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Topic Review (Newest First)

08-18-2012 04:35 PM

BP1Fanatic

Re: Fallen's 2001 Eclipse Build

SQ is right! The ttqwt I have in my ht is off the hook!

08-18-2012 01:14 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by BP1Fanatic

Have u thought about a t-tqwt...revèrse flare th? Less efficient, wider response, & smaller box. I'm thinking about taking out my 15's for a th28 or th26.5.

The T/S params of these subs does not tend well towards transmission lines.

But I though I'd try it out, since I didn't think about doing tappered quater wave pipe. As far as a tapped tapered quater wave pipe, that's going to take a lot of tweaking to get right I'd imagine.

Now I did a quick sim S1=400cm2 (roughly the combined SD of the subs). S2=100cm2, so a 1:4 taper. 160cm long to put the peak right around 38Hz
Ends up taking up half the volume of my current TH. So that's a huge plus.

Now for the down side:

grey is the tqwp black it the th.
I lose pretty much 6dB of output across the board. That's a lot.
It's a smoother response that's for sure. I'm assuming the tapped tqwp would have similar twin peaks, and that it would mirror the original but 3dB down everywhere. Anyways that's too much loss for a smaller box.
Cone excursion isn't improved either, but it isn't really any worse:

The thing to take back from this is the tqwp causes a pretty big impedance missmatch between the air and rear of the speaker. Which is the opposite of what we want to do for SPL. We want a good match so that we can transfer as much power as possible.

Where tqwp shine is for SQ applications where you want to minimize the rear wave (preferably eliminate it) and minimize reflections. This is more important for full range speakers, not subwoofers.

At least that's my take on it

08-18-2012 12:02 PM

BP1Fanatic

Re: Fallen's 2001 Eclipse Build

Have u thought about a t-tqwt...revèrse flare th? Less efficient, wider response, & smaller box. I'm thinking about taking out my 15's for a th28 or th26.5.

08-10-2012 07:43 AM

Fallen

Re: Fallen's 2001 Eclipse Build

Argh a DD M4A BNIB is on sale for $1300 locally. Must resist urge to pick it up.
I would run it at 4 ohms lol. Then I can just keep adding more subs and never need to buy a new amp bwahaha.

(Seriously considering shipping and brokerage, that's not a bad price even if I'm using 1/4 of it's potential)

07-04-2012 07:41 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Well this weekend I got my DEH-80PRS installed.
I also got my little rockford fosgate PBR300X4 installed.
I love that it's rated at 4 ohms, and not 2 ohms

75Wpc at 4 ohms is just gravy. I put it where the stock infinity amp was. I recycled the stock wiring for now. I'll probably upgrade that later. I just didn't want to tear anymore of the car apart o.O

Some wicked carnage lol.

06-09-2012 12:04 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by cxa0897

Yayyy, now I know ill be louder

Edit. Can you spend a tad of effort on flattening the response? I'm thinking very hard about removing seats and doing a horn for the trio

I just went and sealed the front panel up with some foam tape. There were some leaks before. Doesn't sound like it made a difference. (no more leaks, but from the drivers seat it sounds the same lol)

Anyways I could try using fiberglass to line the throat of the horn. But right now, I don't really want to go through the effort.

I think I'm going to make the box smaller, so I don't want to put too much effort into this box

Interestingly enough, doing it with 3 speakers across should flatten it out a bit. If you think of it, from the inner most (left most in the pic below) the L23 will be roughly 18" shorter than the L23 of the outtermost. Having 3 would exagerate the effect, and I'm fairly certain it would cause the dip to be filled in. But I could be wrong. With hornrest it justs sums the areas of the 2 drivers to make one big (circular) driver, whereas with the 2 side by side their width is much more than their height. Hopefully it makes sense.

06-09-2012 09:56 AM

Fallen

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by 666WMD

That's cool but that sucks. That sucks. That sucks. That's interesting. That sucks. That's an idea. Could be useful.

Bwahahaha

06-09-2012 07:30 AM

49konvict

Re: Fallen's 2001 Eclipse Build

just use the v2's for killer midbass.

06-09-2012 06:57 AM

666WMD

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by Fallen

Well I got a new job a couple weeks ago, so I haven't had much time for audio.

Anyways I'm giving up on repairing my bxi2006. There is something going on that I can't measure. I replaced the output FETs and the PSU FETs, checked for shorts everywhere I could think. It still ends up smoking the PSU. So now I think there's an issue with the PWM board that drives the PSU FETs. Something is causing them to switch on and stay on. At this point though, I don't want to put any more money into it. A hundred bucks of FETs is enough for me.

So I'll just be using a bxi1606 from now on. A little less power than I wanted, but oh well. (the amp is also noisy, and in pretty rough shape so it may get replaced soon anyways)

I've worked out a new box design, similar to my last tapped horn but lower profile. It's a little less efficient, and I've increased the low end extension on it a bit. I'm probably going to use plywood to make is as light as possible. Current box is really slowing my car down.

I'm also tempted to do a 180, and put one of my 15s in my spare tire well and run is sealed lol. That would give me a lot of trunk space back.

Hmmmm

That's cool but that sucks. That sucks. That sucks. That's interesting. That sucks. That's an idea. Could be useful.

06-09-2012 06:37 AM

Fallen

Re: Fallen's 2001 Eclipse Build

05-22-2012 03:49 AM

Fallen

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by cxa0897

Yayyy, now I know ill be louder

Edit. Can you spend a tad of effort on flattening the response? I'm thinking very hard about removing seats and doing a horn for the trio

I'll give it a shot.

05-20-2012 12:50 PM

cxa0897

Re: Fallen's 2001 Eclipse Build

Yayyy, now I know ill be louder

Edit. Can you spend a tad of effort on flattening the response? I'm thinking very hard about removing seats and doing a horn for the trio

05-20-2012 12:28 PM

Fallen

Re: Fallen's 2001 Eclipse Build

I think I'm going to build a different box. This one takes up way too much space.
This weekend has made that painfully obvious.

05-16-2012 06:44 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by cxa0897

still looks like it hits pretty well. 6db is a major null though...sure that is noticeable

That it does. And it is noticable, yeah. I wouldn't say it sounds bad. I kinda prefer it to the bloated low end most ported setups have. It sounds a lot more like my home theater. Minus the extension down to 20HZ lol. But for music that extension isn't totally needed.

So anyhow, I'd say the box is a success. But I wouldn't say it's necessarily better than a regular ported box.

Also I'm going to play with the subsonic a bit. I have it turned up pretty high to protect the subs from over excursion. It might actually be cutting into my low end. Thinking about it, I just set it by ear. It could be set to 35Hz for all I know.

05-16-2012 05:28 PM

cxa0897

Re: Fallen's 2001 Eclipse Build

still looks like it hits pretty well. 6db is a major null though...sure that is noticeable

05-16-2012 04:45 PM

SINTORMAN

Re: Fallen's 2001 Eclipse Build

car wash videos is where its at

05-16-2012 04:44 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Went to the car wash to make a vid for you guys.
Probably shouldv'e washed the car first, but meh.

After a wash, clay bar and wax

And here is a little vid for you guys. It's not done uploading as of now, but eventually the link should work. Let me know what you think.
Eclipse Horn.wmv - YouTube

05-16-2012 01:24 PM

Fallen

Re: Fallen's 2001 Eclipse Build

NVM that response is peaky. I shouldn't have started the plot at 20dB.
It makes the 6dB null around 55Hz not seem as bad as it was.

Anyways still not as bad as predicted. But not stellar either.
Now I need to figure out what kind of SPL this thing is capable of.
Since the low end is lacking, SQ is kinda lacking, and it's taking up 75% of my hatch.
I'm not really keen on keeping this box.

Edit:

Pics and vids to follow
To the carwash!

05-16-2012 01:02 PM

REDLINE

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by Fallen

I was kinda holding out until I get my BXi2006 repaired.
But I'll see what I can dooooooo

no more holding out...i want to see it tooooo...lol...

05-16-2012 12:52 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Alrighty. I finally got of my ass and made a measurement

Not too shabby. Like I mentioned before, the peaks and nulls are never as bad as predicted. They did get smoothed out like I expected.

That said the LF extension isn't as good as I had hoped. Down 3dB at about 35Hz or so. That said, it's not really a fartbox or anything like that.

Now I'm thinking what I perceived as it being "peaky" was actually the lack of bass below 35Hz. Coming from a ported box tuned to 35Hz (thus having lots of output there) the peak at 70Hz would be quite noticeable. Since the ported box before this had pretty un-stellar output up around 80Hz.
Anywho a fairly decent response. I have no idea how much power this is. I just increased the level on my deck until I got to around 125dB, since the mic tops out at 127dB. I didn't want to clip the mic.
Edit:
This is not smoothed at all. It is 1/24th octave resolution, which is quite high. If I drop it down to say 1/3 octave like a lot of manufactures use, it looks much nicer :P

05-16-2012 06:29 AM

Fallen

Re: Fallen's 2001 Eclipse Build

Quote:

Originally Posted by cxa0897

vids of the hornnnnnnnnnnnnnn

I was kinda holding out until I get my BXi2006 repaired.
But I'll see what I can dooooooo

05-14-2012 07:54 AM

cxa0897

Re: Fallen's 2001 Eclipse Build

vids of the hornnnnnnnnnnnnnn

05-14-2012 07:42 AM

Fallen

Re: Fallen's 2001 Eclipse Build

Well hopefully someone learns from my mistakes. IT turns out there is a short in the output devices. They all look prestine. I'm a moron for assuming they were fine.

So once I get them all replaced (Hopefully I have spare parts on hand...) it should work.
I'm going to check the drive transistors on the driver board, since they could have caused the failure.

It's weird, I mean it was at 2 ohms. I don't get why it failed. Here's hoping I find a solder ball or something lmao.
Argh.

05-13-2012 09:14 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Argh repairing the BXi2006 isn't going to well.
Replaced all the PSU FETS, powered it up, and blew one within seconds.
(it was clamped to the heatsink. No load connected.)

So anyhow now I'm going to be removing the rectifiers to see if the output FETs are shorted or something. That would explain why the PSU fets blew. It could also be shorted transformer winding or the PWM drive board could be farked. I replaced a blown smt BJT on that board, so there could be damage to the drive IC. I sure hope not.

Ugh. I hate troubleshooting.

05-10-2012 06:38 PM

Fallen

Re: Fallen's 2001 Eclipse Build

Woot woot at 60Hz I can get a pretty good voltage out of my BXi1606

(that would be 2kW into 1 ohm, except that the impedance isn't 1 ohm at 60Hz

)

I cut my testing a little bit short, as it was late and noisy lol.
Edit:

The sticky note was me trying to figure out the gain on the volume control of the deck.
Looks like I won't be turning it up past 23, else I risk clipping the amp.(really doubt it could keep the 63vpp up when the impedance drops closer to nominal)

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