and satellites wired to back of sub.

Want to move setup to another room. Umbilical cable will be too short and it would be difficult to pull on account of the big connector at sub end. Some of my speaker cables are already home run to AV receiver in another room.

I deally I would like to connect sub with new sub cable and have speakers connected directly at AV receiver. Can you advise ?

Many thanks

Joe