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Old 08-13-2017, 05:20 AM   #1
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Default Question about bass boost setting on subwoofer amp

Hey guys been trying to tune in my subwoofer on my boat, it's a Wet Sounds HT-2 bridged powering a Revo 10" free air subwoofer. I currently have my gain set where I want it and my frequency set good too. It's on low pass (obviously) but I have the bass boost off because so many people say that's how to do it. The dilemma I'm facing is this, when I turn on my radio and I get some tunes going I don't really feel the woofer even at higher volumes. I started tinkering with the head unit (PRV450) in the settings and I have the sub gain up and the bass setting at a 0. Once I turned it up a few notches on the bass setting I could finally hear some good bass bumping in. Only problem is it's making my Revo 6.5's increase their little bit of bass too and I'm afraid of messing them up. The Revo's are on their own HTX 6 amp and I really like how they sound where they're set at. Would increasing the bass boost substitute what the head unit can do? Or am I being WAY too paranoid about my 6.5's. Thank you for the help.
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Old 08-13-2017, 06:16 AM   #2
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The PRV450 should let you increase sub volume independent of the speakers. "BASS" adjustment will affect both and should be left at 0. Look for Sub volume output.

You also should be able to set a high pass filter on the speaker frequencies through the PRV450 so that the sub handles all the bass and the speakers handle the rest. Start at 80Hz and adjust as needed.
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Old 08-13-2017, 07:02 AM   #3
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Here's why you should not use the subwoofer amplifier bass boost feature. 1) The best of 10" subwoofers are already at one/half power at 50 Hz, which means they are well into their natural roll-off. The center frequency of the bass boost is just below the subwoofer capability. You will expend an inordinate amount of power to get the slightest improvement in that range. 2) A free-air woofer is limited in under-control excursion. Bass boost means excessive excursion. 3) Bass boost invites product failure. So with a free-air 10" subwoofer (any model of any brand) in an open-air scenario, you must reconcile that you have limitations and it will not sound the same as a 10" subwoofer in your car. Keep this in mind. There are three primary issues that restrict the upper range of a subwoofer. A) localization, which begins about 150 Hz. B) vocal fundamentals, which begin about 150 Hz. C) stereo information, which begins about 150 Hz. While 150 Hz. would certainly be an abnormally high crossover setting for subwoofer and coaxials, it is simply an illustration that you can run the crossover frequency higher. If you are running a subwoofer then it is very important that the coaxials are also operating in the high-pass mode, and usually at a symmetrical frequency. The source unit bass tone control has a curve that is a gradual octave to octave change and is shelved in a manner that is much safer for the subwoofer. Typically you only have the luxury of a modest increase in bass contour before things get muddy sounding. Again, back to the understanding that you are working within limitations.
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Old 08-13-2017, 08:37 AM   #4
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Originally Posted by Ruxin View Post
Hey guys been trying to tune in my subwoofer on my boat, it's a Wet Sounds HT-2 bridged powering a Revo 10" free air subwoofer. I currently have my gain set where I want it and my frequency set good too. It's on low pass (obviously) but I have the bass boost off because so many people say that's how to do it. The dilemma I'm facing is this, when I turn on my radio and I get some tunes going I don't really feel the woofer even at higher volumes. I started tinkering with the head unit (PRV450) in the settings and I have the sub gain up and the bass setting at a 0. Once I turned it up a few notches on the bass setting I could finally hear some good bass bumping in. Only problem is it's making my Revo 6.5's increase their little bit of bass too and I'm afraid of messing them up. The Revo's are on their own HTX 6 amp and I really like how they sound where they're set at. Would increasing the bass boost substitute what the head unit can do? Or am I being WAY too paranoid about my 6.5's. Thank you for the help.
I personally never set up a sys using bass boost. There are other aspects that may be causing the issue. Where is gain set on the ht2? How and where is sub mounted. You say you don't "feel" the sub. That says a lot about how it's mounted and of course where. Tell us those two things and the answer may lie there.
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Old 08-13-2017, 11:46 AM   #5
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Here's why you should not use the subwoofer amplifier bass boost feature. 1) The best of 10" subwoofers are already at one/half power at 50 Hz, which means they are well into their natural roll-off. The center frequency of the bass boost is just below the subwoofer capability. You will expend an inordinate amount of power to get the slightest improvement in that range. 2) A free-air woofer is limited in under-control excursion. Bass boost means excessive excursion. 3) Bass boost invites product failure. So with a free-air 10" subwoofer (any model of any brand) in an open-air scenario, you must reconcile that you have limitations and it will not sound the same as a 10" subwoofer in your car. Keep this in mind. There are three primary issues that restrict the upper range of a subwoofer. A) localization, which begins about 150 Hz. B) vocal fundamentals, which begin about 150 Hz. C) stereo information, which begins about 150 Hz. While 150 Hz. would certainly be an abnormally high crossover setting for subwoofer and coaxials, it is simply an illustration that you can run the crossover frequency higher. If you are running a subwoofer then it is very important that the coaxials are also operating in the high-pass mode, and usually at a symmetrical frequency. The source unit bass tone control has a curve that is a gradual octave to octave change and is shelved in a manner that is much safer for the subwoofer. Typically you only have the luxury of a modest increase in bass contour before things get muddy sounding. Again, back to the understanding that you are working within limitations.
This makes complete sense to me. I do have all the coaxial speakers at high pass and they are set at the same frequency. I guess I don't know why increasing the bass setting on my head unit yields more results than the subwoofer gain settings. But if it's ok to put it at a +2 then I will leave it there I just don't want to risk damaging the speakers when I installed the subwoofer for the purpose of handling the lows the 6.5's can not.
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Old 08-13-2017, 11:53 AM   #6
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I personally never set up a sys using bass boost. There are other aspects that may be causing the issue. Where is gain set on the ht2? How and where is sub mounted. You say you don't "feel" the sub. That says a lot about how it's mounted and of course where. Tell us those two things and the answer may lie there.
The gain is about half way up, filter frequency is around 100 and there is 0 bass boost. Set on low pass too. The subwoofer is mounted on the port side of the boat in the gunnel. I have speakers located in the back, center console, and bow. I guess what I'm looking for was some hard thump and I can get that thump from that sub but only when I increase the bass setting on the head unit. There is a setting for subwoofer gain also and while it does work it seems the bass setting does more but the 6.5's also increase what little they can do and I'm afraid of causing myself issues with them. I might be paranoid and I want to increase the bass setting to a +2 out of 7 on the head unit. Dont get me wrong even with the bass setting at 0 you can tell the sub is there but I'm just trying to learn how to manipulate the sound better if I want to. Thank you and sorry for the late response I'm coming off my night shifts.
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Old 08-13-2017, 11:58 AM   #7
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Look for a speaker setup page on your head unit. Set the speakers to have a high pass filter to block the frequencies under that filter. This will protect your speakers and ultimately lead to better sound. I don't know that head unit but i'd be surprised if it doesn't let you set a high pass filter.
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Old 08-13-2017, 12:16 PM   #8
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Look for a speaker setup page on your head unit. Set the speakers to have a high pass filter to block the frequencies under that filter. This will protect your speakers and ultimately lead to better sound. I don't know that head unit but i'd be surprised if it doesn't let you set a high pass filter.
Good idea I'll check that out as well.
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Old 08-13-2017, 03:08 PM   #9
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Originally Posted by David Analog View Post
Here's why you should not use the subwoofer amplifier bass boost feature. 1) The best of 10" subwoofers are already at one/half power at 50 Hz, which means they are well into their natural roll-off. The center frequency of the bass boost is just below the subwoofer capability. You will expend an inordinate amount of power to get the slightest improvement in that range. 2) A free-air woofer is limited in under-control excursion. Bass boost means excessive excursion. 3) Bass boost invites product failure. So with a free-air 10" subwoofer (any model of any brand) in an open-air scenario, you must reconcile that you have limitations and it will not sound the same as a 10" subwoofer in your car. Keep this in mind. There are three primary issues that restrict the upper range of a subwoofer. A) localization, which begins about 150 Hz. B) vocal fundamentals, which begin about 150 Hz. C) stereo information, which begins about 150 Hz. While 150 Hz. would certainly be an abnormally high crossover setting for subwoofer and coaxials, it is simply an illustration that you can run the crossover frequency higher. If you are running a subwoofer then it is very important that the coaxials are also operating in the high-pass mode, and usually at a symmetrical frequency. The source unit bass tone control has a curve that is a gradual octave to octave change and is shelved in a manner that is much safer for the subwoofer. Typically you only have the luxury of a modest increase in bass contour before things get muddy sounding. Again, back to the understanding that you are working within limitations.
So if bass boost is bad because fa speakers can't efficiently play below 50hz, does that mean a subsonic filter would be beneficial to a fa sub? And if so, where would you set it?
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Old 08-13-2017, 04:17 PM   #10
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So if bass boost is bad because fa speakers can't efficiently play below 50hz, does that mean a subsonic filter would be beneficial to a fa sub? And if so, where would you set it?
Actually there is not much difference between the low frequency extension of a good infinite baffle 10" and a good air-suspension 10". However, air-suspension (small sealed box) is a more linear method of controlling the woofer's resonance and will yield greater excursion and greater output. The "Bass Boost" EQ circuit found in most amplifiers won't be useful to either type subwoofer in an open-air boat and should be avoided. A subsonic filter, while not crucial, could be useful for either type subwoofer. Bass-reflex is definitely the loading system that will benefit the most from a subsonic filter.
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Old 08-14-2017, 06:14 AM   #11
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The gain is about half way up, filter frequency is around 100 and there is 0 bass boost. Set on low pass too. The subwoofer is mounted on the port side of the boat in the gunnel. I have speakers located in the back, center console, and bow. I guess what I'm looking for was some hard thump and I can get that thump from that sub but only when I increase the bass setting on the head unit. There is a setting for subwoofer gain also and while it does work it seems the bass setting does more but the 6.5's also increase what little they can do and I'm afraid of causing myself issues with them. I might be paranoid and I want to increase the bass setting to a +2 out of 7 on the head unit. Dont get me wrong even with the bass setting at 0 you can tell the sub is there but I'm just trying to learn how to manipulate the sound better if I want to. Thank you and sorry for the late response I'm coming off my night shifts.
A big problem we find is that subs are mounted in fiber glass that has to much flex. This flex counter acts the sub. You are putting a good amount of power to that sub. I would check how much flex is in the glass. You could see a good increase in bass reproduction with a backing plate.
Anywho just a thought.
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Old 08-14-2017, 06:22 AM   #12
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A big problem we find is that subs are mounted in fiber glass that has to much flex. This flex counter acts the sub. You are putting a good amount of power to that sub. I would check how much flex is in the glass. You could see a good increase in bass reproduction with a backing plate.
Anywho just a thought.
And a very valid thought. I use the leg press method (easy does it). If I can sit down and press against the subwoofer mounting surface and cause it to flex, then I know it requires reinforcement. Any movement in the mounting baffle dissipates energy that instead should be displacing air.
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Old 08-14-2017, 06:39 AM   #13
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It's pretty solid where it is, I was concerned about the placement also so I really checked a few spots to put it where I wanted it. The more I listen to it the more I appreciate the bass it has, I don't think by turning up the bass setting on my head unit to a +2 will cause any damage to the 6.5's since they're not even reaching near their peak watts. If I discover anything I'll get back in here and let you guys know.
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Old 08-14-2017, 07:13 AM   #14
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It's pretty solid where it is, I was concerned about the placement also so I really checked a few spots to put it where I wanted it. The more I listen to it the more I appreciate the bass it has, I don't think by turning up the bass setting on my head unit to a +2 will cause any damage to the 6.5's since they're not even reaching near their peak watts. If I discover anything I'll get back in here and let you guys know.
By increasing the setting there you are increasing the voltage to the amp. Achieve the same affect by increasing gain on amp.
How did you tune the sub? What VOL level on HU was used to tune?
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Old 08-14-2017, 09:35 AM   #15
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I turned everything down on my amps to 0 and turned the radio up to about 3/4 of its capacity and started tweaking from there. I have more room on the amp gain on my H/U is it safe to run it closer to the max? I'd prefer to do it that way than to run the bass setting up all the way around
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Old 08-14-2017, 10:03 AM   #16
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I turned everything down on my amps to 0 and turned the radio up to about 3/4 of its capacity and started tweaking from there. I have more room on the amp gain on my H/U is it safe to run it closer to the max? I'd prefer to do it that way than to run the bass setting up all the way around
Without having the equipment to do perfect you can raise the gain until you hear the sub distort. A sub can handle more dist then a coax, around 10%, so play with it. The HU should stay at 3/4 as any more then that and its clipping. Also that HU doesnt have much out put voltage so I would expect gains to be up.
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Old 08-14-2017, 10:30 AM   #17
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Without having the equipment to do perfect you can raise the gain until you hear the sub distort. A sub can handle more dist then a coax, around 10%, so play with it. The HU should stay at 3/4 as any more then that and its clipping. Also that HU doesnt have much out put voltage so I would expect gains to be up.
Ok I will continue to tweak it on the subwoofer. I think I can get some good results by adjusting the gain some more and working with my head unit settings to get where I want to be.
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Old 08-14-2017, 05:49 PM   #18
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well I solved my problem. I don't even want to explain what I did since you guys would probably wonder if I was incompetent but I got the correct gain dialed in and it's amazing. Wife said the side of the house rattled. I'm happy now.
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Old 08-14-2017, 07:24 PM   #19
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I think you should let us know. I promise not to judge.
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Old 08-14-2017, 07:42 PM   #20
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well I solved my problem. I don't even want to explain what I did since you guys would probably wonder if I was incompetent but I got the correct gain dialed in and it's amazing. Wife said the side of the house rattled. I'm happy now.
Did you turn the gain down?? Worked for me.
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