Excel PCD 7 Question

[Patches9412]

Ive just started learning (the excel passive xo designer) but ive come to a standstill. It states in the Instructions that i need to import frequency and impedance data (FRD/ZMA files). Do i have to measure this myself and import it in (something i currently do not have the means of doing)? Or can i get this info otherwise.

The Drivers im modeling are
2X Hivi M8Ns
2X Hivi M5Ns
1X Hivi RT1.3

If i were to make measure the speakers myself could i do that with a normal MAudio firewire interface?

Hank

[MSaturn]

The measurements you'll need for the RT1.3 and M5a are as follows:

http://www.zaphaudio.com/temp/Hi-Vi_RT1.3-FR.gif

http://www.zaphaudio.com/5.5test/Hivi-M5a-FR.gif

The m8n/a can be found here. (http://www.audioheuristics.org/measurements/Testing/Woofer2/8%20inch%20woofer%20test.htm) Be sure to mind the sensitivity.

You'll need SPLTrace, a free program. Search for it on google. It will allow you to create .frd and .zma files.

Note:

Be careful about using the RT 1.3 too low. 3Khz should be your lower limit, and be sure to cross steep (fourth-order LR). An MTM arrangement of your midwoofers should mitigate dispersion problems caused by a high crossover.

[Wolf]

You can simulate the FR curves in the Response Modeler (the companion spreadsheet!), as well as the impedance curves. OR you can trace the curves with SPLcopy or SPLtrace.

Be advised there are varying ways to measure raw driver data, and you want infinite-baffle measurements. You then alter these traced/copied files with RM to suit your application for your boxes and driver layout, and then import into PCD. Enter your offsets, match your curves, and tweak.

If you want some more tips, I have a reasonable layout foretold in my blog how to get started to create your files and how to initially setup your simulation. The 'Bible' at the top of the forum will really help you find all the info you desire.

I also have all the *raw* driver data files you requested. You will need to adapt them to your application before you can use them in PCD as they are. Shoot me a PM with your e-mail, and I can send you the raw data files.

One point about the drivers listed- the RT1.3 and the M5N transition could be difficult. They may barely make that cut...

With ARTA or HOLM Impulse, you can measure your .frd and .zma files, as long as you have a mic with it's corresponding cal file, a full-duplex high-sampling soundcard either internal or like the MAudio FireWire Solo, and an amp with enough gain to achieve the measurement output requirement.

Later,
Wolf

[Wolf]

Be careful about using the RT 1.3 too low. 3Khz should be your lower limit, and be sure to cross steep (fourth-order LR)..

The advertised spec is 2.5k+, but I feel it's better from 2.8K+ so I agree with your recommendation of xover point. I also feel you should use a 4th electrical network on it, which usually results in an LR6 acoustic slope. I xovered LR6@3k, and it shows no sign of stress.
Later,
Wolf

[Patches9412]

You two are always to my rescue, Thanks for the tips. I had panned for a 3000hz ox point for the tweet, so i think we will be pretty good. Wolf, i sent you a PM.

Hank

[Wolf]

You two are always to my rescue, Thanks for the tips. I had panned for a 3000hz ox point for the tweet, so i think we will be pretty good. Wolf, i sent you a PM.

Hank

On their way!
You should probably shoot for a 200-400 Hz xover for the mid to woofer xover point.
Later,
Wolf