RF PBR300X2 Speaker Pairing
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Joined: Jan 2013
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From: Jacksonville, FL
RF PBR300X2 Speaker Pairing
I've been reading a lot of the threads through here lately and they all seem to talk about how great the PBR300X2 is, however looking at the specs, outside of the BT7.1s it really doesn't look like there is much that can handle it at 2, or even 4 ohms without being overpowered. I'm sure I am completely missing something really obvious here, but are which speakers are people running with this amp outside the BT ones that are not at risk for getting nuked by the amp?
Thanks for the help, I am always impressed by the knowledge in this section!
Thanks for the help, I am always impressed by the knowledge in this section!
Road Warrior
Joined: Aug 2013
Posts: 1,505
Likes: 31
From: Las Vegas
there is a difference between max RMS power and what you send to the speakers... aka Volume.
I ran PBR300x2 in combo with M651, no issues (still got the MMs). got SS4/520 now.
you can always dial the gain back, see many many threads regarding how to calculate the ac voltage at the speaker output of the amp using UltraNutz 1kHz test signal.
example with stock HU(up to 2013): set volume on 12-13 bars of the 17 (that is roughly where the HU starts to distort; although some say it will sooner). mow play the test signal and dial the gain in to where you will see 28.5v AC (this is for MM651s on a PBR300x2!!!!!) on the meter connected to the speaker output. NO SPEAKERS CONNECTED!!!!!!
if it makes you feel more comfortable, just dial back the gain.
yes, if in the example above, you would push the volume all the way to 17 bars and amp dialed in to the 12-13 bars (aka 28.5v), you would push more input signal to the amp, therefore more out of the amp (up to RMS max level) and thus potentially overpowering the speakers (and perhaps the amp as well). keep in mind speakers are also rated for max power (short power "burst"). BTs as well as MMs are rated max power beyond the what the amp can send.
TBH, I never ran the volume up to 12-13 on the stock HU or in my new set up (volume max 60; dialed in to 40) over 33-ish.
the experts here (UN, Pioneer74, GP) will comment on above, I am sure
I ran PBR300x2 in combo with M651, no issues (still got the MMs). got SS4/520 now.
you can always dial the gain back, see many many threads regarding how to calculate the ac voltage at the speaker output of the amp using UltraNutz 1kHz test signal.
example with stock HU(up to 2013): set volume on 12-13 bars of the 17 (that is roughly where the HU starts to distort; although some say it will sooner). mow play the test signal and dial the gain in to where you will see 28.5v AC (this is for MM651s on a PBR300x2!!!!!) on the meter connected to the speaker output. NO SPEAKERS CONNECTED!!!!!!
if it makes you feel more comfortable, just dial back the gain.
yes, if in the example above, you would push the volume all the way to 17 bars and amp dialed in to the 12-13 bars (aka 28.5v), you would push more input signal to the amp, therefore more out of the amp (up to RMS max level) and thus potentially overpowering the speakers (and perhaps the amp as well). keep in mind speakers are also rated for max power (short power "burst"). BTs as well as MMs are rated max power beyond the what the amp can send.
TBH, I never ran the volume up to 12-13 on the stock HU or in my new set up (volume max 60; dialed in to 40) over 33-ish.
the experts here (UN, Pioneer74, GP) will comment on above, I am sure
Outstanding HDF Member
Joined: Jun 2012
Posts: 2,248
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From: Atlanta, Georgia
I've been reading a lot of the threads through here lately and they all seem to talk about how great the PBR300X2 is, however looking at the specs, outside of the BT7.1s it really doesn't look like there is much that can handle it at 2, or even 4 ohms without being overpowered. I'm sure I am completely missing something really obvious here, but are which speakers are people running with this amp outside the BT ones that are not at risk for getting nuked by the amp?
Thanks for the help, I am always impressed by the knowledge in this section!
Thanks for the help, I am always impressed by the knowledge in this section!
Thread Starter
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Joined: Jan 2013
Posts: 75
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From: Jacksonville, FL
Thanks to you guys for the replies. I've read about the gains and took some electrical engineering classes a long time ago that talked about some of that stuff, but the layman's terms there are exactly what I needed. I guess I was under the impression the RMS power of the PBR300X2 being 150 watts per channel at 2 ohms was always going to be pushing that. I didn't even consider the effects of gain in the equation. Thanks again for the education!
Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
I've been reading a lot of the threads through here lately and they all seem to talk about how great the PBR300X2 is, however looking at the specs, outside of the BT7.1s it really doesn't look like there is much that can handle it at 2, or even 4 ohms without being overpowered. I'm sure I am completely missing something really obvious here, but are which speakers are people running with this amp outside the BT ones that are not at risk for getting nuked by the amp?
Thanks for the help, I am always impressed by the knowledge in this section!
Thanks for the help, I am always impressed by the knowledge in this section!
Thread Starter
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Advanced
Joined: Jan 2013
Posts: 75
Likes: 0
From: Jacksonville, FL
If I were to do an upgrade in stages, would you guys recommend doing the speakers and the amp with the stock headunit, or the speakers with aftermarket headunit first? The pros of going with the stock headunit and an amp initially is that I can go with 2 ohm speakers with the PBR300X2. However, going with the aftermarket headunit first would give me a heck of a lot better media connectivity, but would require me to go with 4 ohm speakers since I haven't seen much in the way of 2 ohm HUs besides the HK one.
Any insight from the gurus that have done a ton of swapping is appreciated! I've thought of the DIY rear aux mod to hold me over if I go with the stock HU for a while, but my stock HU has been around the block a few times (84k miles) and could probably use replacement anyway.
Any insight from the gurus that have done a ton of swapping is appreciated! I've thought of the DIY rear aux mod to hold me over if I go with the stock HU for a while, but my stock HU has been around the block a few times (84k miles) and could probably use replacement anyway.
Cruiser
Joined: Oct 2012
Posts: 117
Likes: 38
From: Moultonborough, NH
Eshaw
Eshaw, what do you have your gain set to with your combo, I have just installed the same.
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Outstanding HDF Member
Joined: Mar 2012
Posts: 2,843
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From: Michigan
If I were to do an upgrade in stages, would you guys recommend doing the speakers and the amp with the stock headunit, or the speakers with aftermarket headunit first? The pros of going with the stock headunit and an amp initially is that I can go with 2 ohm speakers with the PBR300X2. However, going with the aftermarket headunit first would give me a heck of a lot better media connectivity, but would require me to go with 4 ohm speakers since I haven't seen much in the way of 2 ohm HUs besides the HK one.
Any insight from the gurus that have done a ton of swapping is appreciated! I've thought of the DIY rear aux mod to hold me over if I go with the stock HU for a while, but my stock HU has been around the block a few times (84k miles) and could probably use replacement anyway.
Any insight from the gurus that have done a ton of swapping is appreciated! I've thought of the DIY rear aux mod to hold me over if I go with the stock HU for a while, but my stock HU has been around the block a few times (84k miles) and could probably use replacement anyway.
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Joined: Nov 2007
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From: East of the Sun, West of the Moon
AMEN brother!
