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    Heide264's Avatar
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    bandpass box downsides

    I have been curious for a while, what ever happened to bandpass boxes and why? I have an old (ballpark 20yr) rockford fosgate dual 8" bandpass enclosure with an equally old 300W USA amp on it and it sounds very good normally and for 300W it is all the power I really need.

    I was just wondering what most the big downsides of the bandpass enclosures are and why not many people use them anymore.







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    Re: bandpass box downsides

    people to cheap to have a good box built!




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    Re: bandpass box downsides

    Well, when the box was built there wasn't much better out there. The build is great and its still up and pumping 20 years later. I wish I had some form of literature on it though - not even rockford has a spec sheet or manual for it anymore.

    I was honestly just curious why they aren't used much.




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    Re: bandpass box downsides

    i dont know but im fixing to do one in my m3 vert.




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    Re: bandpass box downsides

    My last build consisted of 6 12s in a 4th order bandpass. It was by far one of the loudest and cleanest sounding setups I have had. My current one is going to be 4 12s in a 6th order bandpass.

    So I'm pretty stuck on bandpass enclosures. After doing a proper one I will never go back to generic bass reflex.



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    Quote Originally Posted by PV Audio View Post
    It will never be proved that loudness is somehow related to SPL because it isn't.

    Loudness, a subjective measure, is often confused with objective measures of sound pressure such as decibels or sound intensity.
    Quote Originally Posted by Pete Kulicki
    Building a stereo just to measure it's sound pressure level is like building a microwave oven for no reason other than to measure it's electromagnetic radiation emissions.

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    Re: bandpass box downsides

    the thing about em is they have to be built right or you have ****** fq response



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    Re: bandpass box downsides

    Somewhere along the line someone said "ZOMG IF YOU DONT BUILD IT TO WITHIN .0000000000000000000001 CUBIC FEET OF WHERE IT NEEDS TO BE IT WONT MAKE A SOUND AND IT WILL BLOW YOUR SUBWOOFAZ DONT RISK IT!!!".

    They really arent that hard. A 4th order is pretty easy to design. Its just like any other box, with a bad design it wont perform well. But people make it sound like it will be the end of the world if you dont design it correctly. It wont be. Experiment with a couple boxes, wood isnt that expensive.

    I just tore my box apart, was a 4th order for 24 15s. Ive designed and built a couple bandpasses for some 10s/12s/15s and they are always impressive for what they are.




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    Re: bandpass box downsides

    Thanks, was just curious.

    I've heard that it is impossible to tell when you are pushing the drivers too hard with a bandpass box also, is there any truth to that?

    I have no idea how much power this old box and its drivers can take. They are old punch drivers that I recently refoamed. Its being driven by a USA150 in bridged so supposedly 300W.

    Think I am in the safe zone to set my amp gain to its correct level? Right now its down a bit just to be on the safe side since I don't normally push it too hard. I can't find spec sheets for it anywhere; not even R.F. has any on file.




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    ciaonzo's Avatar
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    Re: bandpass box downsides

    Bandpass enclosures are solely for efficiency. The group delay is horrible and the response is usually peaky. Other than that, they're good for getting loud.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

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    Re: bandpass box downsides

    Quote Originally Posted by ciaonzo View Post
    Bandpass enclosures are solely for efficiency. The group delay is horrible and the response is usually peaky. Other than that, they're good for getting loud.
    You should have heard mine. If you design it right they can sound amazing.




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    Re: bandpass box downsides

    Ya. Whoever decided to say, "it can't be a 16th off or it will sound like ****", is a feg. I was probably an 1/8th off on everything and it still hammered daily.



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    Quote Originally Posted by PV Audio View Post
    It will never be proved that loudness is somehow related to SPL because it isn't.

    Loudness, a subjective measure, is often confused with objective measures of sound pressure such as decibels or sound intensity.
    Quote Originally Posted by Pete Kulicki
    Building a stereo just to measure it's sound pressure level is like building a microwave oven for no reason other than to measure it's electromagnetic radiation emissions.

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    ciaonzo's Avatar
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    Re: bandpass box downsides

    Quote Originally Posted by galacticmonkey View Post
    You should have heard mine. If you design it right they can sound amazing.
    Indeed, I thought yours sounded great. At least from what I could tell from the vids. I have designed some greats as well but they never compare to the transient perfect enclosures as far as SQ is concerned. They have their purpose, no doubt.



    Quote Originally Posted by audioholic View Post
    Saying "clipping doesn't kill speakers" is a half-truth at best. Technically no, clipping itself does not hurt the speaker. But in clipping your amp, you can easily create a situation that WILL kill the speaker. Was the squared waveform the DIRECT cause of the failure? No. In the end, the answer is, always has been, and can only be... heat kills speakers. BUT, clipping increases heat generation, sometimes by a drastic amount. So to start a thread simply to state that clipping does not hurt speakers is, again, a half-truth at best.

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    Re: bandpass box downsides

    Transient response is lacking. Other than that they can be made to sound very well, but compared to ported, bandpass has a higher group delay, especially if doing a 6th order.



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    Re: bandpass box downsides

    Can somebody give me a quick run down on group delay? I have heard the term thrown around a bit and just curious as to what it actually is. Not a pro here by any means.

    I've never used anything other than that box that I bought off my father for $20 since he was planning on junking it... Might have to try a standard sealed/ported one once I'm outta school and not eating ramen noodles.




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