hey all, just bought a new impreza RS. transfered part of my old system to the new car:
Alpine 7998R HU
MB Quart Premium 16cms up front, Reference 13cms rear
Alpine MRD-F540 (80wrmsx4@4ohm)
Rockford 1 farad digital cap.

Original plan was to have a subless high-end system, but after listening to the system, really miss the lower end, so im putting my subamp back in (Alpine MRD-500).

I also have a single dvc 12" type r sub in a sealed box from the old system, that im thinking wont go too well with the quality of the splits.....was kinda boomy in my old car....so was thinking of swapping to a 10" type r instead...maybe getting a ported box.....
what do u guys think?

besides the lower end (or lack thereof), the rest of the system is real good, have extensively dynamated the car, with dynaxorb pads behind the speakers....

having said all that...i really prefer frequencies from around the 60hz upwards....not into any bass-heavy music.....prefer rock and alternative... like mostly the bass guitar.....would a ported box be what i need?

60hz up would be more or less "mid bass" and your splits should be able to play that frequency.

Sub bass would be around 15-20hz to about 60 -80hz.

How have you set the crossovers with your current set up? Try high passing the splits at 60hz and see how you like it.

And, type of enclosure depends on the equipment.

Bye,
Mo

yar my splits cover covers ard 80hz really well well turned up...and i mean really up....but i just want more volume in that region with normal listening levels....will putting my 12" back in give me any more lower midbass?

mmm... your 12" won't give you more midbass as you 'should' low pass the sub at about 80hz too...

What do you mean when you say you "want more volume at normal listening levels" ?

If you have the sub and amp from your old system, then hook it up and see how it sounds...you could try setting the subsonic filter a bit high like 40hz or something and see if you like it I guess...

Any reason why you don't want low bass (60hz down) in your car? Most of us try to get good low bass...

well maybe its cos i havent heard good clean low end bass.....
like i said...my 12" sounded really boomy......
when i say more volume at normal listening levels, i just mean that i wanna head the 80-120 hz region louder compared to what it is now....
ill just chuck in the subamp and my current sub and play ard...try to get a few diff subs and boxes in there and ill see how it goes i guess....

if i swapped for a single 10", what would i be able to lowpass it at...would it be able to reach into the midbass regions (ard 80hz).
is there a better alternative to the type r that wont totally drain my bank account? like say ard the $500 mark? thx...

I can only suggest the Dynaudio MW-180, its the subwoofer for people who hate subwoofers.

hmm that looks quite good actually....
but 180wrms @ 4ohm?
how much does one retail for? never heard a dyn sub be4...

the Dynaudio MW-180 is a 9.5'' subwoofer and it is 120watt RMS. it retails for appox $400

anyone used these be4?
thx matt......the website says 180wrms though....
where did u get 120 from?

Just so you know , from my experience, frequiencies played above 65 htz become directional. If you have you sub highpassed quite hig you run the risk of dragging your sound stage back, or making ti very apparant you sub is "in the boot" so to speak.

Give Geelong Car Sound a call and ask to speak to ??? (their new custom installer, ex-Freeway) He has had more experience with these woofers than most and can answer any questions you might have. They are also Dyn dealers.

couldnt you use the EQ on the 7998 to boost the 60Hz frequency higher than the rest?

I just got a 7998 myself and dont know alot about how to set it up well yet. I have two type R subs running off an MRDM500 and Boston Rallys running off a PPI 4240 (bridged at 2x120wrms) and also another PPI 4240 running the rears which are just alpine 6". I have the same situation as you in that i want bass guitar and lower stuff to be louder. I didnt really know what frequency they correspond to, i think at the moment my splits are highpassed at 80hz, so i will drop that to 60Hz... and i may end up boosting the 60Hz on the parametric EQ by one or two levels as well. I have slightly cut the treble using the fifth EQ band as well as it gets too ear piercing as the volume goes up

all my amps are set on full range, and im using the headunit to control crossovers as well... is this the best way to do things now my headunit actually has these features?

Time alignment is also on mine... i think the subs are at 1.1ms, RR at .7ms and FR at .9ms with FL and RL being 0. What settings are you using?

Ashleigh is the installers name. You can only EQ so far, if the speaker has limited output excursion wise at 60hz adding EQ will only make it bottom out or otherwise damage itself.

have you looked in to having an 8in sub or maybe 2..
good for midbass and the higher subbass...
which is what your after yeah?

hmm 8 inches huh....cant fit that in cabins, imprezas have pretty small door cavities....boot?
since ive already got an alpine type r....ill chuck it in and try different settings....think ill highpass my splits at 60hz cos apparently the MB quart premiums have quite a decent midbass level....
will lowpass sub appropriately...ard 50hz?
hmm cant remember what my time alignment stuff is....but its fairly accurate as i used a tape measure to measure the exact distance and then used i personalise to calculate the time correction.
really nice decks with good security....mine used to be in a liberty that was broken into, they didnt get the deck ...must have been really dark so they thought there was nothing there.....
anyone noe exactly how low my splits can go?

I think everyone's missed the point a little here.

If you love bass guitar you'll want to go down to 43Hz at the very least. The "boominess" you complained about from your old sub woofer was most likely caused by the massive 80-130Hz cabin gain that occurs in most cars.

These frequencies cause bass to sound "thick" or boomy, not 40-60Hz. There are a lot of mis-conceptions around regarding bass frequencies.

A steeper crossover slope, new box design or new woofer placement can often sort out these problems. Even an 18dB/octave crossover can still leave 110dB+ at 160Hz from your sub.

Phil

thx for the input phil.
now that ive got all my stuff sorted out, i think ill concentrate on tuning a bit more rather than just spending more money on the problem.
hmm speaking of tuning, was looking into those tuning cds like alpine's highway one or first encounter. any other suggestions? just want cds that i can tune the system to and that are really high quality. in WA so if u noe somewhere that i can get them that would be great as well.
thx guys.