Building Myself a Speaker cabinet.

[MattF]

I would suggest they do. Can you really see them getting a kilowatt RMS out of a 10" square by 2" box? Last one I built was 19" rackmount 4U high, fan cooled. But then, that genuinley COULD fry my dummy load!

They do tend to play with the figures somewhat, dont they. What was the output of that unit? Judging by those case dimensions, it had some serious oomph.

[Apache]

They do tend to play with the figures somewhat, dont they. What was the output of that unit? Judging by those case dimensions, it had some serious oomph.

That was 1000w RMS into 2 ohms. I built it for someone who did open air PA hire. The mains plug got warm if you pushed it hard, and the lights flickered when you truned it on.

Hardcore!!!

12 TO3 mosfets per channel!

[MattF]

That was 1000w RMS into 2 ohms. I built it for someone who did open air PA hire. The mains plug got warm if you pushed it hard, and the lights flickered when you truned it on.

Hardcore!!!

12 TO3 mosfets per channel!

Now that, is an amplifier.

[nero279]

Do they still use PMPO as the standard rating on I.C.E, then?

depends how good it is, RMS is pretty much the norm now in specs, but PMPO is often incorporated into the graphics on stuff, like the JBL sub and amps in the pic earlier in the thread.

Rob, agreed to disagree then:roll:

So back to the original question, now you got the technical bullsh!t, keep the boxes the same size roughly as the boxes the speakers came out of if you still gonna use them. Wiring, who knows? if the amps tri-mode compatible, you can bridge the sub across both channels with a bass blocker in line then, and in addition run one of the mid ranges off each channel aswell, I think, but I can't remember if you can do it like that or not. and I still haven't worked out what load that'll put on the amp. Any thoughts rob or matt or apache?

[MattF]

A horn has nothing to do with piezo technology, but piezos have been used to drive horns.. Horns go way back. I'm talking compression drivers and the big old altec voice of the theater type stuff.

No, you're either referring to I.C.E, or you're referring to true audio equipment. You can't keep changing the goalposts to suit your point. Why would a discussion about large compression units be relevant to a space limited application?

[wishbone]

Depends if the original boxes are sealed or ported. Still a waste of time imo.

Rob.


Run a QSC1850HD for my home subs. 1800W into 4 ohms bridged

http://www.qsc.com/products/amps/rmx/rmx.htm

[MattF]

and I still haven't worked out what load that'll put on the amp. Any thoughts rob or matt or apache?

No idea. Car audio always bores me senseless due to all the weird configs manufacturers insist on using. I only jumped in because someone keeps altering the argument to suit their needs.

[Apache]

depends how good it is, RMS is pretty much the norm now in specs, but PMPO is often incorporated into the graphics on stuff, like the JBL sub and amps in the pic earlier in the thread.

Rob, agreed to disagree then:roll:

So back to the original question, now you got the technical bullsh!t, keep the boxes the same size roughly as the boxes the speakers came out of if you still gonna use them. Wiring, who knows? if the amps tri-mode compatible, you can bridge the sub across both channels with a bass blocker in line then, and in addition run one of the mid ranges off each channel aswell, I think, but I can't remember if you can do it like that or not. and I still haven't worked out what load that'll put on the amp. Any thoughts rob or matt or apache?

Guitar speaker cabinets are a law unto themselves. Some are, or try to be kind of quasi-infinite baffle designs, with often no rear panel at all on a very large cabinet. In car use, well I personally would not bother. They'll likely sound very mid-rangey despite the huge cone size as most have a pretty stiff surround material, usually a doped linen or paper.

If the crossover is designed properly, then the load can be largely dictated by whatever the crossover designer decides, so you could hang as many drivers on it as you like and still end up with something close to your required impedance.

It's a complicated subject, and from what I can see, ICE is all about fairytale type huge powers (probably not physically possible from a car battery) and the biggest cones you can fit inside a Nova. But hey, I'm all for experimentation, so go for it!

[nero279]

No idea. Car audio always bores me senseless due to all the weird configs manufacturers insist on using. I only jumped in because someone keeps altering the argument to suit their needs.

I've not had a good day, so sorry if i've been argumentative.

Summary:

running higher impedance than the amp is stable to is not going to cause damage (i only learnt that from this thread)

running lower impedance than the amp is rated to may well cause damage in the long term or if you driving it hard.

The 15" bass woofer should have a fairly good range, but will probably not reproduce really low frequencies that some car stuff can allegedly get to.

The 2 10" speakers from the guitar amp, will be very much mid range drivers and will reproduce mid range sound rather than bass, athough possibly not with great results if they were taken from an infinite baffle box.
-------------------------------------------------
I agree with rob to an extent in that with what you got it's going to be a lot of work for perhaps not great results to combine the amp/headunit/speakers you got, but we all learn things the hard way and if u wanna put that in your car I will try and advise of the best way to do it.

[wishbone]

No, you're either referring to I.C.E, or you're referring to true audio equipment. You can't keep changing the goalposts to suit your point. Why would a discussion about large compression units be relevant to a space limited application?

Seriously, what 'goalposts' have I moved ?

I mentioned horns and electrostats as an answer to Nero about distortion. I didn't realise that distortion in speakers changed when you sat in a car. You need a reference of what good sound is in order to know whether you have it or not.

He said :

""I'll not go there, but if that's implying i haven't heard 'clean' speakers it's way off the mark. There may be a difference between auible and actual distortion, but at the end of the day if the distortion is so minor that it can't be heard who's gonna know?""

I answered saying he had not heard horns or electrostats.


My only advice in this thread was to sell the various driver on and buy something more relevant to the application.

I don't have any agenda or whatever. I just corrected some wrong information.

btw how the hell could a compression driver be used for sub duty? y

Rob.

[MattF]

I've not had a good day, so sorry if i've been argumentative.

I wasn't referring to you.

[MattF]

btw how the hell could a compression driver be used for sub duty?

I'm not even going to pretend I have the faintest idea where you picked that from.

[wishbone]

The original post was about subwoofers. I mentioned compression drivers in response to your piezo comments, and the comments about distortion. You referred to a space limited application. As this thread is about subs in the back of a surf (being the space limited application) I can't see how my comments about compression drivers can be taken in the context of a 'space limited application' Hence my reply.

Can you shed some light on how I'm moving goalposts please ?

Rob.

[wishbone]

No idea. Car audio always bores me senseless due to all the weird configs manufacturers insist on using. I only jumped in because someone keeps altering the argument to suit their needs.

Example please, and what are my needs?



Rob.

[MattF]

The original post was about subwoofers. I mentioned compression drivers in response to your piezo comments, and the comments about distortion. You referred to a space limited application. As this thread is about subs in the back of a surf (being the space limited application) I can't see how my comments about compression drivers can be taken in the context of a 'space limited application' Hence my reply.

Can you shed some light on how I'm moving goalposts please ?

Rob.

The above is a perfect example of what I mean. I mentioned piezo technology in reference to your comment regarding horns. What the hell has a horn got to do with a sub, then? Also, unlike Nero, I do know exactly what you're talking about. So, either my brain is in slow mode due to being tired, or your posts over the last several pages have suffered more shifts than an epileptic during a fit. You keep fitting the discussion to suit your point. Either that, or all the constant quoting/requoting of text has just bored the $hit out of me so much that I couldn't be arsed to try and read it any further.