Installed PBR300x2 and now questions..
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Cruiser
Joined: Oct 2013
Posts: 245
Likes: 2
From: NE NC
Installed PBR300x2 and now questions..
I installed the PBR300x2 in my 14SGS along with the polk MM651s. I set the gain by turning radio to about 3/4 volume with bass/treble in the middle, 1000hz 0db test tune running with no speakers hooked up, set gain to 28.4vac with DMM. The gain is before the half way (around 4-5). Placed the crossovers inside the speaker pods with double sided emblem tape, used the original grommet from the harness (have to really pull to get that sucker to break free). Hooked up the speakers and this thing really pumps some air out of the speaker grills. The only thing is that I can only turn it up to maybe 5 bars before distortion sets in. Now don't get me wrong, at 5 this thing is cranking out some crystal clear notes with noticeable bass notes which were non existant withstock speakers.
Are my gains set correctly (sq. root of (300x2.7))?
By putting the crossovers in the pods, is it going to hinder the system in any way?
Does the remote wire need to be hooked up? I spliced mine into the power port.
It really is a great sounding system and I hope these mm651s hold up.
Are my gains set correctly (sq. root of (300x2.7))?
By putting the crossovers in the pods, is it going to hinder the system in any way?
Does the remote wire need to be hooked up? I spliced mine into the power port.
It really is a great sounding system and I hope these mm651s hold up.
Thread Starter
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Cruiser
Joined: Oct 2013
Posts: 245
Likes: 2
From: NE NC
Nice to hear you have not had any issues with the Polks. I was kind of concerned at first, but I have 4 of these same speakers in my truck and have no issues. It must be that people aren't setting their gains properly and/or cranking it up too much. I don't know, could have been a bad batch or something. Mine sound great sitting still and at speed with a full face on. Bet it is really loud with a half helmet.
Road Warrior
Joined: Aug 2013
Posts: 1,505
Likes: 31
From: Las Vegas
When I still had the stock head unit, I was told (by UltraNutz) there is no need to hook up remote wire (and did not) . If you want to hook up, splice into running daylight 
or power plug in fairing.
I found a picture of my setting (believe head unit was at volume 12).
just shy of 7... used the 1khz dial in method.
or power plug in fairing.I found a picture of my setting (believe head unit was at volume 12).
just shy of 7... used the 1khz dial in method.
Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
I installed the PBR300x2 in my 14SGS along with the polk MM651s. I set the gain by turning radio to about 3/4 volume with bass/treble in the middle, 1000hz 0db test tune running with no speakers hooked up, set gain to 28.4vac with DMM. The gain is before the half way (around 4-5). Placed the crossovers inside the speaker pods with double sided emblem tape, used the original grommet from the harness (have to really pull to get that sucker to break free). Hooked up the speakers and this thing really pumps some air out of the speaker grills. The only thing is that I can only turn it up to maybe 5 bars before distortion sets in. Now don't get me wrong, at 5 this thing is cranking out some crystal clear notes with noticeable bass notes which were non existant withstock speakers.
Are my gains set correctly (sq. root of (300x2.7))?
By putting the crossovers in the pods, is it going to hinder the system in any way?
Does the remote wire need to be hooked up? I spliced mine into the power port.
It really is a great sounding system and I hope these mm651s hold up.
Are my gains set correctly (sq. root of (300x2.7))?
By putting the crossovers in the pods, is it going to hinder the system in any way?
Does the remote wire need to be hooked up? I spliced mine into the power port.
It really is a great sounding system and I hope these mm651s hold up.
Yes if your gains are set by your calculations above, they're correct.
No the remote wire does not need to be connected. The speaker level inputs to the amp is what turns the amp off and on.
Advanced
Joined: Jan 2014
Posts: 91
Likes: 4
From: Italy
I installed the PBR300x2 in my 14SGS along with the polk MM651s. I set the gain by turning radio to about 3/4 volume with bass/treble in the middle, 1000hz 0db test tune running with no speakers hooked up, set gain to 28.4vac with DMM. The gain is before the half way (around 4-5). Placed the crossovers inside the speaker pods with double sided emblem tape, used the original grommet from the harness (have to really pull to get that sucker to break free). Hooked up the speakers and this thing really pumps some air out of the speaker grills. The only thing is that I can only turn it up to maybe 5 bars before distortion sets in. Now don't get me wrong, at 5 this thing is cranking out some crystal clear notes with noticeable bass notes which were non existant withstock speakers.
Are my gains set correctly (sq. root of (300x2.7))?
By putting the crossovers in the pods, is it going to hinder the system in any way?
Does the remote wire need to be hooked up? I spliced mine into the power port.
It really is a great sounding system and I hope these mm651s hold up.
Are my gains set correctly (sq. root of (300x2.7))?
By putting the crossovers in the pods, is it going to hinder the system in any way?
Does the remote wire need to be hooked up? I spliced mine into the power port.
It really is a great sounding system and I hope these mm651s hold up.
putting the crossovers inside the pods takes away from the actual useable airspace the speakers have to perform within. I'd mount them externally.
Yes if your gains are set by your calculations above, they're correct.
No the remote wire does not need to be connected. The speaker level inputs to the amp is what turns the amp off and on.
Yes if your gains are set by your calculations above, they're correct.
No the remote wire does not need to be connected. The speaker level inputs to the amp is what turns the amp off and on.
but if i have a PBR 300X2 and BT 7.1" what is the gain calculation?
Square root of 300x4 or 200x4?
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Road Master
Joined: Jun 2007
Posts: 1,092
Likes: 35
From: Fl
No need to get too carried away with the gain calculations, IMO. If you use the AC method you should really use the birthsheet wattage results, as this is the real world output of the amp. Mine was 193 watts RMS per channel, way over the nominal rating. I started to do the distortion method to set my gains, but I said screw it and just set it at 7. Guess what, it sounds great!
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Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
200x4 = 800 then sq rt of that is 28.28vac.
Tourer
Joined: Jul 2008
Posts: 436
Likes: 5
From: Northern Virginia
That's what I set mine to as well. I have a question though, I've selected HP vs AP and am wondering if I'm clipping my bass output with this setting? I think I set the frequency to 80 HZ. I'm okay with the sound as it stands but think there could be better bass.
Last edited by Gnarl78; Feb 18, 2014 at 10:39 AM.