Awesome info. The hope is that I eventually get smart enough to even turn on a scope!! Im assuming that all of the guys that will be testing this stuff will be using DD1s and DMMs without any load. Think the O Scope will be some pretty advanced stuff for this grass roots effort, but ya never know.

Any info & education you can provide as we try and work thru these audio tuning topics is greatly appreciated.

Thanks in advance!!!!!!

T.

 

Whats the cheapest dmm/dd1 or o-scope someone can buy and dial their equip in with?

 

Stand by as I am trying to get as much info together that will really only require a 25 buck DMM for those of us running the same stuff. The DD1 is pretty damn simple and cool though and that thing is about $150.

 

$25? Hell of a deal right there. Or ill just go to Texas and see who i can find.

 

Max HU Volume for Rushmore HU = 16
Max BT355 Gain Setting w Rushmore HU = Default setting
Confirm BT4180 / BT2180 amp output is clean at above settings. Confirmed at speaker outputs on the amp using the DD-1 and a 1K -5 tone at volume 15 and bike not running.
Note: The default marks on the LL can be off by as much as an hour (caveman settings). This is where a DMM will come in handy. Will post VAC number upon request.

 

Great info Bert. I like the cave man style.

I think we can agree that 15/17 is the max clean HU setting for the Rushmores.

As for the LL, my DD1 shows 1:45 as the max clean setting (green/ red light margin) and pulled it back to 1:30 for the margin. Brought the front / fairing back to about 12:45 as that was the sweet spot for those lower RMS speaks.

This is where I was hoping that those of us that were playing with the DD1, Rush HUs, and BT355s were going to have more consistent readings. The difference between the BT default setting that you found as max and the 1:45 that I found is actually huge in the scheme of things. Oh well.

It is great to see that u r using the -5 test tone as I think that is much more prudent. -7 or -10 might even come into play.

T.

 

Are you connecting the DD1 into the LL via RCA? When I do this with a 1K -5 or -10 I get the Signal and Detect lights but Distortion flickers while raising the gains.

This is where the DMM will come into play for those without a DD1, once the caveman evolves.

 

Using 1k -5 and have tried both the LL output and the end of an 18" RCA. Maybe a little random flicker at both sources but solid red is what I am using as the finish line. Turning gains on LL as slow as imaginable gets no flicker.

Since we can roughly say that 15/17 on HU should not be exceeded and that 12:00 to 1:30 on the LL gains, and that no one else is playing my little cave man game, I guess we could evolve.

On the BT4180, what is the target Voltage you are trying to obtain on the output (where the speaker wires plug in) w HU at 15 since Slyes damn good chart does not specifically have the BT Watts?

T.

 

How many volume clicks are there on the Boom system? Here is what I found last year using a scope:


https://www.hdforums.com/forum/audio...ion-level.html

 

Ok, I'll have to try this method.

I'm playing...

Not knowing the method you where using I set the gains with the DD1 at the amp speaker outputs and ended up with 25.24VAC on the left, and 25.01 on the right.

This is still a work in progress.