34 replies to this topic

[Blackrazor]

Evening all...

After thinking much about what kind of sound i want for the car, i'm tossing up the idea of an ABC enclosure...

Has anyone here used these? And if so, does it behave in all ways the same as a ported box except with a tuning shelf rather than spike? If i tune low (25Hz or less), will it cause the top end to roll off quicker than a normal ported box?

In short, i want to know if it will sound better than a standard ported box given that i have about 120L of boot space available, will be lowpassing the sub at 63hz @ 24dB/o and subsonic highpassing it at 20Hz @ 24dB/o The subs i want to use have a Qts of 0.35, and i plan on using either 2x 10" or 1x 12" subs... if i use the single 12", the drivers Qts on the model i want is 0.25

Cheers for your help and/or suggestions

[eggism]

Have'nt heard one yet but from what people have said they are very very good
but as i said i havent heard one so wont give it my thumbs up yet

[-DJ-]

the appeal of a properly designed aperiodic enclosure (super good transient response read: tigntness/speed) is high.

the complexity and fiddling makes it one for my "too hard" bin, especially in my cramped skyline boot...

d

[gooki]

Hahahaha and you think your boot is cramped - you should see blackrazors. Damn s13 silvias and their mini boots.

[Blackrazor]

Heh, i can fit in 112L, i worked it out yesterday

Remember, when your boot has no other purpose than to house a box, its surprising how much room you have...

On another note Dave, the Silvia has no back seat now, and the MDF is getting cut for the amp mount racks as we speak

[-DJ-]

lol. aaah i see. so basically your car is going to become a mobile stereo with 2 chairs in it!

silvia back seats are virtually useless anyway. ever tried to cram your mates in the back?? lol my mate's s13 and another mate's s15 have rear seats purely for novelty, cos i get out of them with a crook neck... every time.

and damn your boot to hell! its still larger and more practical than mine! *grr*

we want pics when its done!

d

[gooki]

Don't dis the s13 back seats. I teavelled 2500k's with four people in the car (christchurch/auckland return). Admitedly I was the one driving so I never experienced the rear seat.

BR good to see the install is moving along - damn it you're way ahead of me.

[Blackrazor]

Least you got all your gear other than the amp, i've still gotta organise some subs :/

[Blackrazor]

djhatton said:

lol. aaah i see. so basically your car is going to become a mobile stereo with 2 chairs in it!

Bingo :wink: I have a Bluebird too, and the missus uses that and we use it for trips, the Silvia is simply to run to work and back, and to be my SQ wagon

[gooki]

Quote

Least you got all your gear

I think I may have lost my Arvus tweeters - damn it I'm not used to having such small beauties Hopefully they'll turn up when I change house.

[Blackrazor]

gooki said:

I think I may have lost my Arvus tweeters - damn it I'm not used to having such small beauties Hopefully they'll turn up when I change house.

:shock:

:cry:

Man i'd be pissed

[-DJ-]

lol. yeah i lost one dyn crossover for like 3 weeks. turned the house upside down.

.... was in the box :oops: i nearly kicked the neighbours cat when i opened the thing. :x



d

[ferdie]

dude what enclosure sizes and port sizes are u using for the 12"sub only plan? and how do u work it out for this type of enclosure???

[Blackrazor]

I havent finalised the plan yet because i still havent finalised what subs i'm buying, once i decide all that i'll measure it up and post some box schematics for you to have a nosey through

[VL Commy]

i have built a couple of these myself, both with quite nice results. The main issue is see is that u plan to have one part tuned to 25hz, this means your frequency range will only be 25-50hz (admittedly with the rolloff after those freqs, unsure of what the rolloff is like though). I hope the arvus mids like playing low.

A better suggestion might be to tune for a bandpass between 30-60hz as you plan to have the lowpass on 63hz. You will find that the output below the lower tuning is still quiet good without losing control. The box i made for my PG had a bandpass between 38-76hz and sounded pretty good IMO. Better than the old standard ported box anyway.

so you have roughly 4.2cuft for the box? if so thats pretty similar to my old one (4.5cuft total, 1.5cuft & 3cuft chambers respectively)