Njord

In other applications such as radio communication, its not uncommon to use active filters after amplification depending on the particular situation. Mostly lower power situations. Above, I was more-so stating that it could be done.

SQmonster

iTrader: (2)

Do you have pictures?

Njord

pictures of what? a radio with active filters? I'm not sure what your wanting to see, other then op-amps and resistors... Here is a wiki on sellen-key filters. A general purpose Active filter

Keep in mind for those who are trying to gouge my eyes out. I'm new to 'car audio', but have been studying electronics for the last 3 years. (ie, filters, amplifiers, power regulators, micro possessors, ect..)

SQmonster

iTrader: (2)

Hey princess, (gouging your eyes out), that's a passive x-over system. An active x-over would be one that can be changed at any given time.

Here is what Wikipedia has to say about it...

Having the power or quality of acting; causing change; communicating action or motion; acting; — opposed to passive, that receives; as, certain active principles; the powers of the mind.
Quick in physical movement; of an agile and vigorous body; nimble; as, an active child or animal.
In action; actually proceeding; working; in force; — opposed to quiescent, dormant, or extinct.
active laws
active hostilities
an active volcano
Given to action; constantly engaged in action; energetic; diligent; busy; — opposed to dull, sluggish, indolent, or inert; as, an active man of business; active mind; active zeal.
Requiring or implying action or exertion; — opposed to sedentary or to tranquil; as, active employment or service; active scenes.
Given to action rather than contemplation; practical; operative; — opposed to speculative or theoretical; as, an active rather than a speculative statesman.
Brisk; lively; as, an active demand for corn.
Implying or producing rapid action.
an active disease
an active remedy
(grammar) Applied to a form of the verb; — opposed to passive. See active voice.
(grammar) Applied to verbs which assert that the subject acts upon or affects something else; transitive.
(grammar) Applied to all verbs that express action as distinct from mere existence or state.
(gay sexual slang) (of a homosexual man) enjoying a role in sex in which he penetrates, rather than being penetrated by his partner
(gay sexual slang) such a role in sex

Njord

Are you saying a Sellen-key filter is passive? Its not, its active.

Link to wiki
An active filter is a type of analog electronic filter, distinguished by the use of one or more active components i.e. voltage amplifiers or buffer amplifiers. Typically this will be a vacuum tube, or solid-state (transistor or operational amplifier).

However, a sellen-key filter is difficult to change the cut off frequency and slope (your right about that); This can be overcome by using multiple sellen-key filters, and just selecting between the different ones.

I would just use a DSP board if I needed to change such things on the fly.
DSP wiki

hheatt

iTrader: (1)

Alright ive checked out HAT's line up of legatia and legatia pro series and have herd them first hand...i found that they sounded great and the imaging was awesome but were not loud and in your face. I had the chance yesterday to sit in a BMW with k2ps he had the 2 way set up and had no rear fill and they were incredible so punchy in your face screaming at you as clear as possible....i was very impressed! Now i don't know about you but i like my bass and when you have real subs like 2 12" RE XXX and you want to actually hear your speakers i wouldn't buy Hybrid Audio...Sony is way cheaper!

Now when i got a chance to hold both the HATs and Focals in my hand i noticed a huge difference in quality. You can tell Focal has been making speakers for a very long time and they really do there research to make an outstanding car audio and home audio speaker that compare to only the best! Now when your looking at the quality of materials and thought to manufacturing the KRX3 you are blown away from the incredible 3" driver you hold in your hand and cant believe what your seeing, to the new crossovers which have more options than a Blackberry! Now from all the great and wonderful things ive been hearing about Hybrid i was disappointed when i saw there speakers i thought i went to Futureshop to pick these up i couldn't believe the tweeters so cheap looking even the "pro series" looked comparable to a sony set! now the legatia driver felt so cheap in my hand i couldn't convince myself to even attempt to put any Hybrid Audio in my vehicle unless they step up there game or lower the price of there line up because personally for that kind of money i want quality and something that screams pure sex! You can tell Hybrid Audio is new and immature. So ive obviously made up my mind and will be very proud to install Focal in my car...now i know there will be a few ppl on this forum that will differ from my opinion but half the ppl that said Hybrid Audio was amazing are sponsored so what does that tell you?


P.S. I got an inside tip for everyone that plans on competing in any IASCA shows, if you wanna win install Hybrid Audio because the head judge is a silent partner for Hybrid Audio and if that doesn't work and you still get beat that's only because the vehicle who beat you is a sponsored Hybrid car...How fair is that? Wow who knows what to believe Hybrid wins all these shows but who makes the final decisions? a Hybrid partner?!? figure that one out!

MTT

iTrader: (17)

Being a judge for IASCA, I have to say you're talking out of your ***, yes, Jason Gay runs IASCA Canada, and yes he's affiliated with Hybrid audio. but the judges are not!.....Jason does not encourage us to score higher for a hybrid car or any other brand and the head judge at each show tallies up the scores and no one tampers with them.

Secondly, hybrid makes a very good product, I'm pretty positive they don't manufacture their own drivers, but they are built to Mr Buwalda's Specs

Scott Buwalda is no slouch when it comes to car audio competition, he was a world champion competitor BEFORE he started designing speakers.

I won several competitions with my Hybrid gear before Jason Gay was affiliated with them in any way shape or form.

To be honest, I don't run Hybrid anymore because I simply didn't like them (I don't like Focal much either) so there is no bias on my part for or against either of them.

Wanna know why Hybrid wins?
it's called market proliferation along with genius marketing and a good solid product combined with support (owners and team) that is second to none, some of the greatest minds in mobile audio on your side will win you trophies with nearly ANY equipment.

Again, I'm not defending Hybrid as I have refused sponsorship from them more than once, I'm just a little bent that your dumb *** would insult my integrity by insinuating that my judging of a cars sound is in any way affected by the Fact that Jason Gay both, runs IASCA and is affiliated with a company that happens to sell Hybrid.


Not sure why I even replied to someone who compares two different sets of drivers in two completely different environments, but I did.

hheatt

iTrader: (1)

First off watch your mouth you don't know who your talking to! Second off i do apologize for coming across like i was ripping on the judges i wasn't i was ripping on anyone who is affiliated with Hybrid Audio and they need to stop talking out of there ***...and if your not affiliated with HAT than stop being so sensitive!

JohnVroom

you do realize that is a great argument for Hybrid and not so good for Focal right?
agreed to a point, the Focal can easily be perceived as a better made product. To me the construction is secondary, it is the sound that is primary. Though a component set near $1000 should sound great with quality evident

this really does come off more as sour grapes more than anything else and cheapens your objectivity. I think you can buy either, install it properly and simply enjoy the music or do well competitively anywhere


This is just poop on a stick... I do not believe this at all... but of course I am not an insider like yourself

avidedtr

iTrader: (11)

You need to edit your comments, since you haven't got a single clue what you are talking about buddy.