can the bass boost act as a crude subsonic filter if the amp doesnt have one?


OP
R

realflow100

CarAudio.com Enthusiast
Jan 1, 2019
62
-3
I got a new set of subs cause one of the terminator subs terminals broke when i was moving them to my new box I got tuned 34hz with 1.8 cubic feet per sub with separate chambers

I got some DS18 SELECT 4ohm 12" subwoofers they hit harder and sound cleaner and get louder and deeper too. a fair bit stiffer suspension but they sound much better i gave them plenty of time to break in before putting them in the box. about 3 hours of 20 to 40hz tone sweeps to really work them in.

I need a new more powerful amp though they can still be pushed more. underrated subwoofers. stitched surround. very tall roll surround with high cone area. and even protective rubber boot on the magnet. and they have more beefy terminals too. push/spring terminals. not like the crappy spade/blade terminals that the terminator subs had. they get loud and clean very clean excursion no mechanical noise at all.

 
Last edited by a moderator:

DRBOOM

CarAudio.com Well Known
Nov 21, 2018
249
51
ive not done anything wrong just asking questions  :(
Hey mate, better to ask question if you are not sure, I like people asking questions, as it provides an impression on how everyone thinks! :graduate:

Now, the amp you have does not have subsonic filter so if you are using a sealed box, it maybe be tuned at 35hz (as a good overall sound frequency starting point) so the subsonic filter can be used but will not have any issue with the subwoofer.

The subsonic filter is a good prevention to your subwoofer, think of it as an insurance for your subwoofer and it outshines when you are using a ported box.  Usually they expand from 20hz - 50hz depending on the type of amp, and are set at 25hz as a good measure.   In reality, you cannot get bass lower then 30hz in your car, as the environment will not allow it, but I am sure you have heard people making custom box and tuned it low , say 28hz, but that does not mean, you will get 120db of bass at 30Hz, :uhoh:  as most vehicles peak around 50 -60Hz

The bass boost function is usually centered around 45 Hz that provides a "peak" in that frequency and is used to compensate for your subwoofer enclosure, or placement / efficiency issue., But if you have high sensitivity subwoofers, then using the feature will just 'drown' the midrange/ mid- bass/ and high frequencies and is useful if you are into SPL :nerd:

Keep your eye out for a class D monobloc that you can buy later as its a good feature to have if you have a ported box.  Not having them can reduce the life of your subwoofer in the ported box if you like to 'pound the pavement' but if you listen to it at low to moderate listening levels then its ok, but keep your eyes peeled for one you can get in future.

Hope this gives you some a better understanding of the amps bass boost feature mate! :veryhapp:

20150530_150021.jpg

 
OP
R

realflow100

CarAudio.com Enthusiast
Jan 1, 2019
62
-3
I'm not in a car im in home. everything setup in my bedroom I have no bass boost set. turned off completely.

my box is ported tuned to 34hz and not sealed. it hits down to about 22hz strongly.

my subs do not even get close to bottoming out without subsonic filter. even playing a 20hz sinewave at full volume my subs still have plenty of overhead excursion left. they arent even being stressed when playing music.

they start dropping off in excursion below 20hz and above 20hz without a subsonic filter. only have low pass filter set to 40hz on both subs so they dont play any high frequencies.

even though its tuned to 34hz. it sounds the loudest around 45 to 50hz so i set an EQ on my computer to account for that and reduce the bass around 40 to 100hz and reduce the peak at 45hz by 15dB and 50hz by 18dB to make it sound flatter and less boomy.

my room really resonates loudly around 45 to 50hz it sounds like my head is in the subwoofer port when i stand across the room from my subs unless i have my EQ filter on my computer set to reduce the peak around there. I prefer SQ over SPL so it sounds really good the way its set up right now. i would need a subsonic filter if I got a more powerful amp for sure. the amp i plan on getting rockville dB14 comes with a subsonic filter already so i'll be using that if I give my subs more power.

 
Last edited by a moderator:

shredder2

CarAudio.com Elite
Nov 19, 2017
2,357
265
Az
Ds18 stuff... I think the starter mtx stuff was an upgrade 

Great choice... was that brand recommended somewhere or was it your panacea of knowledge that just moved you In this instance?

2ft3 tuned to 34hz?

Are you sure... those prefabs can be difficult to nail down the tuning on.

Oh well... I'm glad "your room" is doing better

 
OP
R

realflow100

CarAudio.com Enthusiast
Jan 1, 2019
62
-3
its definitely 34hz i tested it playing a sinewave sweep and stepping through the frequencies one by one and its dead on 34hz exactly. works fine!

the MTX subs werent as good. has less xmax. cheaper terminals. more cheaply made. the magnet had sharp jagged raggedy edges on the inside edge of the pole piece and not aligned very well. and the cone was made of a really brittle plastic material to begin with. the center of both dustcaps cracked like 1 inch wide crack within a month or so of having them and i didnt even play them on much power. they had rubber surrounds but the look quite lumpy around the edges when i take the rubber gasket off.

the DS18 seems pretty over-built. stitched surround. extra high roll surround and still having more cone area than the terminator subs. better magnet. even has a rubber boot on the magnet to protect it. much beefier push/spring terminals makes it super fast and easy to hook up to bare wire. and slightly more than twice the xmax rating of the terminator subs.

very clean excursion too. less mechanical noise than the terminator subs.

and with the new box i got they hit lower and cleaner too. and seem like they could take even more power if I got a more powerful amp.


video of the DS18 sub playing. any distortion/clipping you hear is just from the camera mic not being able to handle the bass being so close to the subwoofer.

nvm i fixed the youtube url being posted as a link instead of a video i just changed https to http at the beginning. no idea why it changed it for me.

 
Last edited by a moderator:

Talontsi90

CarAudio.com VIP
Mar 14, 2019
400
25
I'm not in a car im in home. everything setup in my bedroom I have no bass boost set. turned off completely.

my box is ported tuned to 34hz and not sealed. it hits down to about 22hz strongly.

my subs do not even get close to bottoming out without subsonic filter. even playing a 20hz sinewave at full volume my subs still have plenty of overhead excursion left. they arent even being stressed when playing music.

they start dropping off in excursion below 20hz and above 20hz without a subsonic filter. only have low pass filter set to 40hz on both subs so they dont play any high frequencies.

even though its tuned to 34hz. it sounds the loudest around 45 to 50hz so i set an EQ on my computer to account for that and reduce the bass around 40 to 100hz and reduce the peak at 45hz by 15dB and 50hz by 18dB to make it sound flatter and less boomy.

my room really resonates loudly around 45 to 50hz it sounds like my head is in the subwoofer port when i stand across the room from my subs unless i have my EQ filter on my computer set to reduce the peak around there. I prefer SQ over SPL so it sounds really good the way its set up right now. i would need a subsonic filter if I got a more powerful amp for sure. the amp i plan on getting rockville dB14 comes with a subsonic filter already so i'll be using that if I give my subs more power.
Why are you using car amps for home audio?

 
OP
R

realflow100

CarAudio.com Enthusiast
Jan 1, 2019
62
-3
it was the cheapest I could find for the watts at the time. less than 100$ and the power supply for it was only 20$ free shipping on amazon.

but moving up to close to 1000 watts RMS at 2 ohms is much harder to do in home subwoofer audio and find a good deal on that is a good bargain.

 
Last edited by a moderator:

Talontsi90

CarAudio.com VIP
Mar 14, 2019
400
25
Why do you need 1000w in a bedroom? 100w in a good system is enough to make you deaf.

 
OP
R

realflow100

CarAudio.com Enthusiast
Jan 1, 2019
62
-3
I just want to ensure my subs get clean power. plus my room has really bad cancellation below 40hz or room gain around like 50hz in my sitting position so i need alot of power to hit the lows like below 40hz

and i plan on upgrading to better subs eventually when I can too.

below 40hz the bass just sounds like "listening" volume even at max volume. i can have a conversation over the bass if its below 40hz

but around 45 to 50hz it sounds like i have my head inside the subwoofer port.

I feel like i get more low deep bass just sitting my subwoofer on the floor and making the floor vibrate because it removes the cancellation lmao

 
Last edited by a moderator:

shredder2

CarAudio.com Elite
Nov 19, 2017
2,357
265
Az
Idk.. I'd try positioning to get the lows to become more pronounced.

Maybe face the enclosure into a corner with 3-5" of clearance or something like that. 

Your mom has to be living the life with you tucked away trying to seismically dismantle the house.

17hz huh? 

Good luck man... learn to design and construct enclosures 

Best of luck... adding power ain't the solution 

 

Talontsi90

CarAudio.com VIP
Mar 14, 2019
400
25
I just want to ensure my subs get clean power. plus my room has really bad cancellation below 40hz or room gain around like 50hz in my sitting position so i need alot of power to hit the lows like below 40hz

and i plan on upgrading to better subs eventually when I can too.

below 40hz the bass just sounds like "listening" volume even at max volume. i can have a conversation over the bass if its below 40hz

but around 45 to 50hz it sounds like i have my head inside the subwoofer port.

I feel like i get more low deep bass just sitting my subwoofer on the floor and making the floor vibrate because it removes the cancellation lmao
My 75w Logitech 7.1 system gets loud and low and it only has a 5" sub in it. You can hear it outside, feel it throughout the house and can be too loud. How do you know what hertz is playing at the time? are you playing sine waves or have an RTA? Sounds like you are wasting too much time analyzing shit and not enough time enjoying the music. Assuming thats what youre listening to.

 

fithwheel

Member
Dec 8, 2017
960
208
indiana
OP
R

realflow100

CarAudio.com Enthusiast
Jan 1, 2019
62
-3
I cant move anything from where it is. landlord doesnt allow anything blocking easy access to the windows for "safety" reasons. so I cant move everything to where the bass hits the hardest because its right in front of the windows in the opposite corner of my room from where im sitting. my desk is really big. and moving just my subwoofers over there wont help anything because i'll still be in a null/cancellation spot so more power is my only option unless they change their rules about stuff being in front of the windows.

 
Last edited by a moderator:

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.


Users Who Are Viewing This Thread (Users: 0, Guests: 1)



Latest posts

Trending topics

Latest classifieds