AVS Forum banner

1 - 3 of 3 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
I plan on mounting a tv to the wall, having the audio out go to a 2.0 or 2.1 amplifier and then out to two 8 inch in wall speakers. Ideally I would like to mount the equipment behind the TV on the wall.


I want this for good sound for TV watching / music and loud enough to fill a large (about 25 x 15) room without doors for my wife's dance parties. Also I would like to do it reasonably priced, roughly $200 for speakers and amp and power.


I will be buying the Monoprice 8-inch high powered in-wall speakers:
http://www.monoprice.com/Product?c_id=108&cp_id=10837&cs_id=1083703&p_id=6816&seq=1&format=2


I am a little OCD and need some practical advice instead of my overkill theories about what is needed.

Ideally, I would like to get this 2.1 amplifier with this included power adapter:
http://www.sureelectronics.net/goods.php?id=2600

It is a Class D TDA7498 amp with a 24v 5a 120w power adapter. If this is sufficient to fill this room with these speakers and send an adequate signal to a powered amp, I would love to call it done.


HOWEVER, my overkill OCD read some review on the 7498 that it responds well to a larger power supply so I would want to get a Meanwell 200w 24v/8.3a Switched-Mode Power Supply
http://www.sureelectronics.net/goods.php?id=2601


or buy the amp alone and buy this Genssi 36v/350w SMPS
http://www.amazon.com/Genssi-Regulated-Switching-Power-Supply/dp/B005CLCJA6/ref=sr_1_1?ie=UTF8&qid=1395644448&sr=8-1&keywords=genssi+350w+36v


Now this raises the whole "am I going to kill myself because electricity" question. Someone suggested I need to enclose the SMPS in something else because mains power supply requires it. Now that opens a whole can of worms. I am willing to go down that road if it makes a really big difference.


I have also heard great things about this Class T amp - the Dayton Audio DTA-120:
http://www.parts-express.com/dayton-audio-dta-120-class-t-digital-mini-amplifier-60-wpc--300-3800


Should I just get something like that instead? It only has a 120w power supply as well.


Or should I find a good price on a full blown receiver? Like this one
http://www.accessories4less.com/make-a-store/item/denavr1513/denon-avr-1513-5.1ch-home-theater-receiver-3d-ready/1.html



HELP! My research and lack of knowledge/experience has completely overwhelmed me!



tl;dr


Will this amp with 120w power adapter fill a large (25'x15') room with sound and sound good with the Monoprice 8" in-wall speakers?
http://www.sureelectronics.net/goods.php?id=2600


Edit: Major lurker here... obviously I joined in 2007 and this is my first post...
 

·
Banned
Joined
·
14,420 Posts

Quote:
Originally Posted by mhoward84  /t/1524031/amp-selection-power-requirements-and-speaker-pairing#post_24521818


I plan on mounting a tv to the wall, having the audio out go to a 2.0 or 2.1 amplifier and then out to two 8 inch in wall speakers. Ideally I would like to mount the equipment behind the TV on the wall.


I want this for good sound for TV watching / music and loud enough to fill a large (about 25 x 15) room without doors for my wife's dance parties. Also I would like to do it reasonably priced, roughly $200 for speakers and amp and power.


I will be buying the Monoprice 8-inch high powered in-wall speakers:
http://www.monoprice.com/Product?c_id=108&cp_id=10837&cs_id=1083703&p_id=6816&seq=1&format=2


I am a little OCD and need some practical advice instead of my overkill theories about what is needed.

Ideally, I would like to get this 2.1 amplifier with this included power adapter:
http://www.sureelectronics.net/goods.php?id=2600

It is a Class D TDA7498 amp with a 24v 5a 120w power adapter. If this is sufficient to fill this room with these speakers and send an adequate signal to a powered amp, I would love to call it done.


HOWEVER, my overkill OCD read some review on the 7498 that it responds well to a larger power supply so I would want to get a Meanwell 200w 24v/8.3a Switched-Mode Power Supply
http://www.sureelectronics.net/goods.php?id=2601

Just to present an alternative viewpoint, once you buy this 2 channel amplifier and an add on power supply you will have probably made an investment that is comparable your costs for this AVR:

http://www.accessories4less.com/make-a-store/item/denavr1513/denon-avr-1513-5.1ch-home-theater-receiver-3d-ready/1.html . The AVR provides a ton more just about everything it takes to make an audio system sound good, and will do a good job of driving just two speakers. It has about one ton more power, two tons if you use more then 2 channels. I see that you have been looking at this alternative already.


The biggest problem I see with the AVR is not its cost but its physical size. These little switchmode amps sure are tiny and cute, but they have a lot of useful functions that you may want now or later missing, such as bass management.
Quote:
or buy the amp alone and buy this Genssi 36v/350w SMPS
http://www.amazon.com/Genssi-Regulated-Switching-Power-Supply/dp/B005CLCJA6/ref=sr_1_1?ie=UTF8&qid=1395644448&sr=8-1&keywords=genssi+350w+36v


Now this raises the whole "am I going to kill myself because electricity" question. Someone suggested I need to enclose the SMPS in something else because mains power supply requires it. Now that opens a whole can of worms. I am willing to go down that road if it makes a really big difference.

I have a fair amount of experience with SMPS of this general kind and I use a few around the house to power appliances such as tire pumps that are designed to run off of 12 volt power from an automobile. IMO their most dangerous aspect is the terminal strip connection to mains power:




To use these power supplies outside of some kind of protective case, bare terminals carrying lethal voltages are exposed to probing fingers. At the very least putting the power supply in some kind of enclosure that precludes this kind of access is mandatory for a household device.


I used the picture above because it does a little bit better job of displaying the terminals than the Amazon picture of the power supply that you mention. It is all the same from a safety standpoint and without some kind of additional protection it is a giant FAIL.
Quote:
I have also heard great things about this Class T amp - the Dayton Audio DTA-120:
http://www.parts-express.com/dayton-audio-dta-120-class-t-digital-mini-amplifier-60-wpc--300-3800


Should I just get something like that instead? It only has a 120w power supply as well.


Or should I find a good price on a full blown receiver? Like this one

http://www.accessories4less.com/make-a-store/item/denavr1513/denon-avr-1513-5.1ch-home-theater-receiver-3d-ready/1.html



HELP! My research and lack of knowledge/experience has completely overwhelmed me!



tl;dr


Will this amp with 120w power adapter fill a large (25'x15') room with sound and sound good with the Monoprice 8" in-wall speakers?
http://www.sureelectronics.net/goods.php?id=2600


Edit: Major lurker here... obviously I joined in 2007 and this is my first post...

Your need for power mainly depends on


(1) Your preferences for maximum listening loudness

(2) The efficiency of your speakers

(3) Your speaker positioning with respect to nearby large room surfaces - wall or ceiling mounting is about as good as you can get

(4) Listening ditance


If you currently have an audio system you can make reasonably accurate measurements of your preferences or current situation with respect for loudness with a peak reading, peak holding SPL meter such as this one:

http://www.ebay.com/itm/8928-Decibel-Meter-Digital-Accurate-Sound-noise-pressure-Level-tester-40-130-db-/271167212819


This online calcuator facilitates turning items 1-4 into an estimate for power:

http://myhometheater.homestead.com/splcalculator.html
 

·
Registered
Joined
·
2 Posts
Discussion Starter #3

Quote:
Originally Posted by arnyk  /t/1524031/amp-selection-power-requirements-and-speaker-pairing#post_24522232


Just to present an alternative viewpoint, once you buy this 2 channel amplifier and an add on power supply you will have probably made an investment that is comparable your costs for this AVR:

http://www.accessories4less.com/make-a-store/item/denavr1513/denon-avr-1513-5.1ch-home-theater-receiver-3d-ready/1.html . The AVR provides a ton more just about everything it takes to make an audio system sound good, and will do a good job of driving just two speakers. It has about one ton more power, two tons if you use more then 2 channels. I see that you have been looking at this alternative already.


The biggest problem I see with the AVR is not its cost but its physical size. These little switchmode amps sure are tiny and cute, but they have a lot of useful functions that you may want now or later missing, such as bass management.

I have a fair amount of experience with SMPS of this general kind and I use a few around the house to power appliances such as tire pumps that are designed to run off of 12 volt power from an automobile. IMO their most dangerous aspect is the terminal strip connection to mains power:


To use these power supplies outside of some kind of protective case, bare terminals carrying lethal voltages are exposed to probing fingers. At the very least putting the power supply in some kind of enclosure that precludes this kind of access is mandatory for a household device.


I used the picture above because it does a little bit better job of displaying the terminals than the Amazon picture of the power supply that you mention. It is all the same from a safety standpoint and without some kind of additional protection it is a giant FAIL.

Your need for power mainly depends on


(1) Your preferences for maximum listening loudness

(2) The efficiency of your speakers

(3) Your speaker positioning with respect to nearby large room surfaces - wall or ceiling mounting is about as good as you can get

(4) Listening ditance


If you currently have an audio system you can make reasonably accurate measurements of your preferences or current situation with respect for loudness with a peak reading, peak holding SPL meter such as this one:

http://www.ebay.com/itm/8928-Decibel-Meter-Digital-Accurate-Sound-noise-pressure-Level-tester-40-130-db-/271167212819


This online calcuator facilitates turning items 1-4 into an estimate for power:

http://myhometheater.homestead.com/splcalculator.html

Thanks for the response Arny!

I actually just noticed (not sure how I lost it...?) that I have an old Onkyo TX-8211 stereo receiver sitting around. I will hook that up and just see how it sounds. I will have to figure out an aesthetic way to place it.


I have the monoprice 6.5" in wall speakers in my bedroom on a TX-SR573 and they sound pretty decent but the midrange is painful to my ears when I turn up the volume and way too "droney"

I am just worried that these 8 inch speakers might not sound that great as well. To be fair I haven't done any kind of configuring on the receiver and am sure that would probably help.



How is the sound quality on one of those T or D amps vs the Denon or my Onkyo receiver? Does it do a better job with just the 2 speakers? All other features aside.
 
1 - 3 of 3 Posts
Top