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Bass Shakers - Page 5

post #121 of 1151
If your secondary is 85wpc at 8 ohms, then wire the two shakers in series (to acheive an 8 ohm load) and only use 1 channel on your secondary amp. putting a 4 ohm load (1 shaker alone) on that amp could cause it some problems, especially at high volumes.

so...

1) L only (or R only)
2) use a high quality splitter - I haven't had any problems.
3) Screwing shakers into a solid piece of the frame distributes the vibration over the entire seat.
4) changing the primary will change the proportional volume from the secondary... tune to your liking.
5) 2 in series, or you're taking your chances.

good luck.
post #122 of 1151
If i was to use the following amp to power 5 Aura Pro 50 watts shakers http://www.partsexpress.com/pe/showd...Number=300-793

Can somebody pls explain to me how i would wire them up so they got even power?

THanks Dale
post #123 of 1151
Is there any reason why more people aren't using the Parts Express Amp which was linked earlier in the thread? It seems to go down to 20 Hz as well as provide more than enough power (250 Watts into 4 Ohms and 150 Watts into 8 Ohms). It also has built-in crossover Frequency Control and a remote control. It seems to be a good deal at $139.80. Just wondering...

Scott
post #124 of 1151
albrigsr,
Are you even reading this thread? Seriously. We've been talking about the additional flexibility of a reciever for pages now...
post #125 of 1151
David,

I have been following the thread and just re-read each post to ensure I wasn't missing anything related to the additional flexibility. I still see few if any any posts related to "Flexibility" that a Receiver has over the Parts Express Amp (i.e. Volume Control, Remote Control, Adjustable Crossover). Did I miss something? (I assume I have considering the tone of your message). I seriously want to know becuase I have purchased some Shakers based on this thread and am now deciding the best way to power them.

Scott
post #126 of 1151
Given the difference in LFE on different movies it seems critical to have the ability to control the "volume" of the shakers....... hence the need for a dedicated receiver (versus a straight amp)
post #127 of 1151
Pcrx, shouldn't matter if said amp has a remote volume control..I believe the one that he linked to does..Let's all play nice..

brickie
post #128 of 1151
Scott-

I think I was looking at a different amp.... for sure though meant no offense or anything..... all nice here!
post #129 of 1151
Quote:


Originally posted by David_Larkins
If your secondary is 85wpc at 8 ohms, then wire the two shakers in series (to acheive an 8 ohm load) and only use 1 channel on your secondary amp. putting a 4 ohm load (1 shaker alone) on that amp could cause it some problems, especially at high volumes.

I just found out that my Yammies have an impedance selection switch and can switch between 8 or 4 ohms. So, with a little time on hand, I experimented with the different ohms and wiring of the 2 bass shakers. IMO, I think having it on 4 ohms and 1 shaker on each channel is most effective.

Also, I found out that by switching off my sub, the shakers don't vibrate... strange... but I'm sure many veterans here probably know why.

Considering I have only a pair of 25w shakers, they seem to be increasing the LFE output due to its vibrations. At first, I thot it was psychological until my wife said she heard/felt more rumbling from downstairs.

The best scene that I demo'ed was the T-rex first appearance in Jurassic Park. During the first few stomping, the boy in the car asked "Did you feel that?" .... my wife and I were nodding our heads "YES".... hehehe.
post #130 of 1151
albrigsr,

My apologies. My tone was a bit harsh. One of the main things that I like about my 'shaker receiver' is that I can be watching cable tv or something, and have it off, then switch to a movie and turn it on. A receiver does offer some additional advantages over the amp you propose. First, the PE amp is auto on/off, so you can't turn it on/off from the remote. Second, it's a plate amp, so it really needs to be housed in some type of enclosure. I guess you could build a small enclosure, but that requires some work. One thing that it does have going for it is that it has some x-over flexability. I personally have not found the need for additional control over that aspect, but many have.

Bottom line is - FOR ME, a good used receiver paired with these shakers represents the best value and flexibility.
post #131 of 1151
I agree with David. The only reason I would need crossover management is with Pro-Logic material, but controlling the volume/power on the shakers does the job very well. In fact, there's a kind of "cool" factor when you see two receivers on the rack (both displaying "DVD" on the front panel). My guests are impressed by the amount of power it seems to indicate.
post #132 of 1151
David (and all),

Thanks for the responses. I didn't catch that it was an auto on/off switch which kind of kills it for me since I agree with wanting the ability of remotely turning it on/off as desired based on the source material. Not building an enclosure helps save time too. Thanks again for listing the differences!
post #133 of 1151
Starting reading about bass shakers yesterday and went ahead and ordered 4 sets of the 25watt version. I don't have an extra receiver laying around and don't know specs on older receivers to make sure I find one that definitely hits the low bass...so can anyone point out an inexpensive receiver (less than $250) that can be used to power 2 or 4 bass shakers TODAY (not sure if I'm going to keep my current room with 2 seats or add 2 more) and can still be used when I move to a new place where I'll have 8 theater seats/shakers? (I would rather spend the money now knowing the receiver will still meet my needs in roughly a year in a larger HT environment and several more seats.)

Thanks!
post #134 of 1151
You shoul dhave no problems finding a receiver in that price range at CC or BB that fits the need..The problem some of us had is wanting to use a a "cheaper" Sherwood that was on sell ,but only went down to 40hz..Just not sure if that would cut it.At the price point you're at you should be able to find a Pioneer, or Sony that is full blown DD,DTS...I'm sure that will do the trick..

Also got my f-mods today, but nah i haven't even opened box..Wife forced me to barbecue.Just not enough time in the day..Will probably wait until the weekend.

brickie
post #135 of 1151
Brickie,
Even if I got a 5.1 or 6.1 receiver, (eg 100w x 5 or 6 channels), you don't use it that way, right? You switch the receiver to 2-channel stereo mode and use the Front Left and Front Right only? (I guess all I need is 100w per channel then. 25w x 4 bass shakers would be 100w. Run 4 shakers on each channel?
post #136 of 1151
You would be correct..My only point really in getting a true DD receiver would be that I KNOW it would go down to at least 20hz.It seems alot of the cheaper stereo receivers we might want to use just don't dig deep enough.

brickie
post #137 of 1151
Yeah...I noticed that the sub-$125 receivers pretty much seem to stop at 40hz. I want 20hz though. LOL. I'm not to keen on having another receiver on the rack but want crossover and level/volume control....I thought about going with the sub plate amp from PE, but I don't want to bother making an enclosure for it.
post #138 of 1151
If i'm not mistaken you want get x-over control thru a regular receiver..I think that would be a benefit of the plate amp..You could get some f-mods though.Mine came today ,but haven't had a chance to even open box yet.

brickie

I think i'll go do that now.
post #139 of 1151
Tried a suggestion from one of the members in this thread, I plugged the RCA L and R to the 'phono' inputs of the secondary receiver. But it causes the secondary to power off, whenever the bass kicks in. Strange.... perhaps that's the Yamaha's internal controls. So, it's back to the 'DVD' inputs.
post #140 of 1151
I'd recommend the DVD input. It works fine with a line-level signal while phono is really made for the very faint signal coming from a turn-table. If you really want your shakers to boom and bang the snot out of you, just turn up the volume on the receiver driving them.
post #141 of 1151
I have my main Yamaha 5790 receiver xover set to 80hz. Will this bypass whatever setting the second receiver is at or will I need to adjust the second one (that's acting as the amp) as well? Gonna hit BB and CC tonight.
post #142 of 1151
Quote:


Originally posted by Del Laird
I have my main Yamaha 5790 receiver xover set to 80hz. Will this bypass whatever setting the second receiver is at or will I need to adjust the second one (that's acting as the amp) as well? Gonna hit BB and CC tonight.

The secondary amp's bass management (if any) should be set to mains only and the mains size set to 'large'. Not sure how you can set xover from the amps, but if u can, the secondary's xover should be set the same as primary.
post #143 of 1151
Quote:


Originally posted by pixel8

Also, I found out that by switching off my sub, the shakers don't vibrate... strange... but I'm sure many veterans here probably know why.

Looks like the sub is doing the driving of the shakers. If that's the case, I'd be able to control the volume and cutoff frequency of the shakers from the sub's controls.
post #144 of 1151
Look for a refurb Onkyo 8511 at ecost, better than the crap you'd get at CC or BB for the same $$$.

You could also check out ebay item # 3094642247, Harman Kardon sells their refurbs direct on ebay, from the history these units generally go between $130 & $150.
post #145 of 1151
Quote:


Originally posted by pixel8
Also, I found out that by switching off my sub, the shakers don't vibrate... strange... but I'm sure many veterans here probably know why.

That is just odd and shouldn't be happening. How did you split the LFE line? Are you using a splitter or using the line-out of your sub?
post #146 of 1151
Del Laird,

Somebody earlier posted a Sony Amp which is 100W per channel and goes down to 20Hz. It is at CC for $129.99.

http://www.circuitcity.com/detail.js...toid=-8021&m=0
post #147 of 1151
albrigsr,
Thanks...saw that at CC last night but my local shop was out of stock. Since I'm only looking for a second amp, all I need is 100 watts per channel and something that can go down to 20Hz. Everything else is non-essential. It looks like it'll work just fine.
post #148 of 1151
If my Onkyo doesn't work out,i may look into that one..I saw it when i was there over the weekend but i was in super cheap mode and didn't get it..

brickie
post #149 of 1151
Okay i just mounted all my bass shakers..I'm going to try and use 6. Iv'e got 2 on the loveseat,3 on the couch, and 1 on the papason chair..That was the hardest to mount due to it's shape.But i have 3 screws in and it's wrapped with " tie wire ", so it's not going anywhere.That's the stuff we use to secure scaffold to buildings..Much stronger than plastic wire ties..Now let's go see if i have enough speaker wire to get this done today.

brickie
post #150 of 1151
Quote:
Originally posted by Vantorax
That is just odd and shouldn't be happening. How did you split the LFE line? Are you using a splitter or using the line-out of your sub?

I'm using a splitter (Y-shaped RCA cable). The only difference I see is that my subwoofer has 2 RCA inputs (L/R) as compared to others (1 input). Below is a rough diagram :-

.......................Primary amp
.................................!
.................................!
............................../....\\
............................/........\\
......................... /........... \\
.........................!..............!
.........................!..............!
......................../.\\........... /..\\
....................../.....\\........./.... \\
.......................Sub.......Secondary
....................................dvd input

Also could it be that my sub is an active sub and others in this thread are not? Nevertheless, I think it's quite ok, considering I can control the bass shakers from the sub's controls (cutoff freq, volume, phase, etc.)
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