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Discussion Starter · #41 ·
Foxman,

You wiring setup is almost the same as my drawing (first post of this thread).

BEFORE you wire up 3 pairs, you might want to check a few things on your old 5.1 receiver.

1) Does it have a Stereo 2 channel mode?

2) Does it have a MONO 3 or 5 Channel Mode?

The reason I ask is...

I THINK most 5.1 receivers will not send the same signal to the Center as the LEFT and right by design. Thus a Stereo 2 channel or MONO 3 channel setup is what you really want.


Your math it right 4ohm + 4 = 8 per channel

But your output might not be equal on the center compared to the L&R.


IF you have to use only 2 channels just wire 2 pairs of 3 in series and get 12ohms per channel. Some one posted above this won't hurt the receiver just reduce the total output to each shaker.


However don't let that be a deterent! You probably won't have the shakers at full volume anyways!!! (Too high and your bum starts to get numb and a little annoyed...)


Good Luck!
 

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Bob knows what he is talking about.


One thing I would mention about crossover points. You could use two Harrison Labs PFMOD RCA in-line crossovers. Place them between your processor audio out and your multi-channel amp audio IN. These attenuators come in all frequencies, get the low pass one, I believe it is 70HZ. They are 12dB/octave, but you can stack them for a steep 24dB/octave slope. These will keep the voices from being vibrated from the Shakers.

 

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Discussion Starter · #43 ·
hometheaterguy,

How do you know which Hz version to buy if you're a crossover newbie who just want to crank up their shakers without feeling EVERYTHING?


Is it personal preference? Experience? Experimentation? Calculations based on your equipment and desired output?


How do "I" pick the right one for me simple inexpensive setup? (I wish I bought these with the shakers to save shipping
)
 

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Bob the crossover point in this application is chosen by what crossover points cut voices and frequencies above 200HZ. You are safe with anything 200HZ and below. It has been determined that sounds below that are "less" localized and therefore are mostly felt, not heard.


THX, standing for Thomas Holman's X-over is 80HZ. Sony uses a 100HZ cut-off in their decoders.


The 100HZ LP (Low Pass) PFMOD would never need replacing if you go with that one. Just make sure you get a low pass.


If you have a shop in your town that sells raw speaker drivers, they are sure to sell PFMODs. Any car audio shop will as well.
 

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Bob - thank you for the feedback - I will check the receiver to see if I can get equal output to each channel. I will let you know how it turns out.
 

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I have read of people using the FMOD 50 Hz low pass because they could still feel vibrations on things like doors slamming, etc. That doesn't sound all that realistic. I've never felt tremors in my couch when someone closes a door hard!


A lot of it is personal preference.


Dan
 

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Discussion Starter · #47 ·

Quote:
Originally posted by foxman
Bob - thank you for the feedback - I will check the receiver to see if I can get equal output to each channel. I will let you know how it turns out.

Glad I could help! I created the post/sketches to help newbies like me that might have an extra receiver and limited speaker wiring knowlegde.

----------------

I'm considering putting my old passive sub that came with the prologic reciever on the center channel just to see what happens. (In 3 speaker prologic? mode - It doesn't have a mono mode
only stereo, 3 speaker or 5 speaker prologic)


Unfortunatley I just put it under our tiny 4.5 foot tree to prop it up near the window.
 

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Discussion Starter · #48 ·
Does that mean the 70hz versions would be a nice comprise between THX and Sony? Use one or two? (Sold in pairs on parts express).
 

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Sorry, Bob, just got back to this thread. Well my Lexicon pre/pro has an adjustable (variable) crossover adjustment, I will be using the PFMODs for just the Shakers.


I would use the 100HZ PFMODS. You will get a little more mid-bass vibrations.
 

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Discussion Starter · #50 ·
hometheaterguy,

I will have to find/read my receiver's manual, but don't HT receivers with SUB out already cut most/some of the highs out and send the rest to the front speakers?

Or do they just cut them off around 200?


At the moment I'm probably not going to buy the FMODs (getting low on $$) and at the moment what I have works.
 

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Hi Bob, good seeing you.


Yes, a receiver with SUB, or LFE out will cut high pass frequencies. Yes, you will have to review your manual to find the exact crossover point as some manufactures have different crossover points. You are at liberty to use this connection. I did not know you had it available, I thought you were using a conventional sub with it.
 

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Great article Mike, thanks.
 

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Discussion Starter · #54 ·
OK I've got a question about my Sherwood Prologic Receiver (don't have model# handy), that is shown in my original sketch at the beginning of this thread.


I'm considering adding a 3rd pair of shakers. I'm considering adding the pair to my Center channel, and switching the receiver to 3channel "prologic" mode. Is this likely to work evenly per pair or will the center shake like mad?

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Reminder - Mono signal from 6.1 Receiver's Sub-Out - Split to powered sub and split again to L&R input of Prologic Receiver - 2 pairs of shakers - 1 pair in parallel to L and 1 pair to R out.

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Is the Center channel idea going to work or should I make 2 pairs of 3 shakers?

I'm currently out of wire so experimenting won't be easy unless I find some scraps.
 

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Ok, not to beat this to death, but my electrical engineering is pretty weak. I have 6 bass shakers and 2 rows of 3 seats. I will be using the Aura Bass Shaker Pro's (6 in total). I also just purchased the 250 watt plate amplifier mentioned from parts express. What is the best way to wire these up so that I can get the most out of my amp?


Is simply wiring 2 sets of 3 shakers in series my best option here?


Thanks.
 

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" 3channel "prologic" mode. Is this likely to work evenly per pair or will the center shake like mad?" (Bob)


I think you mean 3-channel stereo as Dolby Pro Logic is L, C, R, and mono surround (4-channel). In 3-stereo you will have equal power, but in DPL, yes the center will have more output regardless of the crossover point.
 

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Discussion Starter · #57 ·

Quote:
Originally posted by hometheaterguy
" 3channel "prologic" mode. Is this likely to work evenly per pair or will the center shake like mad?" (Bob)


I think you mean 3-channel stereo as Dolby Pro Logic is L, C, R, and mono surround (4-channel). In 3-stereo you will have equal power, but in DPL, yes the center will have more output regardless of the crossover point.

OK

Well at least on that receiver I can adjust the Rear and Center channels lower than the Main (L&R). So that should work for my "extra" chairs. Now I have to check if they can be installed.

-------------

Quote:
digitaltrader

Ok, not to beat this to death, but my electrical engineering is pretty weak. I have 6 bass shakers and 2 rows of 3 seats. I will be using the Aura Bass Shaker Pro's (6 in total). I also just purchased the 250 watt plate amplifier mentioned from parts express. What is the best way to wire these up so that I can get the most out of my amp?


Is simply wiring 2 sets of 3 shakers in series my best option here?

Is that a mono amp? How many out put connections does it have. (I'm not familar with them).

If they have 2 out puts make TWO pairs of Three

If they have 3 out puts make Three pairs of TWO (but that seems silly with 2 rows).

If they have only 1 out put, you have to check earlier parts of the thread. I didn't quite know how to do that. That's why I saved $$ and used my old receiver which came out of our bedroom.
 

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Sorry to bring this thread back up as it seems to have all the answers, but it can be quite confusing with every scenario each of us has.


Well here I go with my set up and how to properly connect my Aura 25 watt bass shakers.


First I have two rows of three Irwin Marquee theatre seats (each on its on riser - back row is 10" off the ground and the first row is 2.5" off floor)


I have an old 100w BIC subwoofer(SWA-100) amp (piece of [email protected] - hums way to loud - will replace after holidays). I am feeding this amp from a split RCA sub connection from my Harmon Kardon HK300 into a Paradigm PS1000 and then it splits (mono -rca connection) to this amp, I then split the mono rca connection to a stero rca connection and feed this into the BIC amp.


This amp has only 1 output (+/-) out for subwoofer, but does have Left and right channel outputs as well. I can also set the amp for 8 or 4 Ohms.


What is the best way to connect my 4 25watt Aura bass shakers? Also, this amp hums very loudly(well enough that I hear it in dialogue scenes) - is this normal or is it just because this amp is [email protected]?


thanks for the help.
 

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Discussion Starter · #59 ·
humming electronics does not sound very safe in the long run.

I'm not familar with sub amps but...

Try hooking up a pair of pararell shakers to each channel (left and right).

Other wise check the series formula above and try to come up with a setup that will give 4 or more ohms total and hook up to the sub output.

(sorry to busy at work to help beyond that).


BTW I think this post should keep growing rather than a new post every few days!
 

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"BTW I think this post should keep growing rather than a new post every few days!" (from Bob)


Don't worry, it will.
 
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