- #Response peak unibox drivers
- #Response peak unibox driver
- #Response peak unibox pro
- #Response peak unibox software
Mcylinder - I think you are right, the manufacturer was probably optimistic about the xmax of the driver (it is a Blueprint 1001, not available anymore). The PR is a 15" unit with 31mm of one way throw. Jason - I'm using a 10" driver whith 16.5mm of one way throw (according to the manufacturer). I'm going to solve my problem by simply buying a larger driver that I know my amp cannot push to its limit, then adjust the mass of my PR to get the response I want. so are you using the equivalently tuned port? The freeware ISD doesn't model PR specificly. I just adjusted the power until there was a frequency at which the driver reaches its xmax.
#Response peak unibox pro
In both WinISD pro and unibox the excursion chart is for a given level of power.
#Response peak unibox software
Perhaps the software you're using is providing averaged excursion on it's xmax graph, instead of peak. If you're putting say, 100 watts RMS into the driver, that means that you're hitting voltage and hence excursion peaks above and below that nominal level. there's a difference between steady state and peak analysis. I should have said that I'm doing this on the cheap, so I'm looking for freeware.Īs far as hitting xmax.
This is not a frequency response versus input per se, but a maximum output capability of the speaker and cabinet combination at maximum Xmax.I've heard really good things about In your case though, I'd just advise picking up a book and a copy of excel and working through the math yourself. The light gray trace is the maximum SPL that can be produced (anehoic) by this cabinet, driver and port combination when driven to 10 mm excursion. The lower green-blue trace is the estimated output due to leaks. The upper light blue plot trace is the SPL produced by the port. At the box tuning, most of the output is coming from the port- one reason why you DON'T want to cheese out on the port diameter and impair the clean output capability. The thin black line with the dip at box tuning is the SPL produced by the driver in this box with 100W drive. The Red line is the maximum SPL that can be produced directly by the driver with 10 mm peak excursion. This is why this system is designed and tuned with a drop off toward lower frequencies, with lower Q, so that the transient response is tighter and the in room balance with proper placement will be perceived as relatively flat, not as bass heavy. In the room, this is modified by near by boundary placement, and in the lower frequencies may reach a level 6 dB or more higher. The dark blue is the anchoic SPL output for the combined port and speaker with 100W drive. The Legend describes the outputs for each colored trace. Let's look at this one, done in Unibox 3 for an Aurasound NS12 woofer in a 75 liter box. There are several versions of Unibox, and you won't always see the same data in the combined plots. The black line just below it that dips at the box tuning frequency is the driver excursion for that power level of drive- at the Fb, the box/port combination reduces the driver excursion substantially. the redline is the driver output vs frequency, for just the driver. That said you need to remember these are anechoic sims, not how things are going to happen in-room once room-gain is taken into account Yes in theory we want to keep the black driver output line below the red line. These aren't hard limits, but good guidelines.Īgain, use the export feature to save your graphs and then attach them. You'll find it can be quite the balancing act sometimes. make sure you port doesn't exceed say 25 - 35m/s, and make sure the first port resonance is above say 200hz. then you need to check your port velocity and resonance. You want to have enough volume to get a nice flat response, but maybe with a little gentle roll off to allow room gain to fill in. Its a gamble that I'm taking, but I can afford to replace my drivers.Īs far as if there is a science, yes. You just really have to pay attention to the limits of the sub. It may get riskier as more movies have that low freq. We do this out of the belief that we have soooo much sub, and that the tuning point is so low, that there just isn't going to be much signal in that range.
#Response peak unibox drivers
Many of us are willing to risk our drivers and go without the highpass filters. (YET, Thomas and Chuck are going to have one very soon.- reportedly) However, the rub is that there aren't any good diy high pass filters out there. A high pass will filter out and roll the signal off to protect the sub from exceeding it's excursion limits. It is also why a high-pass filter is highly recommended for a ported sub. This is just the nature of the beast with a vented sub. It is near impossible to not have the cone exceed the xmax below the tuning point. You're probably modeling it correctly, but post the graph for us to take a look at to make sure.