Change the way you think about speakers with unreal accuracy

[Moble Enclosurs 10+ year member]

Finding rf in a area that has losses and many different materials is hard..The sealed box trick is a good start but once you reach 140+ it's going to change..

To add to this, it's great that you mention 140dB, because also, and ironically after that, your ability to understand signals and frequencies for music fades around that same level. Great point!

 

[Moble Enclosurs 10+ year member]

Its not just mechanical thermal and electrical..

Of course. There are more variables than we want to consider. That is what makes acoustics so difficult for people. Variables. And everything is a variable.

 

[shizzzon 10+ year member]

You know, as much as I am into acoustical engineering and have been doing it for many years, I do agree with this, but will add that having it calculated first will get you there faster in most cases when you are ready to build anything. Much more fine tuning will be needed otherwise, and that is where calculations come in. They are not jsut a specific solution. They are based on trial and error for decades. So, they do exist quite well together-hands on and calculations that is....as long as the calculations are as correct as possible, which most people have yet to discover.

I agree with that.

Even on my own installs I do try and get an estimate of how the vehicle responds to certain enclosures and placement areas and how the car's response reacts to all these before i jump in and build it.

Trick sometimes is even though the car's resonance is efficient way to tune for, it can also be limiting potential if goal is just for burping.

Sometimes one must overcome the car's resonance even if aiming for a frequency is -12db lower than the car's resonance, making the enclosure efficient enough can yield higher scores than resonance peak...

But i'm just blabbin.. on with the topic.

 

[Team TH (Donny) 10+ year member]

That's not the recommended way but since i've competed for quite a while, I can tell you it doesn't matter...
Trial and error tuning is the best when it comes to getting the highest score.

Reason being is firing direction and volume displacement internal and inside vehicle can\will effect resonance of the vehicle!

With so many variables, it's best to just build, then adjust using trial and error.

Yeah, that's what I have always done and figured would always continue to do.. I just start out with a build and test with the TL testing and tuning, changing different variables of the box/build/vehicle/etc until I get mad, bored, or broke. Lol.

 

[Moble Enclosurs 10+ year member]

I agree with that.Even on my own installs I do try and get an estimate of how the vehicle responds to certain enclosures and placement areas and how the car's response reacts to all these before i jump in and build it.

Trick sometimes is even though the car's resonance is efficient way to tune for, it can also be limiting potential if goal is just for burping.

Sometimes one must overcome the car's resonance even if aiming for a frequency is -12db lower than the car's resonance, making the enclosure efficient enough can yield higher scores than resonance peak...

But i'm just blabbin.. on with the topic.

This is a great point and one of the tougher parts of designing an SPL enclosure with someone who is looking at a specific tuning frequency. Someone might say, " I want it to burp at 37Hz", but when I tell them, that peaking the design at this frequency, will only yield a 6dB increase from 0 referenced on 2.83V efficiency based on the -23dB loss at that frequency with the placement and such considered in the design due to cabin loss, they get disappointed sometimes, because they have their ears set on that frequency-something that someone before told them was optimal, lol.

But this is also where I have to consider placement of other areas for increasing this if they have no other goals. Can make for a tough and long design process. Some have to understand that sometimes, with their goals set high, it just wont do well. I like this being mentioned.

 

[Moble Enclosurs 10+ year member]

I gotta get off here for now, though. Keep going with this though. Might open some eyes.

 

[Team TH (Donny) 10+ year member]

shizzzon, just out of curiousity.. What is your highest decibel you have hit, and highest decibel hit by loudest fellow member of the team (unless your solo)?

..On a Term Lab..

 

[shizzzon 10+ year member]

not that loud.. I don't present myself as being very good at burping because i never have the time to tune for months.

I am actually the loudest on the team, lol..

I have done a 153.4 at the headrest in MECA at SBN last year and a 157.2 in the kick undocumented on exact same setup.

Because i like to listen to music too, i'm more geared toward the longevity use of the system rather than burps so their is some resistance in my potential right there.

I'm currently installing something what many would call "epic" but no sense in talking about it here since it's far from done.

 

[Team TH (Donny) 10+ year member]

Sweet. Those are good numbers.. I'm only twenty and have been competing for two years, though have installed since I was fourteen. Anyways, do to lack of money and only competing for two years loudest I have got is 150.0 at 53 Hz in kick. That was with stock alt, red top battery, only big three for electrical. Was clamping ~1750 wRMS. Used 4 cheap subs for this build just because, lol.. They were $90 each Logic Soundlab FX15PRO's. Consider the variables I consider that pretty decent. The Mazda was a piece, system lacked electrical and would run at 11.4v. Basically my biggest issue has been funds for my builds. I have lacked funds horribly. Loudest on our team is in M4? I believe hitting 153.3ish at headrest? And around 155.3 in kick. He uses 2 DC XL's, DC 9k, and an XS 3100 battery.. He peaks around 48 hz. I'm still fresh to competing but I believe I could do really well if my budget would let me and if I wanted strictly numbers. I prefer daily builds seeking decent numbers. I have never personally blown a sub/amp, ever.

 

[Team TH (Donny) 10+ year member]

My goal for the build for the explorer is hitting around 152 db. Box will be tuned at 33hz. Burps will see around 5-6k rms (depends on box rise/etc). Not really seeking highest numbers with this setup but more for fun, lol.

 

[Papermaker85 5,000+ posts]

152 with a 18 is obtainable..

Just remember that phase between the rear wave must be 3G longer than the front wave..

A couple measurements can get you very close without guessing..

Phasing in a ported alignment are extremely important..

What six and tune your using ad well as sub and port area?

 

[Moble Enclosurs 10+ year member]

152 with a 18 is obtainable..Just remember that phase between the rear wave must be 3G longer than the front wave..

A couple measurements can get you very close without guessing..

Phasing in a ported alignment are extremely important..

What six and tune your using ad well as sub and port area?

I might have to try that. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I have not used 18s for SPL on myself yet. Usually stick with smaller drivers.

 

[Team TH (Donny) 10+ year member]

It will be my first 18. I mostly just stick to 15's but went from small truck to an Explorer! I can't wait to get started with the build //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Papermaker85 5,000+ posts]

I figured u was gonna use the xcon 18 in ur sig..

Larger drivers are more efficient but you must have the correct alignment..

In the explorer I'd say a signle 18 if you want a single woofer will be your best option..

 

[Team TH (Donny) 10+ year member]

Yeah that's what I was thinking.