Amp and Sub, enough headroom?

power wise......i am sure you will be OK...

But a quick look at the specs makes me have the opinion of "steer clear"....

The idea behind a bandpass enclosure is too increase gain of said woofer... This enclosure and sub combo has a sensitivity of 89 Db....that is low...really low..... I personally would look elsewhere...just my 2 cents.

 

If it were me...I would either get a bandpass enclosure from a reputable manufacturer of speakers pre made...or get a quality sub and have the enclosure designed and built by a reputable shop... some woofers will work well in a bandpass...others will not....keep that in mind also. I cant sit here and tell you all that will and wont...but I along with a few others on here have some nice software to help you..just give me a list (short) of what you might be looking at for woofers....And the higher the snesitivity the better (the higher the number the louder it will get)

 

Sorry, but sensitivity has nothing to do with how loud a speaker will play. Sensitivity is measurement of SPL at a given power level, but it doesn't determine the driver's maximum output level.

Sensitivity of speakers is measured by placing a microphone 1 meter away from a speaker and playing a tone using 1 watt of power. The rating is how many decibels is reached.

An increased rating of 3dB translates into requiring half the power to achieve the same level. So conversely, a 3dB decrease means you'll need double the power.

So, if an 89dB speaker needed 200 watts to reach 100dB, then a 95dB speaker would require only 50 watts.

Again, I will refer to home audio. A Klipschorn loudspeaker is one of the most efficient designs made, a folded exponential horn. These speakers contain a 15" woofer and can reach about 110dB with one watt. It takes only 20 watts to power this speaker to concert levels.

A bandpass enclosure is so designed to create a natural filtering of upper frequencies, so mostly only lower frequencies are produced. This is why it's called a "band pass": It allows a band (restricted range) of lower frequencies to pass. With the band restricted to a more narrow range, the output is increased.

 

Take 2 drivers....One with a sensitivity of 90 dB, the other 93 dB.... Both rated at say 100watts. Put each in the same type of optimized enclosure and in the same enviorment. Drive them both with 100 watts.....guess what? the driver with the higher sensitivity will get louder...period. Now I am not going to get into discplacement limited power handling and its effect on drivers, eveen though this is a a critical part of driver selection for the available box size.

I always encourage folks to go with a driver with higher sensitivity ratings for the simple fact that it takes less power to get loud. And in critical listening allows for slightly greater dynamic range....


I am VERY familiar with Klipsch..Used to impress folks with them by driving them with an old walkman...My old shop sold them.

A bandpass enclosure is designed bassically as you stated, I never claimed any different, nor did I expand upon its design, mainly due to the fact that it is beyond the scope of many peoples understanding of how a driver interacts with its enviorment. What I was trying to indicate to the original poster was some key things to look for with the power he had availible to him.

Bandpass enclosures were one of my primary studies back in my day. built many SPL vehicles based on very efficient designs of my own design. (and set a few records mind you, although they didnt last long! LOL!) You seem to know a thing or two about them. Perhaps we could exchange ideas and thoughts on them down the road...

 

I don't think so. A direct quote from V Dickasons book (you've been an installer foe 30 years, you should know who he is), "the loudness produced by a given amount of amplifier power is a direct function of the efficiency of the loudspeaker and the volume of air it is trying to excite." In other words, given the same amplifier power, the more efficient speaker will be louder.

Your assumption of why the bandpass enclosure is louder is incorrect. Its louder beause of increased efficiency. Recall that the tuned chamber part is considered to be an acoustic filter in series with the front radiation of the driver.

Define exponential please so that I may properly respond to that part of you post. I understand what an exponential function is and what it looks like and how it behaves, does the horn cross sectional area increase in size exponentially. If so at what rate. Please define it as a function f(x)= ab raised to the power of x

 

And once AGAIN...THE ORIGINAL POST states he has an amp with 200 watts availible to him.....Not 1000, not 5000, not 10000 watts... In lower powered systems driver sensitivity and box design become more critical in acheiving a desired SPL. You have 30 years under your belt, you should know that by now.

 

You have a grasp on something no doubt.....


I by no means know it all...And unless you have a written publication that is studied and scrutinized and held as a basis for loudspeaker theory and interaction in a variety of enviorments...I suggest you find another site to portray your "educated by 30 years" of "facts"


you are walking a thin line here....but I am sure you wont care about that.