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Matching speakers to amplifier Answered

i have purchased 2 Maxamp20 amplifiers (http://store.accusafe.nl/modules/versterkers/maxamp20-met-3-5mm-connector) and i am trying to match speakers to them, i've searched audio forums for information (that i mostly don't understand) and tried asking questions (that have been mostly ignored) and i think i've found appropriate speakers but i want to get a second opinion before i purchase stuff i might not be able to return. i don't have the space for and can't afford the weight requirements of a large enclosure but i want fairly high volume and wide dispersion so im looking at getting 2 of these PA horns (http://www.specotech.com/index.php/products/audio/item/542-spc40rp) to mount on top of a shallow down firing enclosure for 2 of these subs (http://store.accusafe.nl/onderdelen/luidsprekers/subwoofer/dayton-audio-sd215a-88-8-dvc-subwoofer-speaker). i know the subs work with that amplifier because they are used in Boominators (http://www.diyaudio.com/forums/class-d/104402-boominator-another-stab-ultimate-party-machine.html) but i have no idea about the horns. also assuming this setup is okay do i need some kind of filter or crossover (not sure of the difference) to split the sound safely between the midrange and the sub speakers?


You need a properly matched crossover to make it work, that's for starters.
I don't know what you intent to do with it but when it comes to making a speaker system there is more than grabbing an amp and some speakers.
The amp is unknown to me so I can't judge the audio quality for it.
The speakers will certainly make noise with a suitable crossover but I am not certain that I would call the output music.
You need to match the frequency range of the speakers with the crossover and for that use the right speakers.
Unless you want to go for better 3-way system you need to experiment with the frequencies and cut off's for the crossover.
With one low frequency speaker and one high frequency speaker your midrange might get a bit lost.
By the way: The volume of the enclosure must also match the requirements of the speaker in question to avoid distortions and other unwanted effects.

how do i find a properly matched crossover?

how do i work out the minimum enclosure volume for 1 or 2 of those subs?

why wouldn't you call the output music? am i missing something apart from crossovers?

i thought those horns were midrange, they look far too big to be tweeters...

i didn't include tweeters because i thought that 4 channels meant 4 speakers, can the amps take the addition of 2 tweeters somewhere?

i did find some horns marked as midrange and mid-high during google searches but they didn't look like something you could mount outside of an enclosure. i also found full range pa music speakers but they were listed as '100v line' (such as this: https://www.cybermarket.co.uk/shop/public-address/horn-speakers/it-400tw-2-way-100v-weatherproof-735260.html?gclid=CjwKEAiA9s_BBRCL3ZKWsfblgS8SJACbST7Doq_16fF3CN_QmLqHCsHeh4qJo1M48eDUL85_LW7GNhoCEIjw_wcB ) and as i need this setup to run off 12v batteries on a trailer i didn't think they would work

If the quality of the sound is not required to match the input you could simply use one mid-high range speaker and a mid-low range one.
Usually speakers are also matched by the Decibels at a given power level.
After all you don't want a weak sub with a horn or tweeter that is constantly screaming at you.
There are website that go into much more details when it comes to designing good speakers.
Some real music lovers "waste" over 10 grand just for their amps and add another 50 for the speakers and wiring, not to mention modifications to their homes...
I can't be too sure but did you consider to just buy a small PA system at one stage?

By making it yourself to match the speakers and range you need or by getting one in a shop and selecting the speakers to suit.

By checking the datasheet or using the volume of a very similar speaker case as reference.

If the system is no match you stuff like you see on the road: A rolling boom box that makes the numberplate rattle but has no linear frequency range.
Think of music like this: You want to be able to hear a full orchestra with all instruments pretty much the same way as if you were listenening to it live.

4 channels either means 2 "mirrored" stereo signals or a front stereo with rear speakers for a semi-surround sound.
You can add as many speakers to the output of the amp if the crossover has the support for it.
There are commercial systems with more then 10 speakers per channel...