I'm doing an install at a clients house and have yet to select an amp (receiver) It needs to be powerfull as he has 5 additional rooms with a pair of in-ceiling speakers in each one, plus outside zone with Bose 191's. He already has an existing switching box to select which rooms he wishes to have on. I already understand he will not have volume control for each independant zone, yet his existing amp doesnt seem to be powerfull enough as it will swich off when turned up to a fair volume. His budget is around £600 but if more, he will streatch. He likes the Denon and especially sony. Would the Sony DA1200 be up to the job? Thankyou to anyone who helps. Sorry if there are any spelling errors in this question.
2006-12-19 11:26:44 · 7 answers · asked by Anonymous in Consumer Electronics ➔ Home Theater
The reason his current amp is cutting out when it is turned up full is that it is overheating and the thermal cut out switch is cutting the power supply to save any damage to it !
Any future amp you get ( doesnt matter wich make ) MUST be fan assisted otherwise you are going to have the same problem again !
My son is a dj and has had this problem himself in some of the club`s he has installed systems in !
Problem was solved as soon as he installed a couple of fan`s in the amp`s ..... Hope that help`s ........ Good luck
2006-12-19 11:53:39 · answer #1 · answered by charlotterobo 4 · 0⤊ 0⤋
If you are doing professional installs, you should already know the answer to this question. You may want to spend some time apprenticing with an installation company before heading out to service clients yourself. Maybe take some of the basic CEDIA installer classes.
What your client has right now is your basic fire waiting to happen. I wouldn't touch it with a 10 foot pole. The answer is obviously that you need an additional amp, preferably multi-zone to handle the other rooms. Also, wiring up a system without control (volume/source selection) in remote zones is a major no-no. I would encourage the client to rethink things and see about doing a retrofit with a distributed digital system or at least get him some form of control in each room or they will never end up using the system since it will be a major pain in the **** to use. If you have some way to tap into the speakers in each room and they are wired for network, you could suggest a Sonos System that will give each zone control. Unless the client did it themselves, whoever did that wiring job should be drawn and quartered.
Oh, and the previous poster may want to recalculate the impedence load. 12 speakers running at 4 ohms isn't 48 ohms unless you are doing some bizarre series/parallel stunt. It is actually closer to a dead short (0 ohms). The client has a switch box with an impedence matching section that likely keeps the impedence matched at 8 ohms , but the amp is crapping out because of the current and voltage loads. Even if the impedence was that high, most single amps would end up with squat for damping factor, would still be trying to push massive amounts of voltage and would still sound like doo doo.
2006-12-20 21:29:09 · answer #2 · answered by The Soundbroker 3 · 0⤊ 0⤋
You will need more than one amp- from what you have described your client requires a total of 12 speakers, and if for example, these speakers have an impedance rating of 4 ohms, your amp will have to have an impedance rating of a massive 48 ohms! This is calculated by dividing the impedance of the amp by the number of speakers. If you used the Sony DA1200 to power 12 speakers, the amp would be incapable to handle the impedance and would essentially blow up. I would definatly suggest investing in an active speaker system-this is where each speaker has its own amp, or buying 4 or 5 amps and daisy chaining the signal. Hope this helps.
2006-12-20 11:35:40 · answer #3 · answered by mallybb298 3 · 0⤊ 0⤋
some good answers below but ohms law is causing your issue - between long lengths of wire going to the speakers plus the load of the various speakers at any one time you are basically pushing the amplifier beyond what it was designed for.
Your options are to either power each rook with its own amplifier (somethgin smaller ) and run a boosted pre-amp signal to each one or consider commercial style amplifier that uses 70v ( at least here in north america) each speaker then gets a small transformer attached to it - the amplifier has a coresponding transofrmer built in or optional is available - there is some calculation required to figure out how much power et cyou need.
some links attached to help explain and some calculations also
this type of system is usually found in commercial buildings, arenas, churches, shopping malls etc fopr paging background music -
Consider finding a commercial sound business that could assist in some of the components for this type of system while matining a denon unitas the front end
As noted US/Canada use 70v other countries it could be 25 or 100v
2006-12-19 12:12:12 · answer #4 · answered by mrdg90 4 · 0⤊ 0⤋
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2006-12-19 11:37:50 · answer #5 · answered by Cindy W 1 · 0⤊ 4⤋
sony ebay
2006-12-21 05:39:20 · answer #6 · answered by munchie 6 · 0⤊ 0⤋
Ur hung up on peak/max numbers on the Pyle and Sony. The orain is prob rms numbers. RMS is wat to go by. Pyle is prob overrated on the rms too.
2016-05-22 22:18:34 · answer #7 · answered by Anonymous · 0⤊ 0⤋