Hey people,

I've got a new sub on the way and thought i'd start doing some research on the best tuning freq to use for a DD 9510. Would like to yield the best SQ possible. Amp will be a Audison LRx1.400 giving it around 900rms.

I'd like to keep the box on the small side as it will be going into a Civic Hatchback.

Would really appreciate your comments

It depends on your taste really.

Either of these is a good option. The larger box will give more low end and slightly flatter response.

Our woofers are designed for high tuned boxes, they will still play well below the tuning frequency. Tuning lower will only rob you output. You can try for yourself by plugging the port to make the area smaller, lowering the tuning.

Phil

I had very good results with a DD3510 tuned to 28 htz, but the 95xx serries is a different breed of woofer.

Yeah what are you after?
As in your first post you said you are only after SQ, I will assume this means overcoming road noise at speed? And you arent all that fussed about output? (with 900 w rms I don't think you'll have any issues with output anyway.)

For an SQ system your sub should only be playing the lowest of low notes to keep your stage in front of you where it should be. You want to disguise the fact that your subs are in the boot; the lower you have your subs crossed the harder it is for you to notice their location. Generally under 70 hz is adequate, but if you have reasonable fronts you should be able to bring this down even lower say 50hz.

For a sub in an sq system you want accurate reproduction of the lowest notes, generally for human hearing it's down to 20hz (below that its human feeling) although the lower the better as it all adds to the music.

For example say you are running your sub lowpassed at 60hz.
Now with a ported box there will be a large peak at the tuning freq and then significantly reduced output below the tuning frequency.

If you have a port tuned to 40 hz, then you will have 60 - 40 hz of controlled bass, and then everything below 40 hz will reduce in output and control. As Phil said the DD's arent designed for low tuned boxes. But they are known to have very strong suspension that will not fall apart under the tuning frequency unlike many other subs. But still keep it in mind when you are tuning.

Ideally if you want to go ported for SQ you want your box tuned as low as possible to keep faithful reproduction of these low frequencies and a flatter response (always wanted in an SQ system)

How do these go in IB Phil out of curiosity...

Well basically i just want nice, low and tight bass. I'm not overally concerned with extremely high output (although i think it should be alright like this) because if i ever do decide to compete in say db drags then i will either build a different box or make an interchangable port for this box.



The planned front stage at the moment will be a some 7" Dynaudio's and morel supremo's running actively.
In previous systems i've ussualy crossed the sub at around 60hz.

Thanks for the info guys... keep your opinions coming, especially those that have had first had experience tuning boxes for these subs.

That's not SQ. That's boring.

Music is exciting when it's loud. Why would you only want to overcome road noise?

Phil

i think appreciating all the fine little details in a song, appreciating the instruments is far, far more exciting.

but each to their own.

Yes if you think music needs to be deafening to sound good then it will eventually deafen you. (and your customers Phil )
I want to only overcome road noise at speed as I dont need everyone else to hear my system, it is for me i dont need to turn the heads of schoolgirls, and with around 2kw rms of power it is not quiet at all anyway.

As you start to push the extremes your body literally starts to shut out the noise to protect the delicate inner ear. The bones in your ear shift and blood vessels contract iirc. This is temporary threshold shift. Longer term exposure results in permanent threshold shift and is incurable. This all occurs around the threshold of pain for human hearing which (depending on the frequency) is between 100db-130db.

I appreciate music and I want to appreciate music for as long as possible. Without ears what good is car audio?

Per1od, the dyns are a very nice midbass.. and the 7"s should go very well for Sq. The Supremos speak for themselves. Im sure you'll be very happy with it.

At the end of the day, for SQ the sub itself isnt that big a factor. If you are playing large midbasses then these will cover the majority of your bass if you cross your sub around 50-60 hz. Make sure you have lots of door prep to keep your midbass clean and tight.

Again how do these go in IB or AP, or sealed for that matter. Phil?
Per1od a seperate box for SPL sounds ideal as well.

I never said it had to be deafening!

Just not a background level!!!

Phil

It may be prudent to stop assuming that your idea of Sound Quality is the same as what someone else's is.

Based on your posts in this thread, I can assume that your idea of Sound Quality is 150kg of Dynamat and a stock system. Of course I know it isn't, but just read a little more widely and you won't get drawn into e-stoushes with DD Phil

I don't really see how a 2kw system with no stock gear is stock But whatever floats your boat.



Anyway back on topic, Per10d has said that he is not overly concerned about extremely high output. And wants to know what the best tuning frequency is for his box for SQ. eg: accurate reproduction (or is that just my definition of SQ as well? )

I would have thought that 40hz is a tad high. But maybe that's just me. I would go under 30, but dont have any experience with this series.

I can't imagine running a woofer like the 9510 if you're not concerned about output.

The 9500's strength lies in its ability to sound great at high output levels. Honestly, with 100W & 110dB, our 1000 would do the job.

To me, SQ in the car is a tricky subject. I am a realist. I don't think you'll ever get a car sounding as good as a high end 2 channel home music system, it's just too hard in the automotive environment. Sure, I've built incredible car systems, but no car system I've ever heard comes close to the mega home systems I’ve had and heard. At home you can even control the room, this is something you can't do in a vehicle.

That said, my 7.1 home cinema, with thousands of watts and four 15s can't even come close to my car systems. The intensity you can generate in a car is something you just can't do in a room. My family room is 9x6x4.7m, my car is under 1.5x1.5x1.0m.

To me, car audio is all about energy and excitement.

Phil

Maybe all that 150dB 'SQ' does damage to the eyes too? Fantastic off topic personal sprouting, with a complete absence of answer to this fairly simple question....

I've run 3500s sealed (replaced 4 Boston PRO 10s in a Pathfinder) but never 9500s. The 35s worked really well, even in only around 0.5 cube each, powered by a GT28.

9500s work well in bandpasses, I use a 4th order in our ute, Simon at Alberts has down a few 6th orders recently with great success.

As far as IB, given their stout suspension it could work OK, but would most likely require some intensive EQing.

40Hz tuning sounds high I know, but these woofers are built for that alignment, it really does work.

Phil

thanks for all the input fella's... much appreciated!

Time to just get cracking on a box and see waht works best. But i definetly have a good idea on where i'll start.

Cheers