Need some advice on a level booster... - diyAudio
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Old 30th April 2012, 08:40 PM   #1
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Default Need some advice on a level booster...

I need to boost the audio from my projector (line out). Because the output is so low, my amp is on 100% volume so if you switch to phono input and a record is playing, the sound is deathly loud. (I personally remember to volume down, but sometimes friends don't know the low audio signal from the projector). Not to mention, it's a major waste of energy to the amp running at 100% to get a good level watching a movie.

Does any one have any thoughts they can share on these two products?

Amazon.com: TCC TC-780LC Stereo Line Level Amp / Booster with iPod Jack; BLACK VERSION: Electronics

Line Level Gain Boost
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Old 1st May 2012, 01:19 AM   #2
Simon B is offline Simon B  United Kingdom
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Neither of the products you link to inspire confidence that they'll give the degree of boost you appear to need.

The LGB-1 lists as having only 12dB of gain, its controls are recessed, though it does come with a wall wart, for $35.

The TC-780 claims up to 20dB gain, actually has a volume knob, doesn't appear to come with a wall wart, costs $55 on offer and includes in its "Technical Specification" "RIAA frequency response" which is only appropriate for record pickups. Copy and paste gone wrong I think.

This isn't really much to do with diy, so you might not get much on this. That's $5 please, paypal accepted.
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Old 1st May 2012, 02:11 AM   #3
cbdb is offline cbdb  Canada
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Are you sure the output from the projector is not turned down in software or somewhere else?
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Old 1st May 2012, 09:48 AM   #4
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by vikchop View Post
........... it's a major waste of energy to the amp running at 100% to get a good level ..........
This not true.

The attenuator at the input does not change what the amplifier is doing nor how it does it.

If the attenuator is turned "full up" then all that is happening is that you are feeding the input signal with zero attenuation.
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Old 1st May 2012, 01:17 PM   #5
Simon B is offline Simon B  United Kingdom
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Quote:
Originally Posted by cbdb View Post
Are you sure the output from the projector is not turned down in software or somewhere else?

Yes, what interfaces does it have for control? On screen menus? Make sure you RTFM, (Read the fine manual). If you don't have it, search online, "<model-number> manual" and on the manufacturers website.

Andrew's right about the power dissipation, it's volume out, not volume pot setting, if anything, that determines it.



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Old 1st May 2012, 01:28 PM   #6
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The projector has a volume control on it, and that's maxed too.

Thanks for the information.

I think I'm going to go with the Line Level Gain Boost, as it has a volume control on it. Just want to make sure there's a "wall wart" on it because I don't know how amplification could occur w/o power...
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Old 1st May 2012, 01:48 PM   #7
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I would seriously look at the controls on the projector.

Almost everything is LINE-OUT compatible these days.

OK, you might need to crank up the volume a bit but FULL seems WRONG to me.

My CD Player has two outputs, one FULL and one ATTENUATED within the software of the CD player, they use the same RCA sockets and are switched within the software.
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Old 1st May 2012, 02:10 PM   #8
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I looked at the projector manual online: https://www.audiogeneral.com/BenQ/w1000+_manual.pdf

Looks like there is an "HDMI Amplifier Gain" setting that I will check when I get home. Maybe that'll do the trick. I presume that would gain both audio and video signals.

A few other points about the way it's set up.

1. HDMI incoming signal is coming via a 4 in / 2 out powered splitter. There's about 10 ft HDMI to the projector from this splitter. The wires in to the splitter are 1.5 ft.

2. In terms of audio output, it is via 1/8th inch jack to female RCA like this:
Premium 3.5mm to 2 x RCA Splitter Cable Male to Female
and then about a 25 foot RCA to the "CD/DVD" input of the amp. (The amp is older, JVC - sounds great. Analog.)

All wires are excellent quality (from Infinite Cables), but yes the signal is traveling 30-40 feet (10 via HDMI and then 25 via RCA cable as noted above), and there are splitters in the mix.

I'll update the thread once I up the amplifier gain. Thanks again for the suggestions.
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Old 2nd May 2012, 01:28 PM   #9
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So I upped the HDMI Amplifier gain through the menu system of the projector from 1 to 3 and there was little noticeable difference to audio and video. I'm guessing the long wire runs and different wires that audio is traveling through is depleting the signal strength. As such, I will go forward with this:

Phonopreamps.com TCC TC-780LC Details and Hookup

Thanks everyone.
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Old 2nd May 2012, 05:51 PM   #10
Simon B is offline Simon B  United Kingdom
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That looks the better of the two units you mentioned.

One thing you might try is checking whether there is another input on the amp that you could use. I've come across one or two older hifi amps that had a much more sensitive aux input than the cd input. Worth a try perhaps, if there is an otherwise unused 'aux' or 'tuner' input. Not a phono input though - don't try that, way too sensitive and wrong eq.
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