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Search: Posts Made By: David Analog
Forum: Audio/Stereo 04-14-2017, 10:25 AM
Replies: 34
Views: 1,017
Posted By David Analog
OK, so let me get this straight. All amplifier...

OK, so let me get this straight.
All amplifier inputs disconnected. I would normally say to short the inputs, but if you have substantial noise with the gains at zero, that shouldn't be necessary....
Forum: Audio/Stereo 04-13-2017, 07:43 PM
Replies: 33
Views: 1,122
Posted By David Analog
There are so many variables that can undermine...

There are so many variables that can undermine the basics. Here are a few basics. If correctly executed (and this requires some factory correction), an IB sub can perform very well. If you have a low...
Forum: Audio/Stereo 04-13-2017, 07:21 PM
Replies: 34
Views: 1,017
Posted By David Analog
I your case, the HU would normally ground at...

I your case, the HU would normally ground at distribution closest to the amplifier, rather than at the battery. Why? Because grounding the HU at the battery would effectively double the distance...
Forum: Audio/Stereo 04-12-2017, 08:07 PM
Replies: 34
Views: 1,017
Posted By David Analog
This differs from boat to boat depending on the...

This differs from boat to boat depending on the equipment and battery(s) locations. Sometimes the battery and amplifiers are so close to one another that the two terminations are essentially the...
Forum: Audio/Stereo 04-12-2017, 07:50 PM
Replies: 33
Views: 1,122
Posted By David Analog
Looks great throughout. You have to take what the...

Looks great throughout. You have to take what the boat gives you and there's not a better second subwoofer location for that boat.
Forum: Audio/Stereo 04-12-2017, 10:57 AM
Replies: 7
Views: 262
Posted By David Analog
I really enjoy and prefer the smooth sound of JL...

I really enjoy and prefer the smooth sound of JL Audio speakers in the boat. JL Audio has the 880 tower speaker and when using two pair and properly powered, will be strong at wake range.
However, if...
Forum: Audio/Stereo 04-10-2017, 04:12 PM
Replies: 34
Views: 1,017
Posted By David Analog
This faulty scenario won't cause noise 100% of...

This faulty scenario won't cause noise 100% of the time as there are a few variables. However, once you DO HAVE noise, this is one of the first steps you MUST take. Because until you completely...
Forum: Audio/Stereo 04-10-2017, 01:41 PM
Replies: 34
Views: 1,017
Posted By David Analog
As JimN accurately stated you cannot just add an...

As JimN accurately stated you cannot just add an additional amplifier into an existing system without taking certain ground loop elimination steps. Just as a single example:
Factory HU originally...
Forum: Audio/Stereo 04-09-2017, 10:02 AM
Replies: 33
Views: 1,122
Posted By David Analog
You have to be a little cautious with the power...

You have to be a little cautious with the power to the IB 10". Yes, an unregulated amplifier can lose 25% of its 14.4V rated power with a 12.6V supply. However, the conservatively rated JL Audio...
Forum: Audio/Stereo 04-08-2017, 07:52 PM
Replies: 34
Views: 1,017
Posted By David Analog
Did your on-line dealer have any suggestions for...

Did your on-line dealer have any suggestions for you?
Forum: Audio/Stereo 04-08-2017, 01:26 PM
Replies: 34
Views: 1,017
Posted By David Analog
Among the JL Audio M, MC, MHD series amplifiers,...

Among the JL Audio M, MC, MHD series amplifiers, there is absolutely zero difference in the amplifier designs that would make a difference in noise. All have DC to DC power supplies which completely...
Forum: Audio/Stereo 04-07-2017, 08:16 PM
Replies: 33
Views: 1,122
Posted By David Analog
Thus far I see nothing but really good decisions...

Thus far I see nothing but really good decisions and solutions.

Doubling the power to the 770s will be a huge improvement.
Forum: Audio/Stereo 04-01-2017, 10:42 AM
Replies: 6
Views: 343
Posted By David Analog
Here's the problem with the JL Audio method as...

Here's the problem with the JL Audio method as described on their site. It works perfectly for their (JL Audio) amplifiers because they have pre-tested their amplifiers with a high current load...
Forum: Audio/Stereo 04-01-2017, 09:41 AM
Replies: 6
Views: 343
Posted By David Analog
The JL Audio M6450 is an old AB amplifier but...

The JL Audio M6450 is an old AB amplifier but uses a more conservative method of power specs prior to CEA2006 standards. So by today's weaker standards, that is a 600+ watt amplifier.
The Wetsounds...
Forum: Audio/Stereo 03-31-2017, 02:39 PM
Replies: 28
Views: 2,504
Posted By David Analog
Yes, the phasing issue between different subs is...

Yes, the phasing issue between different subs is an issue of different phase rotations (each type sub having a distinctly different changing phase curve = different phase at different frequencies)....
Forum: Audio/Stereo 03-27-2017, 04:23 PM
Replies: 28
Views: 2,504
Posted By David Analog
Still not a fan of mixing infinite baffle and...

Still not a fan of mixing infinite baffle and bass-reflex subwoofers on the same deck of the same boat. Phase soup is not something that a DSP can really fix.
The IB sub has its own unique and...
Forum: Audio/Stereo 03-21-2017, 05:52 PM
Replies: 30
Views: 1,487
Posted By David Analog
The speaker that you referenced, and the Infinity...

The speaker that you referenced, and the Infinity speaker in that price point, has what is known as a 'W' dome tweeter. If you look closely, it is about a 1" cone with a small 3/8" dome in the...
Forum: Audio/Stereo 03-19-2017, 01:26 PM
Replies: 2
Views: 173
Posted By David Analog
Not much to go wrong on something this simple....

Not much to go wrong on something this simple. This begins with measuring the voltage across the BT +/- supply, at the BT unit connectors, rather than at any other reference point. You should have...
Forum: Audio/Stereo 03-17-2017, 08:18 PM
Replies: 20
Views: 745
Posted By David Analog
As a ratio, .707 of the original voltage. So if...

As a ratio, .707 of the original voltage. So if the original voltage were to be 10. volts, the minus 3 dB point is 7.07 volts.

Over and out.
Forum: Audio/Stereo 03-16-2017, 09:16 PM
Replies: 20
Views: 745
Posted By David Analog
Easy. You have a multimeter and you already have...

Easy. You have a multimeter and you already have used test tones. So use a 100 Hz test tone and measure the amplifier AC output voltage while turning the active crossover dial until you read minus 3...
Forum: Audio/Stereo 03-16-2017, 08:35 PM
Replies: 20
Views: 745
Posted By David Analog
It might help to know what amplifier it is.

It might help to know what amplifier it is.
Forum: Audio/Stereo 03-16-2017, 11:12 AM
Replies: 20
Views: 745
Posted By David Analog
Very good point! I have experienced amplifiers...

Very good point! I have experienced amplifiers that were a full octave off the nomenclature on the variable low & high pass filters. The cheaper amplifiers usually have a worthless front end. Also,...
Forum: Audio/Stereo 03-15-2017, 11:49 PM
Replies: 20
Views: 745
Posted By David Analog
There are many on-line tutorials. Here's one...

There are many on-line tutorials. Here's one example: http://m.wikihow.com/Set-the-Gain-on-a-Car-Amplifier
While none of these two or three paragraph tuning procedures are particularly precise, and...
Forum: Audio/Stereo 03-15-2017, 10:05 AM
Replies: 10
Views: 494
Posted By David Analog
Thick fiberglass structures block sound...

Thick fiberglass structures block sound transmission. Dense seat cushions attenuate sound. Any bass energy dissipated in the bow direction is lost to those sitting in the cockpit. The large...
Forum: Audio/Stereo 03-14-2017, 12:22 PM
Replies: 3
Views: 198
Posted By David Analog
Yes, the HT-4 would work. Here's one option...get...

Yes, the HT-4 would work. Here's one option...get a second & identical Kicker amplifier to bridge. Too much power for your current speakers but you can tune accordingly. Then you would be set for...
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