Hey guys

Im considering some front stage options, I have spotted the above woofers.

The manual says the freq response is 30-3000hz, I was wondering how realistic this is?

Ill have to get away with a 2way system for the time being. I plan on buying a headunit suitable for active later on.

I currently have MBQ reference 6.5s and was thinking of running the woofer off these xovers until I can go proper active. I think I read the xover is a bit high @ 4200hz 24db.

Can people suggest some sealed mids and/or tweeters that play lower, as im leary tight on space in kicks/dash.

Cheers
Brett

I wouldn't expect them to usefull much beyond 1-1.5khz, beaming, cone breakup and possibly voice coil inductance will take care of that.

Having used a dyn 8" (similar in designs), and morel elate 6", I woudnt advise using the 9" elate higher then ~1khz. I would suggest using it as the midbass in a 3-way set, or finding a horn/ribbon (have fun mounting) that'll play down to 500-1000hz.

Agreed. Being a paper cone I'd doubt you'll hear the breakup, but beaming will eliminate any possibility of using it beyond 1.5 kHz.

Thanks for the input guys.

Would it be wise to run a semi active setup as follows:

9s independant off 2x280rms, playing 70-500hz (?)
MBQ 6.5 woofers/tweets in kicks, no enclosure, high passed to play 500hz up?

Im not sure how low I can run the mids (6.5s) before they'll need some sort of enclosure. I was just guna fg some kicks up.

Id really like to run the setup off a 9815 or the likes, im not after competion winning sound, will be a street beater. So prefer not to buy external processors/eqs etc.

Appreciate the input

if your using proper 6.5" splits, which i assume you are, you can play them down much lower..
and if you dont want your "midbass" playing a lot more than midbass, cross them over ~300Hz mark..

i think the 9815 can run semi active.. but you'll lose your rear "output" if you run rears unless you run them from the "high" output along with the quarts.. might pay to look in the manual to see if you can run a bandpass crossover on the 9's.. as you'd want them playing from ~80Hz - ~300Hz...

or if you can, look at the 9887 or the current model alpine units as i know for a fact the 9887 can run semi active 3 way front & sub..

Ahh k. The reason I dont want the 6.5s playing any midbass is ill have the 9s & i dont want to have to make a kick panel enclosure. I figure midrange can play infinite baffle fine.

I would of thought I could run the 9s a bit lower than 80hz?
Im not running rears either.

Whats a 9887 worth? ()

Ill have a run through the 9815 manual later. Cheers!

Your midrange would be playing freeair, not infinite baffle.

ahh k whoops.

Is it ok to run midrange freeair?

It won't damage it, just limit lower frequency response.

Ahhk sweet

Which reverts back to my original question, how low should I play free air 6.5 mids?

300hz ok?

Not very - as a general rule, the "frequency response" specification quoted by speaker manufacturers is exceptionally overshot and far from realistic. They are about as accurate a spec as the "watt" rating off a boss amp.



The Supremo 9 is paper, the Elate 9 is poly



You'd be surprised, but not really. A lot of very good 8" midbass drivers out there begin rolling off as early as 150hz and are down by 3dB or more by the time they reach 80hz.



Probably, however you also may need to consider issues with resonances and controlling backwaves - this may prove a headache in a car without a solid baffle.

Wow didnt think they'd roll of so fast. I pictured the f3 down around 50-60hz. Spose I could of looked it up lol.

In regards to controlling backwaves, ill have fg kicks with dynamatt everywhere.

I guess id need to bolt the kicks to the car very solidly and ensure no leaks around the edges, in effect creating an enclosure.

Wow it never ends with car audio lol

Thanks for the responses

Not saying the Morels WILL roll off that soon (can't check the driver data, as my net has been slowed by Telstra and left me crippled).

However, I know the Dyn 8" midbass drivers isn't that much more impressive then a lot of good 6.5 inchers, and I wouldn't be surprised of the Morel isn't too far above.

Even some very impressive home audio drivers (such as the Peerless HDS/ HDS Exclusive) suggest a roll off beginning very softly around 150hz and then gradually rolling off until they are around 3dB down at 70hz. Cabin gain may help slightly here, however by the time it kicks in the response will likely be too far down for it to really help. Also, to get it to play low enough to get assisted by cabin gain, you'd need some pretty well sized sealed enclosures (that doesn't mean car doors).

On the other hand, there are 6.5" (Focal 6W3 Be, DD DDW6.5) and 7" (Scanspeak Revelator, Rainbow W175 Power) that will offer similar or better bottom end performance with lesser bulk.


Have a look on the Morel site, and see if you can locate some TS specs or a response graph, these can give you some rough indication of what to expect from them.

If the enclosure is up to scratch, you can run the 9's down all the way if you want, as they'll be excursion limited (volume dependant). If you like to spin the dial, I'd say 40-60Hz would be the bottom end for a good 9 (and the Elate's are true 9's, not like the Dyn's which are closer to a 7").

If you run with a newer car, you should have 'seperated' passenger and driver side segments by the transmission tunnel (newer vehicles have them quite deep) and this will greatly contribute to a frequency boost around the lower midbass frequencies (it actually makes a lot of cars quite peaky).

With a bit of EQ on the bottom end, you'll have no problems driving a 9" to blend well with your subs.

Just be carefull Pete. Alot of speakers have a lowerish F3 point, but, run out of excursion to play that low at anything aboive 90-100db (for example).

Bassbox Pro is a great program for showing you such things. Im sure you know that, but, just wanted to make it clear for others reading.

i'd go down to about 200 lowest on free air 6".. but only up to 2k if they're on-axis. off-axis, really 700Hz is the highest I'd go there.

The standard xover point on them is 4.2k. I plan on leaving the splits passive, and running a bandpass on the 9s, with a HPF on the splits.

9s bandpassed 70-300hz (2x280rms)
6.5splits 300hz up (2x280rms)

Im not after a fully active proper 3way just yet, just a nice sounding musical system, so ill have to make some comprimises for the time being.

Then ill buy some proper amps and go full active.