BT355 AMP Setting Question
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Tourer
Joined: Aug 2011
Posts: 444
Likes: 51
From: Northwest Arkansas
Hey FM, thanks for the response. On the 2015 RGS I previously had I was running a Cerwin Vega B2 with Kappa 62.11i speakers (2 in the fairing). I recently traded that bike in on a 2018 RGS and I've installed similar gear just updated versions. Specifically Cerwin Vega B52 and Kappa 62.ix (2 in the fairing) on the new bike. I didn't remember whether I had the previous install set at AP or HP. When I did this latest installation I set the AMP to HP on the flip of a coin. Used BT355 LOC for both installs though.
I just finished an 1800 mile ride out to the Rockies and this current setup sounded really bright (almost shrill to me on some genres). It lacked some low end punch and not much warmth in the mid range compared to my last setup (at least as I can remember...............)
I've played with the bass and treble controls on the head unit and I've got it decent now, but started to thinking that I might have messed up when I set the AMP to HP. Gains were set on both systems using my hand held Oscilloscope following all the normal procedures. The only differences in the systems;
1. On the 2015 install I sealed the pods
2. On the 2015 install I used polyfill
3. B2 versus B52
4. Kappa 62.11i versus Kappa 62.ix
I've got the HP frequency filter on the B52 set at approximately 80Hz.
I just finished an 1800 mile ride out to the Rockies and this current setup sounded really bright (almost shrill to me on some genres). It lacked some low end punch and not much warmth in the mid range compared to my last setup (at least as I can remember...............)
I've played with the bass and treble controls on the head unit and I've got it decent now, but started to thinking that I might have messed up when I set the AMP to HP. Gains were set on both systems using my hand held Oscilloscope following all the normal procedures. The only differences in the systems;
1. On the 2015 install I sealed the pods
2. On the 2015 install I used polyfill
3. B2 versus B52
4. Kappa 62.11i versus Kappa 62.ix
I've got the HP frequency filter on the B52 set at approximately 80Hz.
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Joined: Oct 2012
Posts: 2,186
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From: Mi
Those kappa's are bright, there is a button on them to turn the tweeter down 3db.
You can leave the amp on HP and adjust the X-over down a little bit and see if it will give a little more low end. I would not expect much from them though.
You can leave the amp on HP and adjust the X-over down a little bit and see if it will give a little more low end. I would not expect much from them though.
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Joined: May 2018
Posts: 64
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From: New England
I am getting ready to install the same speakers (62ix) in my 16 SGS because I want something a little louder and clearer, and I think the 62ix will provide that. I believe you will use HP on the amp for the crossover setting (which you have already done). The 62ix has a frequency response of 45Hz-25kHz, so you could try turning the crossover down some as fmfpj mentioned above. However the button on the tweeter is 0db (depressed) to +3db (pressed), so pressing the button will actually add +3db which will make the sound even harsher, so I would make sure it's depressed for the 0db setting.
I plan to add some poly fil during my installation so I will post back once done and let you know if the addition of poly fil helped any. That said I do have access to a Fluke handheld oscope and was wondering if you wouldn't mind detailing the steps you took to tune the amp with the oscope? I tried it brielfy but couldn't seem to make it work. You can PM me if you'd prefer.
I plan to add some poly fil during my installation so I will post back once done and let you know if the addition of poly fil helped any. That said I do have access to a Fluke handheld oscope and was wondering if you wouldn't mind detailing the steps you took to tune the amp with the oscope? I tried it brielfy but couldn't seem to make it work. You can PM me if you'd prefer.
Last edited by Skrimps; Aug 3, 2018 at 04:08 PM.
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Tourer
Joined: Aug 2011
Posts: 444
Likes: 51
From: Northwest Arkansas
So I reached out to Diamond Audio and posed my question to one of their tech support guys. He told me to run the AMP on High Pass with the frequency set at approximately the 8 o'clock position. That's exactly what I did and where I set the crossover when I did the installation. However, I found an old email that I exchanged with Bill @ BT back in May of 2015 and he said that the AMPs should be set on Full when using the BT355. He said in his email to pass the entire frequency range onto the BT355 and let their LOC do the rest. So both of the manufacturers are giving different answers to the same question.
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Thread Starter
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Tourer
Joined: Aug 2011
Posts: 444
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From: Northwest Arkansas
I plan to add some poly fil during my installation so I will post back once done and let you know if the addition of poly fil helped any. That said I do have access to a Fluke handheld oscope and was wondering if you wouldn't mind detailing the steps you took to tune the amp with the oscope? I tried it brielfy but couldn't seem to make it work. You can PM me if you'd prefer.
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found an old email that I exchanged with Bill @ BT back in May of 2015 and he said that the AMPs should be set on Full when using the BT355. He said in his email to pass the entire frequency range onto the BT355 and let their LOC do the rest. So both of the manufacturers are giving different answers to the same question.
