Yaris Sedan Deadening and Sound system upgrade

[derickveliz2]

Originally Posted by sqcomp

Done. This testimonial is on a forum specifically for such topics.

Derick...we really need to get you into an L3v2 or an L4v2 to replace that ML-70...

I was trying to find it but no luck, could you PM me a link please?

Thanks

D.

[sqcomp]

TOLM-The ONLY reason I'm using these capacitors is for tweeter protection. They help protect the tweeter from amplifier turn on/off DC transient pops (which occur after the active crossover), and they help protect against accidental tuning mistakes. That is all. I refuse to be taken captive by a crossover network that does not have any flexibility and is as big as a tank. The less parts the better.

As for the phase inversion and slope adjustability, I have no issues. I can flip phase at the push of a button...on several points of active processing.

Don't think for one second that at any time there will be a passive two or three way crossover hulking anywhere in this vehicle. While I can make it pretty, I still know I'm looking at a dinosaur.

To remind you, none of the SQ world champions at INAC used passive crossovers that I noticed. There's a reason for that.

*note - this response might sound harsh. It isn't. I'm at such a place where passive crossovers are a hindrance and a step backwards. I react a certain way when people tell me to give up flexibility and adjustability for convinience.

@ Derick - the post was placed on a private Hybrid Audio forum only accessible to Team Hybrids members. *hint hint* put in an application as soon as you rid yourself of the ML-70.

[sqcomp]

Here's something from one of the old school car audio OGs, Richard Clark, in 2001:

"Tweeters are expensive, and I’m sure that there’s nothing more frustrating than purchasing a pair of $200 tweeters and having one of them destroyed. Tweeters, and especially horn drivers, are extremely sensitive and fragile. One common failure mode for tweeters in systems with electronic crossovers is failure to provide protection from unintentional low frequency transients. Woofers have been known to move great distances when amplifiers are turned on or turned off or a RCA comes partly unplugged, but what about the tweeters?

If the tweeter is fed from a passive crossover, it will naturally be protected from this phenomenon. But, what if it’s attached directly to a monster amp? Since tweeters were not designed to move more than a few thousandths of an inch, what happens when they get popped by an amplifier? The answer is that they typically suffer from suspension fatigue and become permanently damaged. There’s no remedy for damaged tweeters, and they will produce constant distortion until they are replaced.

Simply plugging and unplugging an RCA lead from an active crossover or an amplifier driving a tweeter will often cause a potentially damaging pop. The pop in a tweeter may not always be audible, but the damage will occur electro-mechanically. (This is one of the reasons that a couple of Japanese amplifier designs included a feature that required a chassis ground connection to the RCA connector before the amplifier would engage.) There is no reason to put tweeters at such risk because the necessary safety precautions are both inexpensive and easy to install.

To protect a tweeter, a bi-polar crossover capacitor should be inserted in series with the + terminal. (It really doesn’t matter, but let’s be consistent.) This “safety” capacitor will block dangerous pops and spikes, yet, it will permit the audio to pass.

For example, let’s say we’re using a crossover point of 2000 Hz on a tweeter with an impedance of 4 ohms (at 2000 Hz). One-half of 2000 Hz yields an f of 1000 Hz. Solving for C, we arrive at 40 mfd (39.8 mfd if you’re a math buff) for our safety cap. Remember, electrolytic caps can be used as long as they’re bypassed properly. Again, polystyrene film capacitors should be used for bypassing. If this is done correctly, the safety cap will have no affect on sound as it’s too low to have any audible effect, but if any low frequencies slip by they will be removed before they can cause damage. A tweeter safety cap sort of acts like a “subsonic filter” does for a woofer, only it works at the frequencies that are troublesome to tweeters.

That’s it for this issue. I’ve been using these techniques in studio and pro audio applications for decades, and they’ve saved me many times. I hope that you’ll consider including small bypass and safety capacitors in your next system. Someday the tweeter you save may be your own!

[patm]

Sqcomp,

How you been.

[sqcomp]

Busy as you can tell.

I'm laying down another set of kick panels. This time I'm re-aiming and going to try to incorporate the raw carbon fiber weave I purchased. I may incorporate the leftover Kevlar weave as well into the kicks for the mid range speakers.

Going to power up the horn's compressor, wrap the mounting panel for the compressor and the tank, and do more A-pillar buildup on Monday.

[sqcomp]

Just laid the back and baffle of the driver's side kick in kevlar reinforced with 1.5 oz mat. I'll be trimming and laying some more kevlar tomorrow as well on that left side kick.

Interesting material. It's good for some points in IQc because of exotic materials.

I've got some CF weave mat I'm going to look at using on the kicks somehow. I'll figure that out when I get there.

...and yes, I have pics. I just want to get a little further before I post them...

[derickveliz2]

Originally Posted by sqcomp

Just laid the back and baffle of the driver's side kick in kevlar reinforced with 1.5 oz mat. I'll be trimming and laying some more kevlar tomorrow as well on that left side kick.

Interesting material. It's good for some points in IQc because of exotic materials.

I've got some CF weave mat I'm going to look at using on the kicks somehow. I'll figure that out when I get there.

...and yes, I have pics. I just want to get a little further before I post them...

I saw a video of Scott B. and his Nissan Altima talking about exotic materials, mmm what if I bring from Central America some hard wood from the deep rain forest? this stuff is expensive and hard like a rock.

D.

[derickveliz2]

So I should be looking at a pair of these? one set for each tweeter?



D.

[sqcomp]

Those caps will only cost $13 and some change. It's a pair of 30 microfarad and a .01 microfarad that helps alleviate what RC called the ripple effect IIRC.

Order them, send them my way and I can put the special treatment on them to make them a little more high speed if you want and get them back to you all snazzy like...if you want or I can just guide you on how I'm prepping mine with a little "tutorial"/picture guide.

As for the exotic hardwood, where are you going to fit it in that would earn you creativity points? I can think of several items that could have exotic wood used but i'd rather hear your thoughts first.

[derickveliz2]

Originally Posted by sqcomp

Those caps will only cost $13 and some change. It's a pair of 30 microfarad and a .01 microfarad that helps alleviate what RC called the ripple effect IIRC.

Order them, send them my way and I can put the special treatment on them to make them a little more high speed if you want and get them back to you all snazzy like...if you want or I can just guide you on how I'm prepping mine with a little "tutorial"/picture guide.

As for the exotic hardwood, where are you going to fit it in that would earn you creativity points? I can think of several items that could have exotic wood used but i'd rather hear your thoughts first.

Thanks I'll put an order for the caps, do you know any web-stores? suggestions?

Exotic materials... mmm all baffles instead of using MDF (L6's, Mids, and Tweeters) Also would like to make a custom grill made of an exotic material for the L6's with the HAT logo. I asked Scott B. if that was ok, he sent me a file with the official logo that I can use.

D.

[derickveliz2]

BTW

We are having a meet with guys from DIYMA next week Saturday May 26th at 1 P.M. in West Boylston, MA.... every body is welcome!


Here is the info:

Saturday May 26th at 1 P.M. West Boylston, MA

It's around the corner from the Stone Church in West Boylston Ma.

There will be a Green Alien out by the road to help you find the spot.

Here are the coordinates:

42°22'12.23"N 71°46'54.86"W





D.

[why?]

a green alien? lol.

So I hopped over on to the HAT forums and saw Scott's car build thread. First post made me laugh considering what it is now.Audio is going to be VERY simple... If that is what he does to a car for a very simple audio system I wonder what his idea is of complex.

I think I am going to take a stroll to CTScott's that day unfortunately, but if not I might visit you Derick. My coilovers should be on correctly and I need a nice long drive.

[sqcomp]

The G35 is a relatively simple install. Think about that G35 install versus Black Betty. BB is definitely a more advanced install.

I've been able to have hands on time with both cars. The G is made for a realistic every day driving situation. BB on the other hand...it's a dedicated show car with a much different sound stage presence.

The G35 was an interesting car to demo for people at SBN this year. It has it's quirks like a normal car would. That being said for a car without tweeters and on all D class amplifiers, it works very well. Well enough to win another world championship.

[derickveliz2]

Originally Posted by why?

I think I am going to take a stroll to CTScott's that day unfortunately, but if not I might visit you Derick. My coilovers should be on correctly and I need a nice long drive.

I really wanted to go to CTScott, we've been talking so much about it, but I committed to DIYMA long time ago. If they cancel I'm sure I'll be down there.

D.

[derickveliz2]

Originally Posted by sqcomp

The G is made for a realistic every day driving situation.

I like!


D.

[sqcomp]

Originally Posted by derickveliz2

Thanks I'll put an order for the caps, do you know any web-stores? suggestions?

Exotic materials... mmm all baffles instead of using MDF (L6's, Mids, and Tweeters) Also would like to make a custom grill made of an exotic material for the L6's with the HAT logo. I asked Scott B. if that was ok, he sent me a file with the official logo that I can use.

D.

027-440

DAYTON AUDIO DMPC-30 30UF 250V POLYPROPYLENE CAPACITOR


$8.95 ea

$17.90



027-450

DAYTON AUDIO DFFC-0.01 0.01UF 400V BY-PASS CAPACITOR


$0.74 ea

$1.48

I bought them from Partsexpress. Easy and cheap order.

[derickveliz2]

Some things I've been thinking about it...

Some time ago I fell in love with Time Alignment,
lately I'm drooling Left & Right EQ.

My Midbass love the Subwoofer they compliment each other.

My Mids sound so insignificant... though that's where all the magic happens!

Windshield, screws me up with hundreds of reflections.

Some extra Power from amps make every thing happen.

Deadening and Blocking road/engine noise pays off for a confi. ride

I still tend to tune for the road... isn't that awkward but at the same time makes sense for a long commuter.

A big help for my ears and body to understand how a track should sound like..
Reference! I got my kids a set of drums, now I know how it should sound! We got a big old Piano, and I'm trying to listen to live music as much as I can.

And something I don't do any more... speak on my cell phone without speaker mode, I'm try to avoid the phone over one ear at a time. Sounds stupid but keeps my ears balanced.

Also I'm trying to stay away from earphones! the feeling of the center image going through my head is not what I want/like.

Avoid LOUD music or noise for a long extended period of time.

A song becomes a Good a song when it's well recorded no matter what song is it.

Talking about songs, the other day I was struggling to get the big bass drum
to be right on the center of the stage, until I watched the video from youtube
on my phone and playing a very well recorded track at the same time, guess
what! I found out the big bass drum IS slightly to the right.

- Now every thing makes sense!






D.

[sqcomp]

The only reason I use headphones is to get an idea of tonality.

I'll echo the song to good song thought regarding the recording process.

Extra power makes the difference...now you know why I'm doing what I am with my surfboard amplifiers.

What's wrong with the windshield? :) I relish in reflections! For some reason in my setup it just doesn't sound right unless I'm off axis. It's a phase thing for me.