Mega Heavy Bass

Thanks mate We don`t have these smileys or icons on the U.K. forums. (Not the ones I visit, anyway) So it was a bit weird for me seing it there. Good to see other people like to drop low bass We have a guy over here who is hitting 152.2dB @20Hz with 10x 12" subs in a ported tunnel (6th Order bandpass). Yet to test another guy called "ICEMAN" (Ian Pinder) apparently his system has been measured in the dB drag position hitting over 155dB @25Hz !!! WOW!! Just looked at all the smileys for this forum. This set is crazy (in a good way).

Hi all. My name is Marcos Barnes and I`m the owner of. www.globalstreetbassers.com and www.streetbassers.co.uk NOTE: GLOBAL is Under Construction Some of you may already know me becuse of the Monsterous Purple Escort that does over 150.0dB @ 20Hz and 155.3dB @ 30Hz Anyway. I`ve had these 187 10" subs since they were released. Somebody has just purchased these and I`m building the box for them. It`s not finished as it need filling and spraying etc. Here`s the SPL results using the ((((Propper Droppers)))) SPL format. The following text has been taken from my forum: Link: or look below: http://streetbassers.co.uk/forum/index.php?topic=2248.0 ----------------------------------------------------------------------------------------------------------------------- Remember this is a box I`d made up for "Halfpintbasser" Contains two 10" Incriminator Audio subs and 800wrms of power The following scores were done without the port blockers. In the boot of my Focus. Only 1dB down from my RF12" with 400wrms less power too, and louder at 20Hz Average=135.0dB 40Hz=137.9dB 33Hz=135.1dB 25Hz=132.3dB 20Hz=132.0dB I had to take off 2" off each end of the box to get it to fit in his car. Chevrolet Laccetti 1.8 Sport. We powered it up, we didn`t use any port blockers, I`m really happy with the scores. Total Average= 136.4dB + 1.4dB Peak=138.7dB @ 49Hz +0.8dB 40Hz=136.7dB - 1.3dB 33Hz=136.1dB + 1.0dB 25Hz=134.9dB + 2.6dB 20Hz=136.0dB + 4.0dB (This is louder than my single 12" and with 400wrms less power) It plays very well. The car needs to be seriously sound deadened though. It rattles like a bag of bones and tin cans I was expecting the scores to drop with the smaller box. But it has increased at nearly every frequency, which surprised me. Makes me want to try the 12" Incriminator Audio 187 series subs. To drop this low in a small box without the use of a port blocker :thumbsup:

^^^^^What`s that supposed to mean then?^^^^^

I`d love to try some of these out. Do you have the TS parameters for them. I`m only interested in a few things. Fs Vas Qts X-max Coil configuration and power handling. Sensitivity

Hey. About the resonant frequency of the car. I don`t think it`s worth bothering with. Is it? I`ve been out of the PEAK SPL thing for a while so I`m quite rusty. I`m not sure if the resonant frequency of the car may be the loudest frequency at the point where the mic is positioned. If I was to do an SPL box I`d get a sealed box - Play a frequency sweep and see what frequency the cars highest dB reading is. Then I`d build a ported box to take advantage of the peak frequency based on the results of the sealed box. The reason I`m saying this is because if you did use the method that I told you about earlier. Your graph within the car will more than likely show a higher dB reading above the cars resonant frequency point. Not sure if you tune to the resonant frequency or tune lower to take advantage of the resonant frequency peak? But if you do the Sealed Sweep test I don`t think you can go wrong...

Funny you should ask that. I`ve been toying with two box sizes for the Focus. I`m sticking with this one for my bigger box. The following box fits in between the parcel shelf and underneath it. There will be approx 2" gap either side of the box between the suspension pillars. These are overal sizes using an 18mm or 3/4" thick wall. 35" wide x 21" high x 17" deep. Giving you a 5.8 Cu.Ft. Box - I`m fitting the amp in the triangular space between the seat back and the box. You can go even bigger though if you mount the amp on the front of the box, facing the tailgate and building into the angled space as well.

Here`s the box details. I`ve used 18mm or 3/4" MDF for the box construction. The box is 3.0 Cu.Ft Tuned to 30Hz The port including the wall thicknes takes up 0.16 Cu.ft. The port size is 12" high x 1" wide and is 11" deep with both ends being gradually flared. This port is finished flush with the front baffle which is two layers of 3/4" MDF thick. BOX Sizes / Internal Sizes. NOTE: Don`t forget I`ve added another layer of MDF to the speaker mounting face, this allows the speakers to look flush fit and also allows a little more length for the port. 35" Long x 12" high x 12 3/4" deep BTW: I tend to keep my ports with as little bends as possible or none. I try to balance my ports so that there`s the best possible port area alongside the best length in which to tune low and still have an extremely good transient response. In your case, if you want SPL you should make the port area as large as possible. By doing this you`ll be tuning the box higher. You can probably widen the port by an inch, keeping the port length the same and see what happens. Bearing in mind that the larger your port the less box volume for your subs.

I don`t know the resonant frequency of the Focus and I wouldn`t bother either as I`m not into building SPL boxes which take into account the peak resonant cabin gain in which to get high SPL readings. I build my boxes to have an extended low frequency response which is always at the expense of a drop in dB. Most focus seem to peak at between 48Hz to 52Hz though. So if you built a box that is tuned to around 35Hz+ that should do quite well in the SPL side of things. To find out what your cabin gain is you can do this: 1:Plot out a graph. 30Hz to 55Hz / 100dB to 130dB 2:Place the sub in a sealed box. In a large open space. (Beside your car will do) Get an SPL meter and place it 1 meter or so away infront of the cone. 3:Play the test tones from 30Hz to 55Hz and plot the spl positions, making sure that you keep the volume settings the same. 4:Now place the sub into the car. Close all doors etc and then test in the same way again. 5:You will notice that at a certain frequency the dB levels will be matched with the outside readings and the inside readings. It`s this reading that should be the resonant frequency of your car. Now you`ve got this frequency you`ll have to build a suitable box to take advantage of this cabin gain as you will not know what to tune to, to get the best out of it. I used to tune 10Hz below the resonant frequency. Test and then cut 1" of the port length and test again. As you keep doing this you`ll reach a peak at which the spl frequency score (your cars resonant frequency)is the loudest. There you go. Hopefully the loudest possible SPL box which takes advantage of your cars resonant frequency. And If like me, you like to drop low bass, then you can always try a port blocker to fill up half the port volume which will tune the box lower and allow the subs cone to be controlled by the port at the lower frequencies.

BTW: We tested using dB drag Rules. Remember this is 800wrms in a 30Hz tuned box. This system hit 140.0dB @52Hz My 12" 2003 Series RF with 1200wrms could only manage 136dB Pooo!

BOOM! BOOM! BOOM! BOOM! BOOM! I hope everyone on here`s fine & getting louder Look what I managed to do this evening. . . . . . . . And then there were FIVE. These are the old 15" mags. Have to start the boot build now, fit the amps etc. But they are going to make some serious noise Thanks for making such an excellent series of subwoofers, guys

The amps are in AMPS!! :bass: AMPS, AMPS!! :bass: More bloody amps!! Set the gains by ear on one sub to Volume 27 out of 42 on the H`U. Then set all the amps to the same setting & wired up everything. Played 20Hz - Turned up the volume to 4 or so and then immediately turned it off. :earmuffs: Can`t wait till Sat - when I do a very quick 20Hz test

19Hz

That`s in dB drag. In ((((Propper Droppers)))) it has done 150.7dB. That`s with the door open and the sensor on the passenger headrest, facing towards the front windscreen. At another event, using a IASCA sensor it hit 151.5dB @ 20Hz! I`m not aiming for huge peak spl figures though. I`m after a system that plays a wide band of frequencies (50Hz to 20Hz) as flat response as possible (Using a ported system) and at levels of over 150.0dB

Hello all. Hope you`re all doing fine I strill haven`t had a chance to alter the Escort install. But I have been messing about with my vectras boot install. Check this out: See this weird box... 6th Order bandpass or simply a tunnel in a boot. This box is far better than any box I have ever made It plays low. It plays loud. It plays a very wide musical frequency with accuracy and is practically flat in it`s overall frequency response. O.K. The system specs. Vectra Sri - Boot System. 1x HMM Box- That`s what I`m calling it - After the ideas from a guy called Henry & Mazdawg & Me making the thing to see what happens. 1x SPLd S-1200d (1200wrms @ 1ohm) 2x Brand new - Stereo Integrity 12" Baby Magnums (500wrms power handling per sub) 1x 70Ah Leisure battery 1x Sony Cheapo Head Unit THE SCORES :thumbsup: Using only 1200wrms of power this system does the following. ((((Propper Droppers)))) Total Average Score = 141.4dB (I`m confident this score will get louder... ) Peak Freeq = 142.8dB @ 22Hz 40Hz= 140.3dB 33Hz= 140.0dB 25Hz= 141.2dB 20Hz= 142.7dB 10Hz= 130.7dB And I tested it using the dB drag rules too. Readings taken from 60Hz downwards + the ((((Propper Droppers)))) SPL frequency format. 60Hz= 138.0dB 55Hz= 140.3dB 50Hz= 141.7dB 45Hz= 141.7dB 40Hz= 140.3dB 33Hz= 139.9dB 25Hz= 137.9dB 20Hz= 136.5dB Is that good stuff or what!!!! ? ? ?

Don`t forget my last ported box need 2500wrms to hit the same sort of dB figures. The ported box never played over such a wide frequency range either. This box is doing more or less identical scores using. Only 1200wrms. Half the power of the previous system!! Over a much wider range of frequencies.

Hello all. Like the new front page Very nice Had a little test at the Talk Audio Guildford Meet on Sunday. With my Vectras rushed boot install. Sorry this is one of my worst ever installs. I`m ashamed to show it. But it is loud!!! Yes that`s an Orion 5000d running @ a 1ohm load to those two 12" Baby Mags. Here are the scores: Peak Freeq = 142.3dB @ 20Hz 40 Hz= 141.4dB 33 Hz= 141.5dB 25 Hz= 141.4dB 20 Hz= 142.3dB Total Average score = 141.7dB Very Happy with those scores :earmuffs: --------------------------------------------------------------------------------------------------------------- As for the Escort. I`ve another 15" Mag on it`s way to me Thanks to Nick & SuperiorSounds. And each of my mags will be run of these amps. I`m altering the wall slightly to acommodate one more 15" sub. It should be as good as I can possibly make it then...

I always measure in the ((((Propper Droppers)))) position - On the passenger Head Rest The driver window was opened half way One 70AH battery. Got rid of that system now. Now using a minimum / very low powered set up... Warning: Another messy install My old Eminence Bass Tube Here are the specs: 1x 12" Stereo Integrity Baby Magnum (Entry Level sub) wired @ 2ohm 1x 1.5 Cu.Ft Sealed Bass Tube. 1x Rockford Fosgate 300.1 (300wrms into 2ohm) Here are the scores: Peaking @ would you believe it. 20Hz :earmuffs: 20Hz= 131.0dB 25Hz= 130.2dB 33Hz= 125.5dB 40Hz= 128.0dB Total Average Score = 129.2dB It does sound pretty good despite the apparent huge dip @ 33Hz. I was pleasantly surprised how loud this set up is. I`m quite happy driving round with this as it is...

Check out these scores Held my 1st official ((((Propper Droppers)))) event this weekend. Sundays event went really well. Look at my results. Taken from my forum: -------------------------------------------------------------------------------------------- :drummer: :earmuffs: I`m very happy with my SPL Testing results Couldn`t stop thinking about it on the way home - big grin on my face. :earmuffs: 1st to hit 150dB+ @ 20Hz in the U.K :earmuffs: I managed to change the speaker wire to 4x runs of 8gauge instead of the two bits of bell wire I was using. I think the tiny bit of extra effort & more wires did good... Mega Heavy Bass - Walled / Extreme Systems. 1: Mega Heavy Bass - 4x 15" Stereo Integrity Magnums - Ported - 1x Adassa Audio Warrior amp 5000wrms Total Average ((((Propper Droppers)))) Score = 150.2dB Peak Freeq= 152.7dB @ 33Hz 40Hz= 150.4dB 33Hz= 152.7dB 25hz= 151.6dB 20Hz= 150.7dB 10Hz= 143.3dB ((((Ground Pounders)))) = 133.9dB U.K.s Loudest Streetbasser Score @ 147.9dB - ((((Propper Droppers)))) @ ((((Ground Pounders)))) scores added up & then averaged out. The only score I`m not happy with is my ((((Ground Pounders)))) score. Last year I was hitting 136.9dB and the sensor was further away & 4 foot off the ground. Again I`ve sort of shot myself in the foot by tuning ultra low. :help: Slow downs will not play in my Changer They play in the H`U` but the vibration causes it to skip. And when I get Woofer Cooker things should be different... I wonder what my scores will be with 10.000wrms .... ---------------------------------------------------------------------------------------- To see the other scores of the day please check this link. http://streetbassers.co.uk/forum/index.php?topic=375.0 As you can see the Stereo Integrity Mags are really proving themselves over here. I`ll post photos when I get some. I didn`t have time to take any when I was there

VOLTAGE is 12v only: The system uses only Three 12v batteries. One of the main problems that I have is with weight. I don`t want to weigh the car down. I`ve already uprated the springs and the car can take 350kg. So that`s why I don`t have many batteries. Also I can`t fit anymore in either. The batteries are Hawker Odessey PC2150. They weigh in at 33kg each. About 70 pounds each in weight. The engine is running when all SPL readings are taken. I`ve had the system playing at very loud volumes for long periods of time. Occasionally turning it up to full whack when required. I only have a 100amp alternator. It`s surprising how loud you can play a system without causing a massive strain on the electrics. SENSOR POSITION: The sensor is placed on the passengers head rest, facing the front windscreen. The passenger seat must match / mirror the position of the drivers seat. The drivers seat must be positioned in the normal position as if you were sitting comfortably / driving the vehicle. The box is 26.5 Cu.ft. Tuned to the Fs of the Sub. The port has only 197 Sq Inches of port area. But half of this is now blocked off so that it play the lows much better. And guess what? The peak SPL score doesn`t drop from its 33Hz peak with either port configuration. Weird. When the car is sealed it reads around 150.3dB @ 20Hz. When you roll down the window about half way the score increases to 150.7 - I`m confident that I can get up to 2dB more at this frequency. If you open the door the score drops to 150dB or less. The scores were done with an Adassa Audio Warlord amp. 5000wrms. And off course those fantastic Stereo Integrity Mags

Thanks guys There`s more to come from those Mags yet... I think someone should start a... ...USA ((((Propper Droppers)))) - SPL testing @ Ultra Low Frequencies League. It will probably do well as an SPL testing format I`ve not done it as a competition format. Although the shops that I hold the events at are giving out prizes for the loudest in several groups. Since it`s not a competition format many normal people seem more inclined to give it a go as they are not up against other people. But what usually happens then is that they try to out do their mates systems. The sensor is placed on the headrest facing the front windscreen. The seats have to be in a normal position as if you were driving the car. You can see by my results that I would have walked away with a sub & about 4 sets of components. Since the shop was giving away prizes for the loudest in: U.K.s Loudest. Walled 20Hz 10Hz Peak freeqs Ground Pounders I kept the sub (New Model Orion HCCA 15") It`s really heavy 36kg !!! The Orion component sets were given out to the next in line. And I gave away a brand new set of Fusion Co-axials to the quietest system of the day. Here`s a graph of my systems performance. My system is far from finished. Once it`s done. I`ll post you some photos.

Oh. I`m officially launching my ((((Propper Droppers)))) SPL testing format in the U.K. this coming weekend. I`ll be running two seperate events. One on Sat & One on Sunday. I haven`t even tested my own system using my own format yet. L.O.L. Anyway I`ll post up the results on Monday

Hello all A very good day today despite not hitting the 150dB @ 20Hz :thumbsdown: Here`s a few photos of my car again. Look!! I actually managed to win a U.K. Finals (I remembered to turn my amps on ) Extreme 3-4 catagory My scores: 152.3dB @ 33Hz :earmuffs: 149.0dB @ 20Hz :earmuffs: (Apparently the dB score drops on grass) Huge drop though But I`m very happy with my scores considering I`m running on half power One thing I have to say is that I will not be competing in Bass Race anymore because I have no chance of getting anywhere. WHY??? Because there are no tunes (that I know off) that peak @ 33Hz for long periods of time But I`m happy trying to hit higher @ low frequencies

Sorry I couldn`t resist. Someone took a very nice photo of my wall. I need a new camera, I think. My main aim is to hit 150dB + 20Hz. I`ve no doubts this system will do it. Especially when they get at least 1500wrms to 2000wrms each... And if you think these subs can`t handle power?... My last system was rated at 6000wrms @ 1ohm (2x Powerbass XA-3000D) and I was running the amps down to 0.5ohm for daily listening. Played for hours - even clipped the subs for a bit & they still keep on taking all I can throw at them. As for how this system sounds? Here`s a few comments. "Listening to your system has made me want to try lower tuning" "I`ve never heard a system play low bass so effortlessly" These comments are from two of the U.K.s Loudest most respected Streetbassers.

I thought I`d put up some scores from different sub set ups which I have tested in my standard 2.5 Cu.ft. box - 4" Aeroport tuning to 27Hz with 1x Directed 1100d amp. Here goes: Stereo Integrity Baby Magnum 12" in ISO: 1ohm Load / 1100wrms Peak= 137.0dB @ 29Hz 40Hz= 134.7dB 33Hz= 135.6dB 25Hz= 136.7dB 20Hz= 133.7dB 10Hz= 127.3dB Total ((((Propper Droppers)))) Score = 134.1dB JBL Isobaric: 2ohm load / 700wrms Peak= 134.8dB @ 33Hz 40Hz= 133.3dB 33Hz= 134.8dB 25Hz= 133.8dB 20Hz= 134.0dB 10Hz= 126.7dB Total ((((Propper Droppers)))) Score = 132.9dB Baby Magnum 12" DVC: 2ohm / 700wrms Peak= 136.9dB @ 46Hz 40Hz= 133.9dB 33Hz= 132.8dB 25Hz= 131.6dB 20Hz= 133.0dB 10Hz= 124.9dB Total ((((Propper Droppers)))) Score = 132.2dB Adassa Audio 12" Prototype QVC: 2ohm / 700wrms Peak= 134.5dB @ 33Hz 40Hz= 130.7dB 33Hz= 134.5dB 25Hz= 131.9dB 20Hz= 131.4dB 10Hz= 125.9dB Total ((((Propper Droppers)))) Score = 131.5dB JBL GT4 12" Normal: 4ohm / 450wrms Peak= 135.3dB @ 46Hz 40Hz= 133.9dB 33Hz= 130.7dB 25Hz= 129.5dB 20Hz= 131.2dB 10Hz= 123.6dB Total ((((Propper Droppers)))) Score = 130.7dB Here are the totals in each SPL league: ((((Propper Droppers)))) - Average Totals 1: 134.1dB - Stereo Integrity Baby 12" - ISO Configuration 2: 132.9dB - Pair of JBL in ISO configuration 3: 132.2dB - Stereo Integrity Baby 12" 4: 131.5dB - Adassa Audio 12" Prototype 5: 130.7dB - Single JBL Peak Freeqs: 1: 137.0dB - Stereo Integrity Baby 12" - ISO Configuration @ 29Hz 2: 136.9dB - Stereo Integrity Baby 12" @ 46Hz 3: 135.3dB - Single JBL @ 46Hz 4: 134.5dB - Adassa 12" Prototype @ 33Hz 5: 132.9dB - Pair of JBL in ISO configuration @ 33Hz 20Hz: 1: 134.0dB - Pair of JBL in ISO configuration 2: 133.7dB - Stereo Integrity Baby 12" - ISO Configuration 3: 133.0dB - Stereo Integrity Baby 12" 4: 131.4dB - Adassa Audio 12" Prototype 5: 131.2dB - Single JBL ((((Outlaw Bass))) - 10Hz : 1: 127.3dB - Stereo Integrity Baby 12" - ISO Configuration 2: 126.7dB - Pair of JBL in ISO configuration 3: 125.9dB - Adassa Audio 12" Prototype 4: 124.9dB - Stereo Integrity Baby 12" 5: 123.6dB - Single JBL You can see by the results which subs or sub set up excel at low frequencies. You can also see which subs have a higher Peak performance And it`s a good way to see how budget stuff can outperform or nearly match even more expensive stuff, even if you have to get two subs to do it. It still costs only

I`m pretty sure I can get them louder. If they were in a standard ported box the Peak SPL score would probably be over 140dB+ But the ISO set up makes them play flatter, louder @ lower frequencies. BTW: The scores are done with the mic in this position. It`s the position I test in for ((((Propper Droppers)))) I have it there because it`s roughly where your ears would be when listening. In the dB drag position I think it would be louder still. When I get the chance I`ll test the system in the dB drag (dash legal position) just to see the difference...