Harley Davidson Forums

Audio Systems Find answers to all of your stereo, speaker and other audio technology questions here.
Sponsored by:
Sponsored by:

Help with DMM gain setting

Thread Tools
 
Search this Thread
 
Old Jan 20, 2018 | 12:40 PM
Share
  #1  
Cheesehead_13's Avatar
Cheesehead_13
Thread Starter
|
Tourer
Joined: Mar 2014
Posts: 485
Likes: 32
From: Phoenix, AZ
Default Help with DMM gain setting
Ok, never did this before and having a tough time, but looking for guidance. Aquatics HU, JL 280/4 bridged in stereo, DDAW's. Trying to set gains with DMM.
  • Amp out FR- taped to black lead on DMM
  • Amp out FL+ taped to red lead on DMM
  • DMM set to ACV
  • Volume on HU set to 30/40
  • 1000 hz test tone downloaded from sticky at top of forum
  • Power on, test tone playing: max voltage showing is 15.4 volts. I believe bridged should be 23.7v per the installation guide.
Any ideas wtf I am doing wrong? It's driving me nuts. There is no way that it should be .5x23.7=11.8v per side is there?

Thanks in advance.
 
Reply
0
Old Jan 20, 2018 | 12:51 PM
Share
  #2  
Tailwind's Avatar
Tailwind
Ultimate HDF Member
Joined: Mar 2015
Posts: 6,446
Likes: 873
From: TEXAS
Default
Input voltage switches.

T
 
Reply
0
Old Jan 20, 2018 | 12:54 PM
Share
  #3  
Cheesehead_13's Avatar
Cheesehead_13
Thread Starter
|
Tourer
Joined: Mar 2014
Posts: 485
Likes: 32
From: Phoenix, AZ
Default
Originally Posted by Tailwind
Input voltage switches.

T
on DMM?
 
Reply
0
Old Jan 20, 2018 | 12:58 PM
Share
  #4  
Tailwind's Avatar
Tailwind
Ultimate HDF Member
Joined: Mar 2015
Posts: 6,446
Likes: 873
From: TEXAS
Default
Originally Posted by Cheesehead_13
on DMM?
Amp

T
 
Reply
0
Old Jan 20, 2018 | 01:04 PM
Share
  #5  
Cheesehead_13's Avatar
Cheesehead_13
Thread Starter
|
Tourer
Joined: Mar 2014
Posts: 485
Likes: 32
From: Phoenix, AZ
Default
Originally Posted by Tailwind
Amp

T
currently on low. Should I set to high? Do i leave it on high once gains are set?
 
Reply
0
Old Jan 20, 2018 | 01:11 PM
Share
  #6  
Tailwind's Avatar
Tailwind
Ultimate HDF Member
Joined: Mar 2015
Posts: 6,446
Likes: 873
From: TEXAS
Default
Originally Posted by Cheesehead_13
currently on low. Should I set to high? Do i leave it on high once gains are set?
Typically in low but depends on your wiring setup. Turn gains all the way down and see what impact it has in high v low.

Also make sure ur DMM is reading VAC.

T
 
Reply
0
Old Jan 20, 2018 | 01:23 PM
Share
  #7  
Tailwind's Avatar
Tailwind
Ultimate HDF Member
Joined: Mar 2015
Posts: 6,446
Likes: 873
From: TEXAS
Default
Are u wired 4 channel bridged? Switch at 4 channel input?
Gator clips on correct wires?

T
 
Reply
0

Trending Topics

Old Jan 20, 2018 | 02:09 PM
Share
  #8  
Cheesehead_13's Avatar
Cheesehead_13
Thread Starter
|
Tourer
Joined: Mar 2014
Posts: 485
Likes: 32
From: Phoenix, AZ
Default
Originally Posted by Tailwind
Are u wired 4 channel bridged? Switch at 4 channel input?
Gator clips on correct wires?

T
Low voltage input, 4 channel (bridged in stereo),filter at 80hz, filter mode hp
DMM taped to wires from amp
DMM set to VAC (ACV)
 
Reply
0
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-1

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-2

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-3

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-4

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-5

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-6

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-7

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
story-8

Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

 Verdad Gallardo
story-9

The Best and Worst Harley-Davidson Moves of 2025

 Verdad Gallardo
Old Jan 20, 2018 | 02:10 PM
Share
  #9  
Cheesehead_13's Avatar
Cheesehead_13
Thread Starter
|
Tourer
Joined: Mar 2014
Posts: 485
Likes: 32
From: Phoenix, AZ
Default
Originally Posted by Tailwind
Typically in low but depends on your wiring setup. Turn gains all the way down and see what impact it has in high v low.

Also make sure ur DMM is reading VAC.

T
no difference high vs low input
 
Reply
0
Old Jan 20, 2018 | 02:48 PM
Share
  #10  
Cheesehead_13's Avatar
Cheesehead_13
Thread Starter
|
Tourer
Joined: Mar 2014
Posts: 485
Likes: 32
From: Phoenix, AZ
Default
No difference with bike running or not running. I have no idea what's up.
 
Reply
0



Advanced Search
Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 04:30 PM.

story-0
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-1
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-2
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-3
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-4
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-5
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-6
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-7
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE
story-8
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

Slideshow: Graeme Billington's left-hand-drive Shovelhead is as much about problem-solving as it is about classic Harley form.

By Verdad Gallardo | 2025-12-30 11:27:08


VIEW MORE
story-9
The Best and Worst Harley-Davidson Moves of 2025

Slideshow: A clear-eyed look at what actually worked for Harley this year, and what quietly undermined its progress.

By Verdad Gallardo | 2025-12-29 17:10:48


VIEW MORE