High Pass Filter (HPF) and Low Pass Filter (LPF) Mega Thread

[agedhorse]

So...The Genzler Magellan has a HPF in it?
Mesa Subway D-800 has one fixed point in it

Do the Markbass heads? SA450 LMII?

My tube preamps and led sled power SWR Stereo 800 does not?

Could this be why we like the girth of led sleds compared to class D and switchmode power amps?

Probably not. Every "lead sled" amp that I have designed has a HPF built in. HPF's are not exclusive to Class D amps with SMPS.

One important reason why HPF's have become popular (and useful) is because amplifier power has been increasing faster than most speakers REAL WORLD power handling has increased (though some manufacturers appear to through the use or creative marketing numbers). Common sense and good judgement hasn't kept up all that well with increasing amp power either. This means that amp designers must become smarter and more proactive, otherwise the increase in speakers failures would crate a bunch of other issues (including warranty issues).

No responsible amp company wants to see a player damage their speakers because they don't understand how speakers are rated, or why good judgement is more important as power levels increase.

 

[PraiseBassing]

Car audio amplifiers have had variable HPF/Sub-Sonic filters built into them for quite some time. Pro audio amps as well. Bass amps are starting to catch up.

 

[Old Garage-Bander]

Car audio amplifiers have had variable HPF/Sub-Sonic filters built into them for quite some time. Pro audio amps as well. Bass amps are starting to catch up.

Well if we are judged by car audio amp standards, I'm outta here.
Bad enough those cars have their fenders rattling, I don't want to rattle my Fender too.

 

[agedhorse]

Car audio amplifiers have had variable HPF/Sub-Sonic filters built into them for quite some time. Pro audio amps as well. Bass amps are starting to catch up.

More accurately, SOME bass amps are catching up to others. I've been using HPF's for at least 20 years...

 

[PraiseBassing]

I also can't imagine amp makers wouldn't add something to protect speakers in ported cabs. I know in car audio you generally set the sub-sonic filter 5-10hz below the cab tuning for ported cabs.

Well if we are judged by car audio amp standards, I'm outta here.
Bad enough those cars have their fenders rattling, I don't want to rattle my Fender too.

That ampeg fridge will rattle your Fender on stage and the fender of your car in the parking lot.

 

[PraiseBassing]

Besides, this is a safe space. No one is judging here.

 

[BadExample]

Good deal:For Sale - Broughton HPF

I clicked the back button as soon as seeing the sellers response to a simple question.

So...The Genzler Magellan has a HPF in it?
Mesa Subway D-800 has one fixed point in it

Do the Markbass heads? SA450 LMII?

My tube preamps and led sled power SWR Stereo 800 does not?

Could this be why we like the girth of led sleds compared to class D and switchmode power amps?

Yes on first two and probably anything Genz Benz.

I dunno on MB stuff.

On SWR I wonder of @agedhorse knows?

As I understand tube ampetry, thy don't need one or not so much. I should be corrected on that in a few minutes.

 

[Old Garage-Bander]

I clicked the back button as soon as seeing the sellers response to a simple question.

Me three.

 

[lowplaces]

Good deal:For Sale - Broughton HPF

Thanks for the heads up !

 

[Al Kraft]

I clicked the back button as soon as seeing the sellers response to a simple question.



Yes on first two and probably anything Genz Benz.

I dunno on MB stuff.

On SWR I wonder of @agedhorse knows?

As I understand tube ampetry, thy don't need one or not so much. I should be corrected on that in a few minutes.

At least in the Steve Rabe days of SWR I don't think any of the bass heads had a HPF. Maybe they added them in during the Fender days, and I would suspect that the final versions before the brand was discontinued (Headlite I think it was called) did have some type of high pass filtering.

 

[RoadRanger]

The SWR bass amps I've seen were cone flappin' monsters that kill drivers .

 

[Wisebass]

Common sense and good judgement hasn't kept up all that well with increasing amp power either.

Hi Andy

Maybe design an amp with a "common sense button" instead of a 'Master volume"...

Of course min would be 12 and and max would be 0!

But of course, certain clients wouldn 't understand that either



greetings

Wise

edit for desnigni

 

[murphy]

I clicked the back button as soon as seeing the sellers response to a simple question.

me four

 

[murphy]

My Alembic F1X has a high pass filter...but only goes as low as 70 hz

 

[adje]

My Alembic F1X has a high pass filter...but only goes as low as 70 hz

It's the cross-over frequency, the preamp has two outputs. So you could use it as a HP filter, but it's intended for bi-amping.

 

[murphy]

It's the cross-over frequency, the preamp has two outputs. So you could use it as a HP filter, but it's intended for bi-amping.

Yes I know...but it was fun experimenting to see how it would sound just using the high out of the crossover

 

[shwashwa]

Yes I know...but it was fun experimenting to see how it would sound just using the high out of the crossover

Interesting! How did it sound? What if you use the high out with the cross over set to 70 but you boost the lows?

 

[grinx]

do the HF Level and Freq knobs on the F-1X do anything if running Full Range into one cabinet?

 

[NKBassman]

70 Hz is the first/lowest setting on my Universal Audio M610 mic preamp, and it's definitely high enough to notice a very audible difference. It's not so high that it makes it unusable for bass though, and when I'm practicing through my home studio rack and headphones I'll kick it on just to save my ears a little. Just boost the bass up a little more on the way in if you need to.

 

[Stumbo]

Good thread from our Effects bros: HPF options?