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PostPosted: 08 Jan 2010, 07:58 
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Joined: 27 Sep 2009, 12:56
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Location: Montreal Canada
I want to put a Sonic impact t-amp with speakers in my small teardrop trailer project (frame is alerady done) and i have in hand NOS automotive speakers i can use.

These are Boston acoustic 705, 5 inch 1/4,double cone,1 inch voice coil 20 watts 4 ohm 93dB at .5 meters. These was made in Japan in the 80's and the suspension is made of rubber.(not foam)

Space is limited so open baffle speakers is preferable. Is these speakers will gave good results or it's better to look for other ones.
best regards.

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PostPosted: 11 Jan 2010, 21:57 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Hi decibel,
There is a pretty good chance that the car speakers are best suited for open baffle use. Find some cardboard and give them a listen.
Cheers

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PostPosted: 12 Jan 2010, 12:08 
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Also, when you do the cardboard seal it with duct tape and then cut progressivly larger holes to see if you like the sound being vented at all. I did this with an old 1989 Accord LXi back set of speakers and it worked out great for me.


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PostPosted: 31 Jan 2010, 10:45 
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I try the speakers without any enclosures and the sound is not bad.

I found 2 sites about t-amp modification, one only upgrade the pot and the connectors http://www.tnt-audio.com/clinica/t-amp_tweaks_e.html
and the other modify the input section to get a better bass response http://www.michael.mardis.com/sonic/start.html

My speakers have a 58-17000 hz response so maybe just a new pot will be sufficient.(i have a 50k Alps from a dead Sugden amplifier)

Also one site recommend to put a 10.000 mfd capacitor in parallel with the DC input when using battery, is this will improve the results with a regulated power supply too?

Best regards.


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PostPosted: 01 Feb 2010, 13:05 
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Can you post a link to the site that uses a cap and battery. More capacitance should help reduce PS ripple. Depending on the PS is may make a big difference or not much of one at all.

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PostPosted: 01 Feb 2010, 17:55 
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Location: Montreal Canada
Here's the site who talk about using battery.
http://www.michael.mardis.com/sonic/power.htm

Here's one guy who have done (nearly) all tweaking possible.
http://sebastian-pitkanen.blogspot.com/ ... t-amp.html

Not sure if i will go to replace the input caps, delicate operation and not sure of the improvement with my full ranges of 56-17000hz frequency response.

I use a regulated power supply with the t-amp with my computer but in my RV i will use a deep cycle 12 v battery and a charger.

Best regards.


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PostPosted: 02 Feb 2010, 13:07 
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A regulated supply 1A+ or battery should work well with that amp which are quite decent given the ultra-low cost. you have all the info you need between those sites, so have some fun and enjoy.
Cheers

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PostPosted: 18 Mar 2010, 20:47 
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Joined: 27 Sep 2009, 12:56
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Location: Montreal Canada
Here's my nearly completed reboxed t-amp.
Image
I only upgrade the pot, the C10 cap with an average 470mf and add a10.000mf in parallel with the DC supply and it really improved the sound over my other unmodded t-amp.The input jack is from an old computer. Unit is 5" by 5" by 2.5" Now the biggest part is the teardrop trailer.


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PostPosted: 20 Mar 2010, 17:32 
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Nice. Are you happy with the sound from the little T-amp. An RV seems like an ideal place for the little efficient amp.
Cheers

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PostPosted: 28 Mar 2010, 18:06 
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Yes very happy with the results.
My RV will be very small so the speakers will be near field.
Spring is here, work will begin nearly.
Regards.
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