Leaderboard

Man, I'm not trying to be an ass here, I promise! But you are about to ask the manufacturer if that size works well, when they recommended it in the first place. What exactly are you expecting them to tell you? If you want to know how good they sound in a particular size enclosure then you HAVE to consider the port, other wise the comparison is pointless. I'm just trying to help you out here. I can read very well but you are just not considering everything you need to consider. However, I will stop trying to help, I apologize for taking time to help you.

DC recommends 1.25. What's the confusion then?

I would ask dc and see if they can offer insight.

Bro. Dude. My man. You've replied 5 times to this thread and haven't offered any type of insight or information pertaining to the topic. Im not asking about ports. I know very much about ports. I'm not asking about vehicle types. Im aware different vehicles sound different. I'm asking about a particular 12" sub in a 1.25 cubic foot enclosure. That is much smaller than what other 12" subs perform well in. Is 1.25 really the best size for this sub? Why do they recommend this size? What is it about this sub that makes them recommend that size of an enclosure? Nothing about ports. You've replied to my questions with other questions.

Yes and I want to ask them how they sounded

A two way passive crossover as an example separates the low frequency audio and the high frequency audio. It does so by placing magic resistors in line with the tweeters and with the woofers. The magic is that these resistors change resistance (impedance) with frequency. For the tweeter we use a magic resistor that gets higher in impedance as the frequency decreases. At 10kHz this resistor might be 0 ohms, at 5kHz it might be 1 ohms, and at 2.5kHz it might be 4 ohms and at 1.25kHz it is 12 ohms, at 612Hz it is 48 ohms; and so on. If we are using a 4 ohm tweeter and the magic resistor hits 4 ohms at 2.5kHz, this means only half of the power will be going to the tweeter at 2.5kHz vs when the magic resistor isn't active. This half power point is called the -3dB point or the crossover point. Also notice that as the frequency halves, the impedance of the magic resistor goes up by 4x. This indicates a 6dB per octave crossover. In a 12dB per octave crossover the magic resistor goes up by 16x per frequency half. The same thing happens with the woofer, but the magic resistors used for this work the other way. As frequency goes up by 2x, the impedance goes up by 4x. (6db per octave). So with our 2 way component set lets do an example of what happens with impedance vs freq. We will use a 2kHz crossover point and a 12dB per octave crossover for high and low pass. We will also use 4 ohm woofers and tweeters. We are going to ignore impedance rise of the drivers themselves for this example. This will demonstrate how a properly designed component set can maintain 4 ohms at any frequency even. Frequency Impedance of Woofer + magic R Impedance of Tweeter + magic R Parallel impedance (what amp sees) ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- 31 Hz 4 ohms 12 Mohm 4 ohms 63 Hz 4 ohms 1 Mohm 4 ohms 125 Hz 4 ohms 84 kohms 4 ohms 250 Hz 4 ohms 6916 ohms 4 ohms 500 Hz 4 ohms 580 ohms 4 ohms 1 kHz 4.3 ohms 52 ohms 4 ohms 2 kHz 8 ohms 8 ohms 4 ohms 4 kHz 52 ohms 4.3 ohms 4 ohms 8 kHz 580 ohms 4 ohms 4 ohms 16 kHz 6916 ohms 4 ohms 4 ohms This magic resistor is made from capacitors and inductors; and sometimes resistors too. So as to how this relates to the AMM-1, it depends if you are trying to measure the actual power going to one of the speakers in the component set, or if you are trying to measure the amplifier output into the complete component set.

A little sanding around the outer edges, and here is a much nicer looking product. Tomorrow I will make the second one. Tonight, I am done. Too late to use power tools anymore