Struggling with gain settings
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Joined: Sep 2013
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From: Wisconsin
Struggling with gain settings
I have a BT-355 LL connected to a SD400.4D 4 ohm amp bridged going through WDX6MOTO-G2 speakers in the front
I have the identical setup running the 2 tour pak speakers
When I follow the voltage chart to set my gain, the whole thing sounds terrible and heavy base causes clipping
I had to split the lines out of the BT355 to use all 4 inputs in the amp to even get the recommended 28V with 1Khz tone
I went down to 22 volts @ 1Khz tone and still it sounds bad
Looking for ideas or recommended way to set this up right
When I turn the amp gain to 1/4 from lowest setting, it starts to sound better but not very loud
I have the identical setup running the 2 tour pak speakers
When I follow the voltage chart to set my gain, the whole thing sounds terrible and heavy base causes clipping
I had to split the lines out of the BT355 to use all 4 inputs in the amp to even get the recommended 28V with 1Khz tone
I went down to 22 volts @ 1Khz tone and still it sounds bad
Looking for ideas or recommended way to set this up right
When I turn the amp gain to 1/4 from lowest setting, it starts to sound better but not very loud
Grand HDF Member
Joined: May 2014
Posts: 3,843
Likes: 1,174
From: florida
is your crossover switch set on high pass? are the bass and treble on the head unit set at flat or no boost or cut? what volume setting are you at on the head unit?
you need to do some of this by ear,, not just with the volt meter, the speakers have a spec, but that doesn"t mean that they can take a full 200 watts at frequencies below 1khz. set your head unit up according to the sticky thread, make sure your high pass filter is set to HP, then try again, listening for distortion and sound quality.
m
you need to do some of this by ear,, not just with the volt meter, the speakers have a spec, but that doesn"t mean that they can take a full 200 watts at frequencies below 1khz. set your head unit up according to the sticky thread, make sure your high pass filter is set to HP, then try again, listening for distortion and sound quality.
m
Last edited by marcodarq; Oct 3, 2019 at 11:35 AM.
Tourer
Joined: Nov 2017
Posts: 255
Likes: 38
From: Michigan
I have a BT-355 LL connected to a SD400.4D 4 ohm amp bridged going through WDX6MOTO-G2 speakers in the front
I have the identical setup running the 2 tour pak speakers
When I follow the voltage chart to set my gain, the whole thing sounds terrible and heavy base causes clipping
I had to split the lines out of the BT355 to use all 4 inputs in the amp to even get the recommended 28V with 1Khz tone
I went down to 22 volts @ 1Khz tone and still it sounds bad
Looking for ideas or recommended way to set this up right
When I turn the amp gain to 1/4 from lowest setting, it starts to sound better but not very loud
I have the identical setup running the 2 tour pak speakers
When I follow the voltage chart to set my gain, the whole thing sounds terrible and heavy base causes clipping
I had to split the lines out of the BT355 to use all 4 inputs in the amp to even get the recommended 28V with 1Khz tone
I went down to 22 volts @ 1Khz tone and still it sounds bad
Looking for ideas or recommended way to set this up right
When I turn the amp gain to 1/4 from lowest setting, it starts to sound better but not very loud
Tourer
Joined: Nov 2017
Posts: 255
Likes: 38
From: Michigan
Crossover is set to highpass
bass, treble and fade are flat
Boom GTX flashed to "Ultra 0 amp"
using 3/4 volume for voltage readings
Amp is the SD400.4D 4ohm not the newer 4S
bass, treble and fade are flat
Boom GTX flashed to "Ultra 0 amp"
using 3/4 volume for voltage readings
Amp is the SD400.4D 4ohm not the newer 4S
I think your going to struggle with that amp without a DSP. You need to replace the BT355 with a DSP or keep the BT355 and get a different amp.
Last edited by JAGlide; Oct 3, 2019 at 01:19 PM.
Road Captain
Joined: Feb 2016
Posts: 721
Likes: 204
From: Jerseyville, IL
Originally Posted by JAGlide
I think your going to struggle with that amp without a DSP. You need to replace the BT355 with a DSP or keep the BT355 and get a different amp.
Grand HDF Member
Joined: May 2014
Posts: 3,843
Likes: 1,174
From: florida
The high pass crossover setting is fixed at 80 Hz. Not really an issue with most quality speakers.
M
M
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Ultimate HDF Member
Joined: Mar 2015
Posts: 6,446
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From: TEXAS
IMHO running the SD amps that do not have crossover duals without a DSP or very capable HU is not a good idea. Especially when u get into the more aggressive sled audio sandbox.
T
T
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Joined: Sep 2013
Posts: 74
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From: Wisconsin
Could I put the amps on full pass through
Then use a voltmeter to watch voltage drop when I dial the BT355 HPF dials using a 100 or 120 hz tone?
Therefor raising the high pass above the 80hz amp cutoff?
Then use a voltmeter to watch voltage drop when I dial the BT355 HPF dials using a 100 or 120 hz tone?
Therefor raising the high pass above the 80hz amp cutoff?
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