Subwoofer frequencies

[Urban_Squrill]

I was wondering what frequencies really have the most rattling power(low ones?). And how would I go about creating them?

[jmebonner]

The very low. I believe it's about 20 or 30 hertz where it drops out of humans' ability to hear.
As far as creating them, you mean like with a good box, or actually creating them w/ some music program?

[Urban_Squrill]

Creating the sounds in like sound forge or something.

Also I am wondering on the wattage of this old reciver I have in my garage. harman kardon 430.

[jmebonner]

Beats me :? I do know that you should space the hits out though, because when you get too many lows together too close, it sounds muddy or distorted.

G/L!

[Urban_Squrill]

Thankz!
Anyone have idea's on making those?

Actually, to make low hits defined, instead of spacing them out, you add mids and highs to the hit. It's a classic newbie mistake for running sound to cut all the highs and mids out of a bass drum. I mean, who wants highs in a bass drum hit? But trust me.

As for rattling things, it's more of what the things you're trying to rattle are tuned to. Everything has a sympathetic vibration frequency. Otherwise the only real key to rattling things is volume.

Info on the HK430:

HK-430:

Amplifier Section:
Power Output: 25 Watts min. RMS per Channel,both channels driven into 8ohms from 20Hz to 20 kHz, with less than 0.3% THD

Power Bandwidth:From 10Hz to 40Hz at less than 0.3% THD into 8 ohms, both channels driven simultaneously at 12.5 watts per channel.

Frequency Band width:From 4Hz to beyond 140 kHz

Frequency Response:20Hz to 20kHz + - 0.5dB

Square Wave Rise Time:Less than 3 microseconds

Square Wave Tilt:Less than 5% at 20Hz

Total Harmonic Distortion:Less than 0.3% from 250 milliwatts to 25 watts RMS, both channels driven simultaneously into 8 ohms from 20Hz to 20kHz

Intermodulation Distortion:Less than 0.15% at rated power output.

System Hum and Noise:Better than 65dB below rated output(unweighted)

Damping Factor:40

Tuner Section:
Capture Ratio:2.5dB

Image Rejection:60dB

Spurious Response Rejection:50dB

Alternate Channel Selectivity:60dB

T.H.D.:0.6% Mono
0.7% Stereo

[Urban_Squrill]

Holy crap you found it thankz. So with that reciver what does that turn into in terms of watts per channel max? I am really just looking for some good rattling and low frequencies.

[MaxVal]

You might download and try the program available here.

http://www.marchandelec.com/fg.htm

It can generate several waveforms across the audio spectrum.
Start off at low volume, as it is possible to damage components!

[Urban_Squrill]

Thankz I will try it and tell ya what I think.