Pairing the Right Amp w/ Speakers

[vladd 26]

Fs on those tweets is 3720hz no way in hell could you play even close to Fs, let alone below it.

Why would you need to if the seleniums are capable of going up to 9kHz?

just a thought, the scendo super tweets have a freq response of 3khz - 22khz, 6w4ps freq response is 80hz - 9khz. Where whould this "gap" come from?

LOL. Specs are crap. No way, no how do those specs portray reality.

[burko 6]

Fs on those tweets is 3720hz no way in hell could you play even close to Fs, let alone below it.

Why would you need to if the seleniums are capable of going up to 9kHz?

just a thought, the scendo super tweets have a freq response of 3khz - 22khz, 6w4ps freq response is 80hz - 9khz. Where whould this "gap" come from?

LOL. Specs are crap. No way, no how do those specs portray reality.

Yeah, the difference between 3k and 9k is pretty significant, there's no way a company would claim to cover that many frequencies if they didn't. (Or maybe there is... Would be pretty ridiculous if there truly was a 6kHz gap in frequencies).

*Change of subject*

Say I was to get a Crescendo 1000C4. They say there is a HPF/FULL/LPF Selection for each stereo channel pair. Does this mean for each 2 channels, or for each pair of positive and negative terminals?

[Impious 1,476]

Fs on those tweets is 3720hz no way in hell could you play even close to Fs, let alone below it.

Why would you need to if the seleniums are capable of going up to 9kHz?

Because in reality they likely can't play up that high, and even if they could it wouldn't be a good idea.

[burko 6]

Fs on those tweets is 3720hz no way in hell could you play even close to Fs, let alone below it.

Why would you need to if the seleniums are capable of going up to 9kHz?

Because in reality the likely can't play up that high, and even if they could it wouldn't be a good idea.

I got ya Thanks fellas.

Oh and I take back my last post, I figured out the controls are for each pair of channels.

[vladd 26]

I was pointing out the Fs just to back up M5, it claims a freq response from 3k-22khz yet the Fs is 3700? So already the specs say that this tweet can play both below Fs and past 20khz

and for the 6" driver...well I haven't heard too many 6" speakers that enjoy playing 9khz that aren't specifically designed to be full range (that one isn't)

you will have a gap

oops, didn't mean to hit the dead horse again

[burko 6]

^^ I understand.

Let's add another question to the pot. Why are there two RCA inputs on these 4 channels..? Aren't they only receiving one input signal from the HU, or am I missing something?

[burko 6]

Ya ninja edited on me lol

[Impious 1,476]

^^ I understand.

Let's add another question to the pot. Why are there two RCA inputs on these 4 channels..? Aren't they only receiving one input signal from the HU, or am I missing something?

Not sure I'm understanding your question correctly. But on most 4-channel amps there are two sets of inputs; one input for channels 1&2 and one input for channels 3&4. This allows you the option to send different signals to the two pairs of channels.

[burko 6]

^^ I understand.

Let's add another question to the pot. Why are there two RCA inputs on these 4 channels..? Aren't they only receiving one input signal from the HU, or am I missing something?

Not sure I'm understanding your question correctly. But on most 4-channel amps there are two sets of inputs; one input for channels 1&2 and one input for channels 3&4. This allows you the option to send different signals to the two pairs of channels.

You caught me right before I could ninja edit. I figured that one out as well.

Why would someone want to send different signals to the other channels? Can somebody tell me a circumstance that this would be relevant?

And finally, if you want to run the same signal to all 4 channels, do you have to run two separate RCAs to each input? Seems lika just another unnecessary wire...

And guys, I pretty much have a general idea of what all of the answers to my questions will be, I'm just clarifying No bashing please...

[Impious 1,476]

Why would someone want to send different signals to the other channels? Can somebody tell me a circumstance that this would be relevant?

There are a lot of situations where you would need the ability to run different signals to each pair of channels.

If you are using channels 1&2 for front speakers and channels 3&4 for rear speakers you could use the front and rear RCA outputs on your headunit ran to the corresponding inputs on the amplifier, allowing you to maintain front-to-rear fading.

If you were using channels 1&2 for front speakers and the rear channels bridged to you sub, and you wanted to use the built in controls on the headunit or another preamp level device (such as subwoofer level, crossovers, etc), you would use the front RCA output on the headunit ran to the ch 1&2 inputs and the subwoofer RCA output on the headunit to the ch 3&4 inputs on the amplifiers.

If you were running active you would need to be able to run one preamp channel to each individual amplifier channel (right tweeter, left tweeter, right mid, left mid).

Etc etc etc.

And finally, if you want to run the same signal to all 4 channels, do you have to run two separate RCAs to each input? Seems lika just another unnecessary wire...

Run 1 RCA cable from the headunit to the amplifier, and use a y-splitter at the amplifier to send the signal to both sets of inputs.

Some amps do have a switch that takes the signal from one input and routes it to the other input internally within the amplifier. Your amplifier apparently doesn't have this feature, however, so you'll just have to use 2 y-splitters at the amplifier.

[burko 6]

Why would someone want to send different signals to the other channels? Can somebody tell me a circumstance that this would be relevant?

There are a lot of situations where you would need the ability to run different signals to each pair of channels.

If you are using channels 1&2 for front speakers and channels 3&4 for rear speakers you could use the front and rear RCA outputs on your headunit ran to the corresponding inputs on the amplifier, allowing you to maintain front-to-rear fading.

If you were using channels 1&2 for front speakers and the rear channels bridged to you sub, and you wanted to use the built in controls on the headunit or another preamp level device (such as subwoofer level, crossovers, etc), you would use the front RCA output on the headunit ran to the ch 1&2 inputs and the subwoofer RCA output on the head unit to the ch 3&4 inputs on the amplifiers.

If you were running active you would need to be able to run one preamp channel to each individual amplifier channel (right tweeter, left tweeter, right mid, left mid).

Etc etc etc.

I see, appreciate it!

And finally, if you want to run the same signal to all 4 channels, do you have to run two separate RCAs to each input? Seems lika just another unnecessary wire...

Run 1 RCA cable from the headunit to the amplifier, and use a y-splitter at the amplifier to send the signal to both sets of inputs.

Some amps do have a switch that takes the signal from one input and routes it to the other input internally within the amplifier. Your amplifier apparently doesn't have this feature, however, so you'll just have to use 2 y-splitters at the amplifier.

Herp derp, that's a fail on my part. Should've thought of that!

Appreciate all the info!

Edited August 25, 2011 by burko

[duanebrow 6]

Fs on those tweets is 3720hz no way in hell could you play even close to Fs, let alone below it.

Fwiw a good rule of thumb is to always crossover at least twice fs. So in this case 7440 Hz. Also bigger drivers start to "beam" above a certain frequency do to their size. I don't know the frequency off hand but most 6" drivers are crossed at 2000hz

Duane

[///M5 2,833]

Fs on those tweets is 3720hz no way in hell could you play even close to Fs, let alone below it.

Fwiw a good rule of thumb is to always crossover at least twice fs. So in this case 7440 Hz.

Assuming a steeper than 1st order slope. Either way, terrible combination IMO.