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"Need Major Help On DIY Sub" - Page 2

post #31 of 82
HO = small/average sized ported box

HF = large sealed box/huge ported box
post #32 of 82
Also the HO requires quite a bit more power. If you don't mind a huge ported box you can save money on the amp with the HF.
post #33 of 82
Thread Starter 
Would the ep400 for about $250 due the trick?
post #34 of 82
ep4000 for (2) 15" HF's? Yes, that would more than do the trick. I can't remember exactly but I think it puts out around 600 watts per channel at 4 ohms which is actually a little too much, so if you hear distortion don't push it any further. When I had my HF tuned to 18hz with only 300 watts I could push it to distortion, so it isn't very power hungry.
post #35 of 82
Thread Starter 
Will 2 of them rock a 14x22x7.5 room?
post #36 of 82
if you have plenty of space for a sub, build an F20 or THT (as mentioned earlier). You will spend less on drivers and have less of a power requirement. Even a decent home stereo receiver or amplifier will give you surprising output, you may already have something like this laying around. YOu will need an eq, but for $50 on ebay you could pick up a Beringer Feedback Destroyer and use as a parametric EQ. OR....get an INUKE 1600DSP or 3000DSP, which will have the eq and limiters built in.
post #37 of 82
I thought about recommending that but he doesn't want anything huge. If it were me I would sell the svs and build (4) F20's and not have to spend a dime.
post #38 of 82
Thread Starter 
I don't have a svs to sell... and the f20s look way to large for my room. I think Jay's idea is the way I'm headed, basically a copy of the rythmik FV15 in a way. No matter how it turns out I know it will blow away the 2 8's I'm running currently. Could I take those 8's and stick them under or behind the couch for added bass or while that ruin the sound?
post #39 of 82
Whoops posted the svs response in the wrong thread...
post #40 of 82
Quote:
Originally Posted by studioholic55 View Post

Would the ep400 for about $250 due the trick?

If you do the 27hz box the EP4000 is all you need (30hz HPF). If you go with a 20hz tune you will need a different HPF. With the 27hz box you could actually dump 2000 watts from a single bridged ep4000 into each sub without bottoming it (might melt the driver though). With the 20hz tune a single ep4000 channel at 650 watts is a perfect match.
Quote:
Originally Posted by studioholic55 View Post

I don't have a svs to sell... and the f20s look way to large for my room. I think Jay's idea is the way I'm headed, basically a copy of the rythmik FV15 in a way. No matter how it turns out I know it will blow away the 2 8's I'm running currently. Could I take those 8's and stick them under or behind the couch for added bass or while that ruin the sound?

You can incorporate the 8"s, not sure which model they are? Obviously they wont be able to keep up at full output, but smoothing the response at lower levels is possible.
post #41 of 82
Thread Starter 
So the ep4000 will work with a 20hz sub?? Also why do most of you guys use feedback destroyers on sub? There isnt any feedback to destroy correct?
post #42 of 82
The ep4k will work but you will need a different high pass filter. The feedback destroyers are used for their parametric EQ abilities and because they work with REW.
post #43 of 82
Thread Starter 
Ok what do you recommend then and what does a high pass filter do exactly? It's different than a crossover? confused.gif
post #44 of 82
A high pass filter will cut off the frequencies below what you set it at. Ported designs need one because the driver will unload once past tuning and damage itself. It's a safety.

I believe the Minidsp allows you to set hpf's. then you could use it for that and a sub EQ. You would want the balanced version with that amp.
post #45 of 82
Thread Starter 
Any thing cheaper than $150?? Why couldn't the ep4000 to the trick? Does the settings not go down to 20 hz.?
post #46 of 82
The EP4K has either a 30hz or 50hz filter. It's a pro audio amp, there's no need for a 20hz setting.
post #47 of 82
Well the inuke 3000dsp amp is $293 at amazon right now. It has a 20hz hpf and EQ.
post #48 of 82
Thread Starter 
Is it just as good as an amp as the ep4000? I'd rather set it at 30hz. than buy a crummy amp.
post #49 of 82
I wonder if anyone has experience with these. Would be a cheap way to still use a ep4k

http://www.parts-express.com/pe/showdetl.cfm?partnumber=266-246
post #50 of 82
Thread Starter 
So i could put them in between my receiver and amp line?
post #51 of 82
Yes if it works as advertised. I don't see why it wouldn't. I would make a call to Parts Express to verify. Unless someone is familiar with them.
post #52 of 82
I'm not familiar with them, but have heard bad things. I was going to us them before but was shot down by reputable avs members. I don't remember who and when but you could look through all of my posts if you wanto to find out why.

As stubborn as I am I would still like to know how they work, even though I was told no...
post #53 of 82
Quote:
Originally Posted by brian6751 View Post

Yes if it works as advertised. I don't see why it wouldn't. I would make a call to Parts Express to verify. Unless someone is familiar with them.
They do work, but not very well. Being passive their high pass frequency is defined by the input impedance of the device being driven. As that's not a standard value for amps the actual high pass frequency could range anywhere from 5 to 50Hz.
post #54 of 82
Quote:
Originally Posted by Bill Fitzmaurice View Post

They do work, but not very well. Being passive their high pass frequency is defined by the input impedance of the device being driven. As that's not a standard value for amps the actual high pass frequency could range anywhere from 5 to 50Hz.

That won't work then.
post #55 of 82
Thread Starter 
Well that sucks then. frown.gif Can you guys explain to me what it means when a driver 'unloads'? I apologize If this has already been answered previously, but do any of the crest audio amps (ca-4/6/9) or crown amps have a HPF? And would buying a dbx-120 sub-harmonic aid to my subs performance? I only ask because my uncle runs one with his Klipsch 115s.
post #56 of 82
Quote:
Originally Posted by studioholic55 View Post

would buying a dbx-120 sub-harmonic aid to my subs performance?.
IME all they're good for is blowing drivers. Put the money into a DSP.
post #57 of 82
Thread Starter 
What do you mean by DSP? Digital sound processor?
post #58 of 82
I've used the FMODs, they have their place but I don't like the non-adjustability of them. It was great for throwing together a quick system with an extra amp and sub, back before we had the tools like BFD and miniDSP but unless you get lucky and have just the right one, you almost need to try a couple. And it seemed like it dropped the level of the freqs I wanted to pass a bit too but I could be wrong on that part.
post #59 of 82
Thread Starter 
Ok so if I build a 22x26x24 box with two 3in. ports with the Dayton Audio RSS390HO I can get to 20hz. right? I'm planning on buying the inuke 3000 and using the 20hz. filter. If anyone could crunch the numbers in WinISD for me and calculate the port length I would greatly appreciate your help. Please let me know if I'm am still missing a major piece of gear. Thanks! biggrin.gif
post #60 of 82
Quote:
Originally Posted by studioholic55 View Post

Ok so if I build a 22x26x24 box with two 3in. ports with the Dayton Audio RSS390HO I can get to 20hz. right? I'm planning on buying the inuke 3000 and using the 20hz. filter. If anyone could crunch the numbers in WinISD for me and calculate the port length I would greatly appreciate your help. Please let me know if I'm am still missing a major piece of gear. Thanks! biggrin.gif

That box is about 1 ft3 larger then you were originally discussing. A pair of 3x17 ports will tune you to 18hz, if you cut them down to 13.5" you will have 20hz. You could even do three 3x17 ports (think svs ultra) for a 23hz tune. The pair of 4x17 ports would actually tune you to 24hz now in this larger box. Just make sure you put some kind of a cross brace or two in there.
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