Speaker Frequencies
 

Alright next step in my system is speakers, I can put 5x7/6x8 in my door panels and in the rear.

When looking for speakers i understand it's not good to have a low frequency response because your subs put out your bass, not your speakers. The higher frequency, the higher notes you can hear better, so tweeters should jump to about 22kHz it looks. For door speakers is 56Hz a good baseline for low frequency's or should i go up a bit higher?

Also when a speaker has a high pass crossover, wtf is that? For your amp to allow more high frequency's through?

22khz is more than enough considering the human ear can only hear up to 20khz. You don't need to look nearly that high. 18khz is perfectly fine, there is no music that reaches that high, so you still have lots of head room.

As for the low end, if you have subs, you won't need your speakers to play lower than 80 hz (depending on where you set you sub crossover, you can go higher than that, or lower: 80-100hz is a good crossover setting.

When a speaker has a high-pass crossover, it means that the bass notes won't make it to the speaker. High pass means - the high notes bass through while the low notes are blocked. So you will have high-pass crossovers for your speakers and low pass cross overs for your subs.

Most amps also have these crossovers built-in. When your speaker has that, it simply means that regardless of what amp you connect it to, it won't allow bass notes to get through (probably 6 or 12 db / octave).

alright that makes alot of sense.

When your looking for an amp to run a set of 6x9's @ 4 ohms that each have an RMS wattage of 75W, could u get an amp that runs 75 x 2 @ 4 ohms, or 150 x 1 @ 4 ohms? or would both work

My personal rule of thumb is you can run a decent quality set of 6X9s with up to twice their rated power as long as you cut off the low frequencies (below 80hz or so).

2 channel amps with that much real power are fairly pricy...... RF, MTX, Alpine, Orion, Kicker and others all make good quality 4 channel amps in the 35 to 50 w/per channel range that will give you plenty of power bridged to 2 channels.

HTH

The 75 x 2 is fine, but as was mentioned, you can give a quality pair of 6 x 9 more than their RMS, (I personally wouldn't double the power though - I'd go to 100wrms x 2)

The 150 x 1 @ 4 ohms isn't what it looks like. You will be looking for 150 x 1 @ 2 ohms. When you combine two 4 ohm speakers it will create a 2 ohm load final.

So with the 150 x 1 @ 4ohms, if that is a stereo amp bridged into one channel, loading it down to 2 ohms will smoke the amp.
If is is a mono amp, it could produce as much as 300wrms x 1 @ 2ohms, so each speaker will see 150 watts each - which for BigRedGuy would be the double power that he is looking for.

Your assumption that when 2 speakers run off 1 channel while share the wattage is correct.

Problem is he's asking about 6X9s.....if he uses a mono amp there's going to be another issue....:D

Stick with multi-channel amps for your mids and highs. Mono amps could be wired up to run your system in stereo, but it's more work and most mono amps these days are better suited to run subs.

Anybody else besides me remember the big purple Orion NT mono-blocks?....:smokin:

Ahhh....the good old days...:smilie_da

^^x2 and yes was a real killer brother had 2 in his car
what he didn't do for in gas....
made up for it in shock waves

For a 100watt amp, they were amazing.....:smilie_da

Saw a car many years ago with 3 of them, one for each front channel and the third running a single 15....the sound was great and it was the first time I saw someone use neon in an amp rack. The amps were recessed in individual white boxes behind plexi and the visual effect was :eek: :worshippy

It's a darn shame nobody makes purple marble amps anymore.....:dunno: :D