Yet another dual opposed mfw 15 build (my first ever) - Page 4 - AVS Forum
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post #91 of 141 Old 07-29-2011, 10:51 PM - Thread Starter
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Thanks for all the compliments, it truly does mean a lot. I really owe it all to this forum, it was this place that even got me thinking diy..

About the binding post question, the answer would be, uh idl? lol
I bought a speaker terminal plate from parts express very similar to this.

http://www.parts-express.com/pe/show...number=260-281

So they are kinda binding posts, but they are mounted to a plate, so I am going to go with your call on that.

Have a good one...

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #92 of 141 Old 07-30-2011, 06:15 PM - Thread Starter
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For those with an ep4000, would you get better results splitting the input signal and feeding both inputs and running the amp in stereo, or just running to one input and setting the jumper to parrellel?

and about those jumpers, I don't want the amp to add any kind of filter, I just want to amplify the signal my AVR sends. so what would I set them to?

thanks for the help.

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #93 of 141 Old 07-31-2011, 02:01 AM
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Quote:
Originally Posted by Audiophile34 View Post

For those with an ep4000, would you get better results splitting the input signal and feeding both inputs and running the amp in stereo, or just running to one input and setting the jumper to parrellel?

Not sure about the jumper/switch settings as I don't have that amp, but I would just run one cable and run the amp in parallel mode. Either way should yield the exact same results, but running it in parallel mode simplifies connections as yo only need one cable.
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post #94 of 141 Old 07-31-2011, 05:14 AM
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Quote:
Originally Posted by Audiophile34 View Post

For those with an ep4000, would you get better results splitting the input signal and feeding both inputs and running the amp in stereo, or just running to one input and setting the jumper to parrellel?

and about those jumpers, I don't want the amp to add any kind of filter, I just want to amplify the signal my AVR sends. so what would I set them to?

thanks for the help.

I think the real question here is the input voltage. I don't know the exact answer, but I'm leaning towards the parrallel option.

Here's why: There have been multiple discussions about the input voltage requirements on the pro amps. To get full power out you must supply an input voltage(sub cable signal) equal to or greater than the input sensitivity of the EP4000. If you use a splitter you divide the available voltage in half.

These questions you must answer and you'll have your answer:
  1. Whats the output voltage on my AVR's sub pre out
  2. Whats the input sensitivity of the EP4000 in stereo mode
  3. Whats the input sensitivity of the EP4000 in parallel mode
Hope this helps!
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post #95 of 141 Old 07-31-2011, 08:28 AM - Thread Starter
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I don't think that I and having a problem driving the amp to capacity. When I put some BASS heavy music on and approach reference, I have no problem driving the amp to clipping. So I know that I have the voltage even when running through an RCA Y adapter.

My question was more about SQ, would there be a difference?

And would the extra connections inline with the y adapter introduced any more noise?

The jumper setting are confusing the hell out of me. I think I have it right, but there are articals on here and "the shack" that state that the silk screen in the back of the amp is incorrect.

So to those that have a set up similar, how do you have things set?

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #96 of 141 Old 07-31-2011, 12:17 PM
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Quote:
Originally Posted by Audiophile34 View Post

So I know that I have the voltage even when running through an RCA Y adapter.

My question was more about SQ, would there be a difference?

If you are using a Y adapter and the run is short then you should not hear any difference in sound quality. You will only hear a difference if you had a true x.2 capable processor/receiver like the Denon AVR-4311. These units will EQ each sub separately for optimum sound. In this case you will want to run the amp in stereo mode.
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post #97 of 141 Old 07-31-2011, 12:29 PM - Thread Starter
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So I should buy a new RCA cable? I am using an old RCA that I have had for awhile that I bought for my old place in which I had the sub on the other side of the room. So the cable is 25 ft I think, but I need less than 10ft now...

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #98 of 141 Old 07-31-2011, 12:39 PM
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No need to replace the cable unless you are having problems with it or can't live with all the excess cable lying around causing clutter.
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post #99 of 141 Old 07-31-2011, 01:30 PM - Thread Starter
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I do have a major hum issue, that I made much better (but still audible). By running a wire from chassis ground on my onkyo.



To the shield side of my RCA before it runs into the y adapter.



This made a HUGE difference, but it's still annoying at low volumes. what else can I do?

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #100 of 141 Old 07-31-2011, 01:36 PM
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Trying to find the source of the hum is beyond my expertise, but things you should try is to disconnect all other devices from your AVR and the outlets first and see if that eliminates the hum. If it does, then reconnect them one at a time to see which one is introducing the hum. If it doesn't then try plugging the amp into another circuit.
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post #101 of 141 Old 07-31-2011, 01:42 PM
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Quote:
Originally Posted by duc135
Trying to find the source of the hum is beyond my expertise, but things you should try is to disconnect all other devices from your AVR and the outlets first and see if that eliminates the hum. If it does, then reconnect them one at a time to see which one is introducing the hum. If it doesn't then try plugging the amp into another circuit.
Do u have a BFD hooked up?
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post #102 of 141 Old 07-31-2011, 01:47 PM
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Do u have a BFD hooked up?
Not sure what a BFD is so I'm guessing I don't.
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post #103 of 141 Old 07-31-2011, 01:54 PM - Thread Starter
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BFD? nope. all I can think of there is nothing to do with audio, and all the reason I just had a son.

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #104 of 141 Old 07-31-2011, 02:01 PM
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Quote:
Originally Posted by Audiophile34
BFD? nope. all I can think of there is nothing to do with audio, and all the reason I just had a son.
I've heard of incoming cable lines being the source of hum. Try unplugging the cable line from the system.
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post #105 of 141 Old 07-31-2011, 02:04 PM
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Quote:
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I've heard of incoming cable lines being the source of hum. Try unplugging the cable line from the system.
So are you are you going to tell us what a BFD is? Inquiring minds want to know.
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post #106 of 141 Old 07-31-2011, 02:29 PM - Thread Starter
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I think I figured it out...

B.F.D= beringher feedback destroyer. Yay! now were is my cookie...

To answer the question, no, I do not. I have a mini dsp, but that is neither configured, not implemented, as I require capital for the necessary SPL meter and connections....

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #107 of 141 Old 07-31-2011, 02:31 PM
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Quote:
Originally Posted by Audiophile34
I think I figured it out...

B.F.D= beringher feedback destroyer. Yay! now were is my cookie...

To answer the question, no, I do not. I have a mini dsp, but that is neither configured, not implemented, as I require capital for the necessary SPL meter and connections....
Sorry about that. BFD's are known to cause a 60hz hum...that's why I asked.
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post #108 of 141 Old 07-31-2011, 02:38 PM - Thread Starter
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No worries mate, It's all good. Anyone got any other ideas?

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #109 of 141 Old 07-31-2011, 05:14 PM
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Real nice build and your woodworking skills for a first timer are excellent ,they must be due to you being a machinist.. being able to measure and cut at the right place.. You just gave me an idea what to do with two spare Adire Tempests I have...

One thing I will comment on and I hope you dont' mind is the Y connector... it looks flimsy I would get a better quality one...

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post #110 of 141 Old 07-31-2011, 05:29 PM - Thread Starter
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No offense taking man, I actually ditched it a couple of hours ago. It's in the garbage along with my old RCA cable. I just figured I could buy a new cable and try it out, if it didn't help with the hum issue, I could always return it.

But when I plugged the new cable in, my hum, was GONE unless I turn the gains up on my ep4000 all the way.

So for me, a new shielded RCA fixed my problem.

Thank you very much for your kind words. I am already thinking of future projects....

Going to see a build thread about those tempests?

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #111 of 141 Old 07-31-2011, 05:35 PM
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I am leaving next week on a month long vacation when I come back next month I will do it. I had a slight hum and I grounded my denon to my sub amp body and it seemed to help it's prolly the same thing you did but I thought of mentioning it.

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post #112 of 141 Old 07-31-2011, 07:16 PM
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Quote:
Originally Posted by duc135

So are you are you going to tell us what a BFD is? Inquiring minds want to know.
I believe BFD is the Behringer Feedback Destroyer. Mosty used in Home Theater System to EQ the Subwoofers, Add Filters, Etc.
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post #113 of 141 Old 07-31-2011, 08:50 PM
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Quote:
Originally Posted by Audiophile34 View Post
But when I plugged the new cable in, my hum, was GONE unless I turn the gains up on my ep4000 all the way.

So for me, a new shielded RCA fixed my problem.
Your shouldn't get a hum at all even with the gains turned all the way up. It could be the rca/xlr adapter that is adding some noise as well, sometimes these are low quality and not wired up correctly.

"Half the world is looking for Jesus, and the other half is looking for more bass..."
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post #114 of 141 Old 07-31-2011, 08:57 PM - Thread Starter
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Maybe, but until I get the mini dsp in line, I am content with the cabling for now.

But as to what I am going to do once I try and get that thing working, I am not sure...

Should I just cut my brand new cable right in half, and wire to the Phoenix connection that way? Is the inside of an RCA cable coded in some way to insure proper polarity?

Uber nervous about that.....

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #115 of 141 Old 08-01-2011, 05:04 PM
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So, how does it sound? Did I miss that?
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post #116 of 141 Old 08-01-2011, 05:07 PM
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Did you do the fan mod? If so where did you get the fan I can't find them anywhere
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post #117 of 141 Old 08-01-2011, 05:48 PM - Thread Starter
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No, I have not done the fan mod, I honestly don't know if I am going to. Right now the ep is about 15 ft from lp, and about 4 ft above ear level.. So the fan, doesn't bother me yet. (I may change my mind once the weather cools and we don't have fans running almost all day)

As far as the sound goes, what can I say that has not bin said?

I came from a single cerwin vega lw15, so pretty much anything would be a step up. These are a Ten story jump up. But they are a completely different animal.

The cerwin used to rattle the ceiling panels in the adjoining kitchen something fierce, to the point where I heard that more than the bass. It was a ported sub, that had typical tubby, muddy, undefined,sound. I bought it cause it was the most expensive sub they had at the store in the little sh%t hole town I was living in.

To compare that to these, well there really is no comparison. That would be like a head to head on a road course between a dump truck and a corvette. Sure, the dump truck will cross the line, but not nearly with the finesse and beauty of the corvette.

The 2 dual opposed cabinets, have a much more even room response, than anything I have ever experienced before.

At first, for music the sound made me feel that maybe I had done something wrong, but after some tweaks raising the output level from the avr, and running auddasy, I was astounded by the level of detail, the speed of the transiants, and the overall depth of the sound.

Then the kids and I watched Rango, and the impact of some of those scenes surly put a smile on my face. The next night, hungry for more I rented the last Narnia movie, and again was like a kid once more. The scene where they are in the boat, during a thunderstorm, I thought maybe it was real, I actually paused it to see if I had to run around the house closing windows.

I mentioned earlier that my old sub used to shake things in my house, the new set up, shakes the inside of me. I feel the visceral impact of explosions, the thunder radiates in my guts.

There really is no words to explain how happy I am with these 2 cabinets, and this is before I get the mini dsp online with this setup. I truly cannot wait for that day.

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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post #118 of 141 Old 08-01-2011, 05:56 PM
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From your last post it sounds like your ready to watch battle: Los angeles

I would take a measurement before anything...you might not even need an eq.
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post #119 of 141 Old 08-01-2011, 06:23 PM
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Did you just use wood cuts out for your grill?

Are they just wedged in or did you use magnets?
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post #120 of 141 Old 08-01-2011, 07:29 PM - Thread Starter
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Oh yeah? Lfe a plenty in battlefield?

Got to pick a good one for adult movie night.. Any other suggestions?

My first DIY project. A dual, dual opposed setup

www.avsforum.com/avs-vb/showthread.php?t=1345494
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