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Brian Steele

Yeah, ground plane measurements work out pretty well when done correctly. From the image, the only thing I'd change (if that was a ground plane measurement) would be to orient the box vertically instead of horizontally and lean it so that the top of the box was the same distance from the mic as the ...

Brian Steele

shake d livin wake d dead wrote:
kavaninho wrote:^ That is not ideal at all.

Nope its not...when we went out in the open, the correct thing was done

Actually, if you were doing what's called a "ground plane" measurement, it can be quite accurate.

Brian Steele

For the "final adjustment" (is there ever such a thing, LOL), I use REW and a good microphone. That's how I found out that decreasing the the delay on the subwoofers improved the output at midbass frequencies (80~200 Hz). I might still have a bit more adjustment to do as I noticed that the...

Brian Steele

Wow, 70 views and no answers yet.... :-) Well, I discovered recently that doing it just by distance measurement alone is probably not going to produce optimum results. That should be the starting point, after which reducing the delay (increasing the "distance" setting in the DSP). and look...

Brian Steele

What techniques do you use for time aligning your subwoofers with your midbass speakers in your car? Do you just do a physical measurement and plug those dimensions into your DSP, or do you do something else?

Brian Steele

"A British Audiophile" is one of the better Youtubers out there. I came across his channel several months ago.

Brian Steele

Wow, US$100 for a 2" driver.... This Tang-Band driver is a 2" driver with extended response and decent advertised efficiency. For $31 for Parts Express I'd be tempted to give it a shot if I was in the market for a 2" driver. And there are many more there on the PE site that might be o...

Brian Steele

Firewall wrote:Any ideas on the easiest/quickest way to do this is appreciated. Thinking dremel with cut off disc, or tin snips (if i could find them)

Depends on how much you have to remove. A Dremel with a grinder bit or even an ordinary electric drill with a grinding wheel may be all you need.

Brian Steele

I used to build my door speaker adapters out of wood - until I discovered what moisture does to them. Now I use a plastic wood substitute called "starboard" that's available from most marine stores. It's a bit expensive and will likely have to be screwed in place because most glues can't s...

Brian Steele

I'm guessing that since it's a van involved, there is probably no chance of someone being in the back seat, as there's no back seat

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Brian Steele

From the Orion HCCA manual... "Please Note: Due to the extremely long excursion and high temperature possibilities of this woofer, it is recommended that when the woofer is installed it be positioned so that the cone either faces upward or downward only." Jus sayin; :-) Looks like that bui...

Brian Steele

I installed my Alpine PDX-F6 in a similar way. I oriented it so that the wires faced towards the front of the car though, Not only did that ensure that they wouldn't be disturbed by an errant foot from someone sitting in the back seat, the glow from the amps was a bit more visible and gives my other...

Brian Steele

I see those A pillar speaker pod thingies are very popular. I wonder how they deal with the diffraction issue though? Placing a driver in a circular baffle (in this case, a baffle that's slightly wider than the driver itself) can result in huge diffraction issues.

Brian Steele

COVID-19

Everything's slow

Brian Steele

4.5 cu.ft.? That's about the gross size of my POC3 TH. But that uses 1 12" driver and 1200 rms will be way too much for it. If you're look for decent outdoor SPL, two pro audio 12" drivers (that are suitable for this purpose) in a ~40 Hz vented or MLTL box that size should give some pretty...

Brian Steele

Depends on how silly you want to get and how much space you want to give up. Tapped horns using 15" or at 18" drivers for example will take up a bit of space, but get pretty loud if you give them enough power.

Brian Steele

I did not even know people use point 3 above as an approach. I guess if you have capable DSP you can. IMO usually the more EQ and "DSP capability" you require after your system was built indicates poor decisions in the earlier stages whether it be driver selection or system design. That a...

Brian Steele

Oh boy, where to start. 1. Efficiency at low frequencies is largely a function of box size and tuning 2. WinISD is an inaccurate modeler for car audio designs. It does not take "cabin gain" into effect. Nor does it accurately model the effect of Le, or the effect of "semi-inductance&q...

Brian Steele

Building them in China isn't an issue. Quality control is the issue. Like when someone orders a subwoofer driver of specs A, the manufacturer sends a sample that matches the specs, and then when the buyer orders in quantity, what is received are subwoofer drivers that look like the sample but are en...

Brian Steele

passive radiator? Nope. A passively-assisted sealed alignment is basically a sealed design with a large capacitor in series with the woofer. Choose the value of the capacitor right, and you can end up with a nice boost at low frequencies. It can also help to reduce the "boom" of a high-Q ...

Brian Steele

Note that subwoofer efficiency at low frequencies is primarily a function of box size. Peak SPL at those frequencies will depend on the driver's excursion and power handling capabilities, how much power you have on tap and of course what sort of "cabin gain" you get in your car. Given your...

Brian Steele

What subwoofer drivers are those?

Brian Steele

Not only is the port length too long, but a 2" vent is too small for a 12" car audio woofer. The minimum I'd use is a 4" vent (or if pushed, a 3" properly-flared vent) for a 12" car audio woofer.

Brian Steele

I won't spend that much on a deck either. All I need in my case is something like the 80PRS with better BT (support for v5, for example), because that's primarily the way I play music these days. (using Deezer and cached music on my phone). "Nice to haves" would be parametric EQ (like what...

Brian Steele

An example - https://www.sonicelectronix.com/item-175621-Pioneer-MVH-S720BHS.html That deck has better tuning capabilities than the 80PRS, particularly if you use the phone app with it. What it does not have is auto-tuning (which I must've used once, LOL) and a CD-player. Unfortunately its BT is v4....

Brian Steele

The 80PRS is a fine deck, but is somewhat dated. Pioneer has several decks that offer similar if not identical features at a lower cost. And if your source of music is your phone or thumb drive, have a look at one of the "media receivers" as an alternative. The newer decks will support lat...

Brian Steele

V3 has detachable leads (and USB cable), a built-in resistor for re-calibration purposes, and can do measurements at different voltage levels. It's built more like a lab device. It's a nice piece of kit, but if you've got a working V2, I'm not sure it's worth the cost of the upgrade, unless you real...

Brian Steele

If you really want to try something different, have a look at passively-assisted sealed alignments. Basically you take a sealed Q~1.0 enclosure and put a good deal of capacitance in series with it. End result is a frequency response that's close to vented, without the vent. Box is small though, so y...

Brian Steele

I think to get the best results, you may need to tune the "vent" to the Fb of the driver in the box (sealed), and then stuff the vent until the impedance curve is as flat as possible. Or something like that. Easier to do with DATS or an impedance measuring jig that you can use with REW. Oh...