Yet another amp question...

[FirebirdHatesRice]

This is just a quick question for all of you pro's out there. I've got my gain adjusted perfectly on the amp, but I noticed that there are two other controls. One for "Equalizer" and another for "Frequency" The manual really doesn't say much about why these would be adjusted, it only got into detail on the gain. Do you guys know what these two things control, and if I should adjust them?

Heres what the manual says:

Thunder EQ – This equalization circuit is used to enhance the low frequency response of the vehicle’s interior. With up to 18dB of boost and centered at 40Hz, the Bass EQ can be adjusted to meet your own personal taste.

Frequency Control – This control is continuously adjustable from 40Hz through 200Hz at 24dB per
octave. Factory setting is at 40Hz.

Thanks again,
Brent

[96firebird311]

Sounds like a variable bass boost to me. Nothing unusual. The "Equalizer" knob adds a little larger bump at the frequency set by the "Frequency" knob. You should be setting your gain with the Equlaizer knob set to 0. Justa note for ya. ;)

[Freeser]

Ok the 18dbs of boost is your bass boost (which should be set at zero when setting gains), this allows you to "bump it up a little" don' tget too carried away though. The bass boost should be set no higher than 3-4, but 0 is perfectly fine. Centered at 40 hz means thats where your sub frequency is at its peak spl level, on my amp the center frequency is ajustable, i don't know if yours is adjustable or not? As for your frequecy control that sounds like your low pass filter. When setting your low pass filter set it at 80hz and work your way down to get the sound you like, the lower you go the less midbass frequencies your sub hits.

Matt

[Vyse]

Thunder EQ- That's your bass boost. The frequency it boosts is fixed at 40Hz. 0-18dB of adjustment.

Frequency- Adjusts your amplifiers crossover. I'll guess that it's a low pass? You can select the crossover point anywhere from 40-200 Hz. For a subwoofer I would recommend 60Hz. Keep it in the area of 100Hz to 50Hz and you'll be cooking. [img]graemlins/banana.gif[/img]

[96firebird311]

You know.... I first figured the "Frequency" knob was just the Lp filter, but then he said the factory setting was 40Hz... nobody runs a LP filter at 40Hz...

Next, the "Equalizer" knob doesn't specify a rolloff. So that made me think. Maybe the "Frequency" knob just makes it a variable bass boost since it has a rolloff specified, although 24db ia pretty damn steep for a bass boost....hmmmm

Here's your answer, does the amp have yet ANOTHER knob for the LP filter? If not, then the "Frequncy" knob is it. No amp has a variable bass boost and no LP filter. ;)

[Freeser]

Yeah 311 I thought it was the center frequency also but I had a look at the owners manual and it only has 3 knobs (gain, eq, frequency) so I'm pretty sure its his LPF, which should never be set as low as 40hz.

Matt

[FirebirdHatesRice]

Originally posted by Freeser:
Yeah 311 I thought it was the center frequency also but I had a look at the owners manual and it only has 3 knobs (gain, eq, frequency) so I'm pretty sure its his LPF, which should never be set as low as 40hz.

Matt

So what would be a be a good location to set the filter? Right now its turned about 1/4 of the way up. It's a bit difficult, because there aren't any numbers, you just turn the knob clockwise for up, counter clockwise for down. It's all basically guess and check.

[96firebird311]

There has got to be something to go off of. Does it have just a number on min setting and a number on the max setting? And just no numbers in between? Check the owners manual. There has got to be some numbers somewhere. 80Hz is about the norm.

[Tarball]

Thats how my amp is also. No numbers on the dials so I'm not sure where I'm setting it. Its on a MTX8302. Let me know if you find a good position for those knobs.

[FirebirdHatesRice]

Frequency Control – This control is continuously adjustable from 40Hz through 200Hz at 24dB per
octave. Factory setting is at 40Hz.

There are no numbers, other than the minimum is 40Hz, maximum is 200Hz. The dial itself has no numbers on it, so you basically just have to guess.

[96firebird311]

I'd just turn it up about 1/4 of the way. Should be pretty close. It doesn't have to be exact. Listen to it. If you feel it's playing too much midbass, turn it back a bit. Not enough, turn it up....

[Vyse]

There is nothing wrong with a 40Hz crossover point, unless you are a bass-head. I use 60Hz at 24dB per octave. If all that your system is made for is bass, then 80Hz or 90Hz is what you need.

[Freeser]

If you are using a 40hz crossover at your subs then I sure hope that you are running some free air 8's to make up for the midbass that is non-existant. I'm sure that you 6.5" door speakers are not goin to hit down to 40hz.

Matt

[96firebird311]

Originally posted by Vyse:
There is nothing wrong with a 40Hz crossover point, unless you are a bass-head. I use 60Hz at 24dB per octave. If all that your system is made for is bass, then 80Hz or 90Hz is what you need.

We are talking LP filters here. Just making sure that is clear.