AVS Forum banner

1 - 20 of 2917 Posts

·
Registered
Joined
·
778 Posts
Discussion Starter #1
Since I'm not very speaker or amplifier savy I thought I post my quick/easy/cheap/basic way in which I hooked up my 4 bass shakers to 3 chairs using a old prologic receiver that needs 8 ohms per channel.


Note: I zip tied the shakers to the seat springs under my Berkline 099 HT recliners. The overall effect is not a strong on some scenes as expected, but my old receiver is not very powerful. And some movies don't have as much "LFE" as I thought.


2 Pictures to be uploaded.

I have an idea for hooking up 3 pairs on 2 receiver channels as well. If any one needs/wants that let me know I can draw that up as well.
 

·
Registered
Joined
·
778 Posts
Discussion Starter #2
Practical speakers in SERIES wiring.

Good idea for moving/removing a chair from a room for some reason, or if you don't want to run wires from one chair to the next based on spacing.
 

·
Registered
Joined
·
435 Posts
Hi Bob,

We have a dorm/theatre that has (10) seats, and we were given (10) 25 watt Bass Shakers. We want to hook them up to an amp with (5) going to "A" speakers on the amp and (5) to "B" speakers on the amp. Or (5) to the left channel and (5) to the right.

Our question is how many watts do you think it'll take to drive these puppies and exactly how do you wire these up? We've heard from ppl stating to run these in series, some said parrallel, some said you have to wire them + to - to + due to the ohm loads.

But not one of them (schematics) agreed with the other,,,,,,,,,,,,



Please help us Bob, its an all girl dorm and we'll do anything



Jessica



P.S. 1st row (3) chairs

2nd row (3) chairs

3rd row (4) chairs

(10) total
 

·
Registered
Joined
·
778 Posts
Discussion Starter #4

Quote:
Originally posted by CineFreak
Hi Bob,

We have a dorm/theatre that has (10) seats, and we were given (10) 25 watt Bass Shakers. We want to hook them up to an amp with (5) going to "A" speakers on the amp and (5) to "B" speakers on the amp. Or (5) to the left channel and (5) to the right.

Our question is how many watts do you think it'll take to drive these puppies and exactly how do you wire these up? We've heard from ppl stating to run these in series, some said parrallel, some said you have to wire them + to - to + due to the ohm loads.

But not one of them (schematics) agreed with the other,,,,,,,,,,,,



Please help us Bob, its an all girl dorm and we'll do anything



Jessica



P.S. 1st row (3) chairs

2nd row (4) chairs

3rd row (4) chairs

(10) total

Jessica,


I've seen some of your other posts and I was also confused by the diagrams you were given...


I'm NOT an expert but I have had an electrical engineering class and read quite a few post before buying.

My diagrams were based on how I'm setting up my chairs based on what I've learned here with buying a NEW subwoofer amp.


Checking your math... You have 10 shakers and 11 chairs... ??

----

I just re-read one of your posts. Some one suggested running many in series to reduce chance of damage but would reduce the total output power.


I stereo AMP would TRY to hook 5 in series to the Left Channel, and 5 in series to the Right Channel.

If mono Split in to two paralel sets of 5 in series.


I would think you need around 250W for the Amp - 25x10=250.

I'm not sure how running 5 in series will affect total output.

I'd give it a try.


My OLD PROLOGIC receiver is low Watts (don't remember amount) but they are shaking the recliners enough if turned almost all the way up. Its probably not helping that I'm splitting the SUB signal 3 times... *shrug*


Do you need a sketch on how to wire them up practically?

I can probably scan/upload it this weekend.

Have you tried mounting them yet???

Aren't there any BOYS at that college that are more than eager to get into your room to HELP you girlies out? *snicker*
 

·
Registered
Joined
·
5,605 Posts
Also, Jessica, call Chris in the Part Express wholesale department. He is a guru with Shakers. 1-800-338-0531
 

·
Registered
Joined
·
778 Posts
Discussion Starter #6
Sounds like a good suggestion!
 

·
Registered
Joined
·
5,605 Posts
Bob, another thought. Could she use a speaker selector box to control impedance? Some of those you can wire 10 speakers simultaneously.
 

·
Registered
Joined
·
125 Posts
Speaker selectors put a resistor in-line that makes sure you never drop below 8ohms.. They trade heat and efficiency to get more speakers. We just need to wire them to make sure they hit at 8ohm at the amp. (Or 4ohm if it will handle it).. I've got 4 25watt models on a Polk 100watt plate amp and have it turned down to 25% volume..


How you attach the shakers also have a great impact on their performance and efficiency. Springs will probably absorb as much energy as the transmit, and it would most likely take a lot of power to move relatively thin springs at lower frequencies. Try running a piece of wood between the cushion and the springs where you won't feel it, and attach the shaker to the wood.


Now back to the 10 shakers..


For a stereo amp and 8ohm per side:


Take 8 of the shakers and wire them in SERIES in groups of two.


This gives you 4 groups of 8ohm and two 4ohm shakers left over.


Take two of the groups and wire them in PARALLEL. Do the same for the other two groups. This gives you two groups of four shakers at 4ohms each.


Now wire in one of you left over shakers in SERIES with each of your groups of 4. That puts a group at 4ohm together with a single at 4ohm for a total of 8ohms per channel per group with two groups.

...................


For a mono amp at 8ohms. Take 3 groups of three with the 10th left over.


PARALLEL the three shakers together. That gives you 3 groups at 1.3ohm, and one shaker at 4ohm.


SERIES the three groups together for a total of 3.9ohm.


SERIES the single shaker in with the the group. 3.9+4=7.9ohm total..


I'll draw a diagram if that will help..
 

·
Registered
Joined
·
5,605 Posts
Yes, if you could draw a diagram I would appreciate it. What if I used a QSC RMX-850 bridged mono (850 watts into 2 ohms). How many Pro Bass Shakers could I wire to that 2 ohm load and not destroy either the amp, or the Shakers? That is probably too much power for that scenario. With this amp it may be better to leave it in stereo.
 

·
Registered
Joined
·
125 Posts

Quote:
How many Pro Bass Shakers could I wire to that 2 ohm load and not destroy either the amp, or the Shakers?

How many do you want?? You can play around with the ohms to get where you need to be.. The pro models are still 4ohm I think, and take 50watts a channel. So going by the 'numbers', you could put 17 on the amp and not be under or overpowered.. (in reality, you can be over or under, but over wattage would be better as you can still blow up the voice-coil with distortion..).


So 17... Wire 8 pairs together in series and get 8 8ohm groups and 1 4ohm shaker left.


wire 4 pairs of groups together in parallel and get 4 groups of 4ohms and one 4ohm shaker left.


wire 2 pairs of groups together in series and get 2 groups of 8ohm and one 4ohm shaker left.


wire the two groups together in parallel and get 1 big bundle at 4ohms and one 4ohm shaker left over.


Wire the group and the left over shaker in parallel and get a 2ohm final load.


And no, I'm not doing a diagram for that, but here's the two for the dorm room:



Two 8ohm groups:



One 8ohm group:



Good luck!
 

·
Registered
Joined
·
778 Posts
Discussion Starter #11

Quote:
Originally posted by Kevin D

How you attach the shakers also have a great impact on their performance and efficiency. Springs will probably absorb as much energy as the transmit, and it would most likely take a lot of power to move relatively thin springs at lower frequencies. Try running a piece of wood between the cushion and the springs where you won't feel it, and attach the shaker to the wood.

[/b]

OK for starters that 10 speaker setup is obviously above my head.


Kevin D can you also explain how to hook up 6 4Ohm speakers using my prologic receiver using L and R channels with input from my Pre-Amp out. (See diagram in beginning of post).

------

Shakers and Springs.


I could use some help/suggestions here...

I zip tied the shakers to the cushion springs based upon someone else's suggestion. This suggestion was good, because it required NO drilling.


How would you suggest I place a piece of wood (plywood? 3/8 shelving boards?) under my berkline recliners?


Thick foam (Top) - Thin Springs (Middle) - Shakers (bottom) is my current setup.

I don't think I can get a board between foam and springs without ripping apart my BRAND NEW berklines.

Were you suggesting:

Foam, SPrings, Board, Shaker? What will that do? Disperse the vibrations a little?

----

My PL receiver's power

I wish I knew the rated power output per channel. Perhaps the receiver is too weak and everything else is good... *shrug*
 

·
Registered
Joined
·
5,605 Posts
Thanks Kevin. Great diagram. And Bob, thanks for your diagrams. Jessica is going to get all this info at once Monday morning, he he.
 

·
Registered
Joined
·
125 Posts
Bob,


I apologize.. I looked at your diagrams and read your message, but must have skipped right over the 3 pair portion of it..


With three pair, you are limited to either 6 or 12 ohms.. I honestly think that your receiver would run fine at 6ohms, so I would try that first..


12ohms is simply series wiring all 3 shakers together on each side of the amp.


6ohms is two shakers wired in parallel for a 2ohm load and then this wired in series to the remaining shaker for a (2+4) 6ohm load..


Calculating it is pretty easy.. Series you just add the numbers.. two 4ohms is 8ohms.. Parallel is (R1*R2)/(R1+R2)... For the same numbers, you just half it.. (4*4)/(4+4) = 16/8 = 2...... If you had an 8ohm load and a 4ohm load, it would be (8*4)/8+4) = 32/12 = 2.66ohms, almost as low as two 4ohm speakers..


As far as attaching the shakers, in recliners you don't have much option. I'd have to see under the chair to really think about it, but I bet you could fit a strip of 1/4" ply between the foam and springs.. I'm thinking about 4-5 springs running front to back.. If it's crisscrossed springs, never mind about that idea..


You could try screwing them with small screws to the front/back, or sides of the chair frame.. Something to get the vibration up through the back of the chair, as the butt only effect gets old after a while..


Maybe zip tie a piece of wood across several springs? Again, if the springs all ready criss-cross and touch each other anyway, disregard..


You are losing some vibration through the zip ties too. No matter how tight you get them, they will never be as tight as one screwed into something else.. The wood works well because the shaker can become fully coupled with it and then has a larger area to hit more of the springs.. Right now your 5" circle of power is only transferring it where ever a spring is touching it.. So together you might only have a 1" circle of coupled energy..
 

·
Registered
Joined
·
435 Posts
First off thanks all for the replies, its greatly appreciated.



Sorry, but I'll be honest and state that I'm still not quite sure of the wiring. Can somebody physically draw a diagram, please
.

I know these (Shakers) are 4 ohms at 25 watts each, and would love to have the front two rows (6) shakers on one channel and the last row (4) shakers on the other channel.

Also should we get a 250 watt amp, or more?


We've had these badboys for sometime now and are anxious to get them bouncing.
They're mounted to the seats and just waiting for the hookup.


Thanks again for all your help.


Jessica
 

·
Registered
Joined
·
5,605 Posts
Anytime Jessica, but I am sure Kevin and Bob are giving you more help than I am. It is good to see a lady in the forum we don't see them that often and it is good to see not just guys are into home theater.

I would say for the non-pro Shaker of 25 watts x 10 Shakers a 250 watts amp would give each one 25 watts with good headroom.


"Whats a nice guy like you doing in a place like this?" I get asked that a lot.


 

·
Registered
Joined
·
5,605 Posts
Back to the bass transfered by a Shaker through a piece of wood. How thick do you need? Hard wood, or softwood?

TIA

Scott
 
  • Like
Reactions: sandydankness

·
Registered
Joined
·
435 Posts
Scott,

I would say hardwood, this gives a better resonance throughout your chair pending that the wood itself is mounted directly to the frame. Softwood would ever so slightly soften or deaden the "prescence" of the shakers as there really is no sound.

Think of the games at the amusement halls that you sit-in. They have the shakers mounted directly to the chair under your "Tucas" for maximum effect.


Jessica
 

·
Registered
Joined
·
5,605 Posts
Good point. I remember demoing Shakers (transducers) at Disneyland a long time ago. I also remember demoing them at WCES. The chair was soft, but it was a solid chair. My plan is to mount 4 Pro Shakers in my sweet spot black leather chair. It was a expensive chair. It does have solid bracing with wood already. But, I believe I will need at least a piece of walnut, or other hardwood for mounting these Shakers on the back and perhaps even the bottom. I want 2 hitting into my back and 2 hitting into my ass.
 

·
Registered
Joined
·
778 Posts
Discussion Starter #19

Quote:
Originally posted by hometheaterguy
Good point. I remember demoing Shakers (transducers) at Disneyland a long time ago. I also remember demoing them at WCES. The chair was soft, but it was a solid chair. My plan is to mount 4 Pro Shakers in my sweet spot black leather chair. It was a expensive chair. It does have solid bracing with wood already. But, I believe I will need at least a piece of walnut, or other hardwood for mounting these Shakers on the back and perhaps even the bottom. I want 2 hitting into my back and 2 hitting into my ass.

Two on the back: All I can say is OUCH or thats gonna be a great massage!!! (Do you mean Pro or normal version?)


(I won't comment on 2 hitting into your ass.)


Do you want to feel the movie or fall out of your chair?
 

·
Registered
Joined
·
5,605 Posts
You think I will need a lead vest to protect my kidneys? LoL! I already have a M&K sub hitting me in the face, rear, right and a dual 15" ported cabinet front left corner. Talk about putting the "theater" in home theater, sheese. I want to get the Pro version. The amp I have for the Shakers is a QSC RMX-850 (200W X 2). I want to feel the bass more, a back massage would be great. Do you think I should just use two Shakers?
 
1 - 20 of 2917 Posts
Top