84 replies to this topic

[RustyFuknut]

Spotted this one on car audio direct...

http://www.caraudiod...d1ba7d0399c37b1

its 300W less than the one on ebay and its under the "multi channel" parts of the amplifier section? what exactly do they mean by multi-channel? take a looksy, sorry for my noobishness hehe.

Tom

[philster]

You can turn speakers upside down that are non directional, these are basically subs.

With a sub the position, angle or the way its fitted on the box isn't as crucial as a midrange or tweeter.

The mids and tweeters should ideally be firing at you from in front (at ear level is ideal but not really possible in a car) and should be the same distance from each ear to acheive near perfect sound. They should not be obstructed in any way.

Obviously in a car this is hard to achieve, so people mess around with the angles of speakers and even phasing to acheive as good a sound as possible. You can have the speakers at ear level, firstly because there is nowhere to mount them and also because you will end up with one speaker a lot near to your head than the other (left and right).

If you want an example of how bad an inverted midrange or tweeter will sound put you hand over the front of the grill on your pc speakers and play some music, it will sound muffled because the sound is being obstructed.

could you not mount them like this with some sort of build to get enough depth, you can get some speakers which are really shallow.

Attached Files

•  speakerscage.jpg   140.63K   15 downloads

[RustyFuknut]

ahhhh yeah! I can clearly see the difference between them now

Tom

[RustyFuknut]

Thanks alot for taking the effort to draw a pic!

I only wanted to turn the rears upside down, do you think this would be a problem? if it is il figure some way of mounting them differently

what you drew is pretty much the same thing I was thinking for the front, they will be pointing down slightly though, will that matter at all?

The componant system you suggested would be a bit too big, would it be ok using the same system, but the 5" JBL one? its on car audio direct. looks the same as the other one but smaller.

Thanks again

Tom

[RustyFuknut]

Just a quick pic I threw together in paint



This is the sort of thing Im going for, obviously theres another speaker on the left but I cant draw it in paint lol.

anyone see any flaws in the plan at all?

Id like to turn the speakers upside down too if poss?

Tom

[miniboo]

like philster said you can only turn the subs upside down.

bass is omnidirectional.

The smaller speakers produce directional sound, and the actual music coming from the speakers travel a smaller distance, and are also affected by seats etc being in the way.

Subs with there low frequencies will go through the seats.

Basically you cannot turn the small speakers upside down and get a good sound out of them.

Higher frequencies=directional and short distance
Lower frequencies=Omnidirectional and longer distance

[RustyFuknut]

gotcha, will think of how to sort this out then

the subs would look pretty cool upside down, would 2 free air subs work in those positions? and what sort of sound would it give me?

Tom

[mini_basser]

If you have a box like there, then free air subs wouldn't make any sense

However, the volume of the box is very important!

[Clubby1275GT]

plus if ur gonna put speakers in the same box as2 subs then DONT! the bass from the subs will blow the speakers clean out or jsut have the speakers vibrating in the same way as the subs, hence no point in them being there, ur gonna need to seal 'em off from the sub, like build a box behind the speakers for example.
my mate did the same and without screwin 'em in turned it on and his speakers shot out of the holes!

[philster]

yeah the subs need to be in a seperate enclosure to any other speakers.

you need to calculate the exact volume of the enclosure also for the sub to operate correctly, using a sealed enclosure (without ports) is the easiest option (and uses a smaller box), you can port the box but it generally makes the box quite large and is harder to do (porting is an exact science, get it right you'll be laughing but done wrong it will sound rubbish)

[RustyFuknut]

would it be better to put both the subs in a single enclosure together or seperate it in 2 for each sub? Ill get some exact measurments and work out the volume, Im worried that there may not be enough room in the box? if there isnt, do I have any other options?

Does anyone know how to work out the volume of a box that sort of shape? Im hopeless!

Thanks again for the help.

Tom

[philster]

I can work out the volume if you like, the sub should come supplied with recommended enclosure volumes (in cuFT or litres), if not it will be supplied with a list of parameters that i can enter to calculate the volume.

I prefer to put subs in seperate enclosures to each other but they can go in the same.

[RustyFuknut]

I found a volume calculator on the net and it looks like Ill have plenty of room, I guessed the measurements but even i overestimated the size by quite alot it seems they will still have enough room, Ill make sure each one has the right enclosure and seal them off seperatly if that will give me better sound.

Do you think that 2 10" subs would be the way to go?

Do you know any good rears that I could use?

All the best

Tom

[mini_basser]

I think 2 x 10"s in the right size box with a decent amount of power would do you fine in a Mini

[philster]

and i wouldn't bother with any rears if you are fitting speakers up front.