Polk SR 5250 High pass

Winwin

Hello,

I'm considering buying the SR 5250.

I would like it to play down to 100Hz, but my modeling software tells me that 150 is the lowest it can go with 50w rms. 3mm Xmax is not too good.
Whats your opinion on this?

And, as I can't listen to the speakers before, does the SR 5250 play as good (or better) than the SR 6500?

Thank you

PS: I rellay like with high Qts of this speakers

skydeaner

I wanna know too. Someone chime in here. And for the 100hz, what about just increasing the slope of the crossover? Is that modeled at 12db/octave or even steeper?

Winwin

I'm talking 100Hz 36db/oct.

MacLeod

I think youre both overthinking this. My 6500's are crossed over at 70 Hz and play just fine. Im pretty sure the 5250's can handle 100 Hz with out much hassle.

Second, I wouldnt worry about Xmax for midrange drivers. These things are very effecient and have plenty of smooth, well rounded midbass.

The Swede

Hey Guys, I can say like this. A friend of mind has the kit SR6500 in his car and he High passes them to 40Hz -36db so it shouldn´t be any problems taking them down to at liest 60Hz without any problems.
By the way I´m going to get myself a pair of them as soon as they are out in the market. I can´t wait.

skydeaner

Where do you get something that crosses them over that sharply? Most I have seen is 24, I want a 36db crossover

Peter J

A little correction is in place her to correct my dear friend The Swede. My crossover setting are 40Hz/24db and 5030Hz/24db on my SR6500 kit.

And the amp thats givs power to the speakers are a Signat LAB4 4*100wrms att 11volts.

The Swede

Okey just got it a little bit wrong should be as Peter writes 40Hz/-24db. Posting a little picture of his installation of the SR6500 middrange.

MacLeod

Youve got the mids going up to 5000? That a little steep for my tastes.

I also dont like pushing them any lower than 70. If you like it thats all that matters but I dont like running a midrange any lower than 70, and usually no less than 80.

The Swede

Okey MacLeod,
I get and understand your upinion but isn´t the middrange speaker the most important speaker giving back the music and the song correctly or should I say in a most realistic way ?

MacLeod

For the most part yes but that is why its critical to not make it play frequencies its not capable of playing well.

A 6.5" mid running down to 40 Hz is just too low. A midbass speaker would have trouble reproducing 40 Hz properly much less a midrange.

Same with 5000 Hz. That wonderful tweeter that comes with the SR's is much better suited to play those frequencies than the midrange is.

My opinion is to let the midrange play the frequencies that it can reproduce well and without distortion and then let the other speakers (subs and tweeters) pick up the ones it cant.

cam5860

Midrange speakers need to be crossed over at 100 hz if you like to play them loud as hell like me. Ive had mine crossed over at 80 hz which sounds better because you get fuller bass responce, but at high levels of play they will distort not a lot but they will. If you like to play your music at normal levels 80 hz is fine but i would not go below 80 hz.

MacLeod

That is a good point too. Still you dont want to go too high because then youll have to use the sub to compensate and subs playing 100 Hz aint pretty.

The Swede

No having a sub playing 100 Hz ins´t pretty, but as the producer of the SR6500 kit says in the manual the system is to use between 40Hz and 30kHz. Why don´t use the stuff ?
I can only say for myself, it sounds very nice and accurat as it should. Why don´t you try and see the result for your self. If you have any trubble you always could put a 8" woofer infront to give a little help with the sub.

Peter J

I belive that you should use the speakers at their maximum, not after a theori. I tweak my car after how it sounds and not after a id

MacLeod

There is a difference between playing 40 Hz and playing it well. Play a 40 Hz tone thru a midrange speaker and then play it thru a 10" sub. The midrange will make a noise and youll hear it but the sub will play it fully and youll feel it. A midrange speaker just isnt capable of playing a 40 Hz tone properly because it doesnt have the physical size and displacement to move enough air to play that low.

Also, forcing a midrange to play 40 Hz will likely cause it to distort coloring the rest of the output of the mid.

So why make a speaker play frequencies it cant play well and screw up the rest of your SQ? Why not make the speaker play the frequencies it is meant to play and can play cleanly and let your sub take care of the sub bass. After all, thats what theyre there for.