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which would be better for ported... - Page 5

post #121 of 264
just found this one: http://www.troelsgravesen.dk/vent_tuning.htm
post #122 of 264
And to make matters even more confusing, here is a paper from one of the WinISD authors that lists the end correction from many different software programs. He also make a dubious claim about multiple ports as follows:
Quote:
Originally Posted by Janne Ahonen 
Please note that this version of TermPro seems to calculate multiple ports wrong, probably SW author has not understood how end correction really works. It just calculates sum of area of all ports, and then calculates length using this area like a single port. This is not correct, because end correction is determined by the single port.

Beranek says to just use sqrt(Area / pi) to replace the radius in the end correction equations, which does not agree with the above.
post #123 of 264
Thread Starter 
oh, how is the Peavey IPR 3000 (not the IPR2) on wattage? is the 840 rms watts per channel at 4 ohm real world or not? they're only $350 at Guitar Center right and with peavey's reliability I'm tempted... I don't know if it's bridgeable though since some of them aren't bridgeable from what I've seen (I know a lot of the IPR2's aren't...
post #124 of 264
Thread Starter 
Bump on the peavey ipr questuon
post #125 of 264
post #126 of 264
btw, the ipr already appears to be discontinued in favor of the ipr2. maybe they made some changes. given that, i'd probably avoid the ipr, but that's just me.
post #127 of 264
Thread Starter 
crap, I literally just jumped on the order since guitar center only had 2 left... I'll see if I can cancel it.


Order cancelled.
Edited by wormraper - 9/14/13 at 7:13am
post #128 of 264
Thread Starter 
*sigh, back to the drawing board for amps...

I'm requesting my buddy who's installing the 20 amp circuit into my house do a 30 amp circuit instead. if he can do 30 then I'm putting a peavey IPR2 7500 in instead if I can

otherwise I'm gonna still be looking at the INUKE's and the EP4000's most likely frown.gif (I hate having to buy Behringer if I don't have to )
post #129 of 264
not sure why you are so upset. the peavey ipr 1600 appeared to offer its claimed power at 4ohms channel, so the 3000 probably does too. redface.gif
post #130 of 264
Thread Starter 
Quote:
Originally Posted by LTD02 View Post

not sure why you are so upset. the peavey ipr 1600 appeared to offer its claimed power at 4ohms channel, so the 3000 probably does too. redface.gif

lol, not upset ... just still chasing after that dream of the perfect amp wink.gif... I was just taking your advice on skipping it.. I honestly have never bought a pro amp before so It's like flying blind biggrin.gif...I'm just trying my hardest NOT to make a decision I'll regret later here.

(although I'm an insane deal hunter, I can smell a sale a mile away, so the hunt is still kinda fun biggrin.gif )
post #131 of 264
ah...
post #132 of 264
May I ask a question? What kind of electrical protection are you guys, in the US, using? You are on 120V so how come you think 20A is not enough? Its not as if a fuse melt at 20.1A or a breaker trips immediately at a small over-current. At least not here in Europe.
post #133 of 264
Thread Starter 
didn't mean to make it sound like I was upset... so many amps out there with huge price differentials it's sometimes hard to see which is the best buy. while I know the EP4000 and Inuke's are workhorses I just hate that fan that comes with them ... from what I gather sounds like a jet engine... and I know the peavey and crown series have some DEAD silent Class D's... so I was hoping to find a suitable replacement that I wouldn't have to mod... (don't like voiding a warranty). but that ships sailed. I noticed that guitar center is now out of stock of the IPR3000's that they had left in stock... the hunt continues!!
post #134 of 264
"What kind of electrical protection are you guys, in the US, using?"

most homes have circuit breakers with some sort of trip delay. you are right, more current than 20 amps can slip through for a bit without a problem and ohm's law doesn't really apply to real subwoofer power consumption (for the most part), but erring on the safe side never hurt anybody either...
post #135 of 264
Thread Starter 
Quote:
Originally Posted by LTD02 View Post

"What kind of electrical protection are you guys, in the US, using?"

most homes have circuit breakers with some sort of trip delay. you are right, more current than 20 amps can slip through for a bit without a problem and ohm's law doesn't really apply to real subwoofer power consumption (for the most part), but erring on the safe side never hurt anybody either...

exactly, and some trip breakers are more sensitive than others, but as Hannibal smith said in "The A-team....."Overkill is under rated"
post #136 of 264
Quote:
Originally Posted by LTD02 View Post

..., but erring on the safe side never hurt anybody either...

That of course is true, but it might get a little expensive if you are too safe :-) Have you ever looked at the trip curves for the breakers you are using? You might be surprised at how much current you can actually draw for shorter durations. Depending on the specific characteristic of the breaker it might be 1.5 times rating for one whole minute, 2 times rating for ~10 seconds and 5 times rating for 1 second. Now of course i dont know anything about US electrical codes, but i cant imagine you would ever trip a 20A breaker except for extreme SPL with multiple sealed subs. Have any of you actually tripped a breaker while watching a movie?
post #137 of 264
Thread Starter 
Quote:
Originally Posted by splotten View Post


That of course is true, but it might get a little expensive if you are too safe :-) Have you ever looked at the trip curves for the breakers you are using? You might be surprised at how much current you can actually draw for shorter durations. Depending on the specific characteristic of the breaker it might be 1.5 times rating for one whole minute, 2 times rating for ~10 seconds and 5 times rating for 1 second. Now of course i dont know anything about US electrical codes, but i cant imagine you would ever trip a 20A breaker except for extreme SPL with multiple sealed subs. Have any of you actually tripped a breaker while watching a movie?

lol, yeah it would get expensive real fast, but since i"m ALREADY installing a dedicated circuit it's only 50 bucks more expensive than a 20 amp circuit and it allows for a lot more headroom if I wanna use a CV-5000 or IPR 7500 with 4 18 inchers
post #138 of 264
Yes of course. If you are doing it anyway you might as well get 30A. Mostly its the labor thats gonna cost you. Not the parts.
post #139 of 264
Thread Starter 
Quote:
Originally Posted by splotten View Post

Yes of course. If you are doing it anyway you might as well get 30A. Mostly its the labor thats gonna cost you. Not the parts.

yeah, luckily my friend is an electrician and he's only charging $50 labor for the whole job, so I'm lucky in that regard
post #140 of 264
Thread Starter 
well, still heavily considering the Inuke 6000... only question is... with the fan mod do you void the warranty? (I would assume so)... I'd hate to have a problem with the amp and have to send it in only to be denied because of that fan mod...(can get the regular inuke 6000 for $325 at musicians friend this week)

oh, and does the regular 6000 have the same voltage limiters that the dsp version has and if not could I do the same with a mini dsp?

or... I might run both subs off one channel since it puts out 1800 watts and use the other channel when I get 2 more wink.gif.... with all 4 subs maxing out the wattage would I still be ok on a 20 amp circuit or with all 4 subs would it be better to have my electrician install a 30 amp?


and this is just a random question. I noticed the 30 amp outlets are MUCH different than a 15 or 20 amp outlet... how in blazes would the Inuke 6000 or CV-5000 or IPR 7500 even PLUG IN to a 30 amp circuit?
Edited by wormraper - 9/15/13 at 12:15pm
post #141 of 264
Just noticed your question about bridging the ipr 3000; the answer is yes, it can be.

The 6000/7500 cannot be, as they're essentially a pair of bridged 3000's.
post #142 of 264
Thread Starter 
Quote:
Originally Posted by noah katz View Post

Just noticed your question about bridging the ipr 3000; the answer is yes, it can be.

The 6000/7500 cannot be, as they're essentially a pair of bridged 3000's.

yeah, I noticed it on another forum after a lot of digging. it's just not advertised as such "in the manual" type of thing from what I could gather.
post #143 of 264
post #144 of 264
Thread Starter 
???? ^^^^^^^^^^
post #145 of 264
Thread Starter 
well, looks like my amp searching is over. picking up an IPR 3000 + minidsp 2x4 (unbalanced) for $330 for the pair from a member here... can't beat that right now. should do me good for 2 subs biggrin.gif
post #146 of 264
that's a pretty good price. congrats.
post #147 of 264
Thread Starter 
Quote:
Originally Posted by LTD02 View Post

that's a pretty good price. congrats.

lol, yeah it's nice to finally stop looking and looking and looking and scratching my head going "which ONE!!!" lol. now to get ahold of Nick on Monday and order a couple SI 18s
post #148 of 264
Be aware that the miniDSP 2x4 unbalanced only puts out 0.9 Volts RMS maximum, which is not enough to drive the majority of power amps to full power.
post #149 of 264
Thread Starter 
Quote:
Originally Posted by andyc56 View Post

Be aware that the miniDSP 2x4 unbalanced only puts out 0.9 Volts RMS maximum, which is not enough to drive the majority of power amps to full power.

x fingers, the member who sold it to me said the reason he used the unbalanced with his IPR 3000 was because the IPR was a 0.775 v input sensitivity for full output and the 0.9 v was enough... if not I guess I'll have to look at a clean box
post #150 of 264
Quote:
Originally Posted by wormraper View Post

Quote:
Originally Posted by andyc56 View Post

Be aware that the miniDSP 2x4 unbalanced only puts out 0.9 Volts RMS maximum, which is not enough to drive the majority of power amps to full power.

x fingers, the member who sold it to me said the reason he used the unbalanced with his IPR 3000 was because the IPR was a 0.775 v input sensitivity for full output and the 0.9 v was enough... if not I guess I'll have to look at a clean box

Ahh, I just looked that up, and sure enough that's right! That's one of the lowest input sensitivity numbers I've seen in a while.
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