Found an SVT410HE

[SurferJoe46]

I found an SVT410HE in a yard sale that was getting set up for the weekend and snatched it up for $100.00.

Unblemished and even in the original box. The guy sold it to pay the rent that his buddy left him stuck with - and a lot of his other gear. I only had the $100.00 with me and he wouldn't take a check or a credit card. Bad sport.

I'll get a pix of it soon - or as soon as I get it home - I only had my Isuzu Amigo and it was already loaded with things.

I Googled the cab and need to know about a discrepancy I noticed though:

LF Drivers: 4 x 10”
Voice Coil: 2”
Magnet Weight (each): 30 oz
HF Drivers: Horn/Driver
Voice Coil: 1”
Magnet Weight (each): 8 oz
RMS Power Handling: 500-Watts
Frequency Response (-3dB): 60Hz-18kHz
Usable Low Frequency (-10dB): 43Hz
Nominal Impedance: 8-Ohms
Sensitivity: 98dB
Maximum SPL: 122dB
Dimensions (W x H x D inches): 24 x 25 x 16
Weight: 91 Pounds

Why is the freq response different from "Usable"? Either it CAN or it CAN NOT go that low.

Where'd the extra 17HZ go!?!

[Implosion]

A 3 dB drop in sound pressure level goes within the range of "normal" and therefore "usable". 10dB drop is considered to be the maximum drop that can still be considered to be somewhat of usable. The dB drop between the frequencies 43-60 Hz is somewhere between 3 and 10 dB (the dB drop increases as the frequency goes lower). But you really shouldn't look at the numbers too much. An actual SPL-chart would tell the whole truth and nothing but the truth, but 99.5% of manufacturers don't release those charts because the truth can hurt.

[tom once dead]

just bought one of these today myself. Awesome sounding cab.

[SurferJoe46]

Very Interesting.

The dB drop --- is that (pardon my ignorance here) from the negative side of the Doppler-Wave effect?

It sounds like this is a pressure/vacuum wave condition and is that the same pressure one feels from the impact on your chest with a really powerful volume setting?

[Implosion]

Originally Posted by SurferJoe46

Very Interesting.

The dB drop --- is that (pardon my ignorance here) from the negative side of the Doppler-Wave effect?

It sounds like this is a pressure/vacuum wave condition and is that the same pressure one feels from the impact on your chest with a really powerful volume setting?

I might be losing something on the translation because I'm not sure what you mean with the Doppler wave. The doppler effect is about the percieved frequency when the either the observer, the source or both are in motion. Decibel (dB) is the the (logarithmic and dimensionless) unit that is used for sound pressure level.

I'm not sure if I answered your question though.

[SurferJoe46]

I'm probably not asking it correctly either.

But you seem to have homed-in on my question by telling me that there is a unit called decibels that are measured and can be expressed as sound pressure waves.

Doppler waves were, as I can see now - in a misguided way what I perceived as the full wave or the cumulative positive side and the negative side of a full wave.

I was mistakenly trying to equate the pressure one feels from loud sounds with dB's and I see that's wrong now.

[Implosion]

Originally Posted by SurferJoe46

I was mistakenly trying to equate the pressure one feels from loud sounds with dB's and I see that's wrong now.

You are only slightly mistaken with these things. The root of confusion is sound pressure vs sound pressure level. Sound pressure is measured is pascals (psi in the imperial system) and decibels are used to describe the difference of sound pressure level in regard to a reference value. Not sure if that came out right in English, not being a native speaker and all.

[chiplexic]

If the tone makes you happy that's all that matters. You own it for a great price. Many have said this cab is best suited to use with a second cab such as a 15" under it. So that spec showing weak low end is somewhat true to it's actual tone. As they say, manufacturers most often juice up or leave out true spec numbers. So your ears will be the true test.

[SurferJoe46]

Originally Posted by Implosion

You are only slightly mistaken with these things. The root of confusion is sound pressure vs sound pressure level. Sound pressure is measured is pascals (psi in the imperial system) and decibels are used to describe the difference of sound pressure level in regard to a reference value. Not sure if that came out right in English, not being a native speaker and all.

I wasn't ignoring your last response - it was after 1AM here (01:10) and I finally had to get some sleep.

The info was great as I never knew that sound pressure was actually measurable in pounds-per-square-inch values.

Where or how is the dB base level reference setting established?