I'm going to build a Boombox but I have some questions. I hope this is posted in the right place.
As I am quite inexperienced I want to make it simple, therefore I'm planning on using 2 full range drivers so I don't have to use any crossovers. I'm going to build it in a sealed box out of MDF. Is it best to use a coaxial driver like this one https://www.amazon.com/Pioneer-TS-A1676R-6-5-Inch-3-Way-Speaker/dp/B014Z7ILY0/ref=cm_cr_arp_d_product_top?ie=UTF8#Ask or a regular full range driver like this one Goldwood GW-8003/8 8" Full Range Driver w/Whizzer. I haven't found many coaxial drivers larger than 6,5". I want as good bass as possible without too much loss in the highs.
Will there be a big difference in performance/efficiency if I use a 2x20W amplifier (the Lepai LP-2020 class T) instead of a 2x50W? And finally will a passive radiator make any difference? The box will be around 15-20l.
Would really appreciate any input!
As I am quite inexperienced I want to make it simple, therefore I'm planning on using 2 full range drivers so I don't have to use any crossovers. I'm going to build it in a sealed box out of MDF. Is it best to use a coaxial driver like this one https://www.amazon.com/Pioneer-TS-A1676R-6-5-Inch-3-Way-Speaker/dp/B014Z7ILY0/ref=cm_cr_arp_d_product_top?ie=UTF8#Ask or a regular full range driver like this one Goldwood GW-8003/8 8" Full Range Driver w/Whizzer. I haven't found many coaxial drivers larger than 6,5". I want as good bass as possible without too much loss in the highs.
Will there be a big difference in performance/efficiency if I use a 2x20W amplifier (the Lepai LP-2020 class T) instead of a 2x50W? And finally will a passive radiator make any difference? The box will be around 15-20l.
Would really appreciate any input!
Hi, I would go with Pioneer coaxial speakers, they are more sensitive so they require less power , I own a pair of Pioneer 17cm here's a old video that I have with them. https://youtu.be/gAV5OGBzcmo
They were around 25 $, they good mids and highs, and in a good box ( mine is ported ) they sound good, I had them on my old pc sistem , now they are lying around.
these two speakers on a tda7394 get preatty loud. I wanted to do a boombox with them but i need a battery, and a PC UPS 12v 9A would be great ...maybe I will buy one someday and make one. I have made a Boombox too , with 3 drivers two small ( but big magnets tho , 3 inch or so full range from a 5.1 DVD ) and a 5.25" " subwoofer " the sub on one channel of the TDA7394 and the fullrange on the other , ( I didnt used crossover , because the 3" drivers could take easyly the power , BUT a capacitor ( non polar ) between 50uF - 10uF or soo ( depending on how you want to cut the bass ) will do.
If i find some pictures with my boombox I will post them , just as a Ideea, now is lying around because i have no battery for it... it was an old laptop battery wich died
They were around 25 $, they good mids and highs, and in a good box ( mine is ported ) they sound good, I had them on my old pc sistem , now they are lying around.
these two speakers on a tda7394 get preatty loud. I wanted to do a boombox with them but i need a battery, and a PC UPS 12v 9A would be great ...maybe I will buy one someday and make one. I have made a Boombox too , with 3 drivers two small ( but big magnets tho , 3 inch or so full range from a 5.1 DVD ) and a 5.25" " subwoofer " the sub on one channel of the TDA7394 and the fullrange on the other , ( I didnt used crossover , because the 3" drivers could take easyly the power , BUT a capacitor ( non polar ) between 50uF - 10uF or soo ( depending on how you want to cut the bass ) will do.
If i find some pictures with my boombox I will post them , just as a Ideea, now is lying around because i have no battery for it... it was an old laptop battery wich died
Read the comments of that Goldwood speakers, someone said they aren't that efficent ( they require some power ) and they lack mids and highs " slapped two of these in a set of well-made factory cabinets from a famous British monitor maker, roughly 1.75 cu ft internal each. In these cabinets, the 8003s have satisfying, solid bass with good resolution of detail. Unfortunately, they are unacceptably lacking in upper mids and highs-- you can tell you're listening to more than "just a woofer w/o the crossover," but only barely. The problem gets far worse if you're even the slightest bit off-axis from the whizzer cone; there's virtually no dispersion. I also find these speakers to be inefficient-- definitely harder to move than the 87dB printed spec would suggest. In short, don't buy these thinking they will do most of the job of a "known player" connoisseur's full-ranger for a fraction of the price. They are a totally different genre of speaker... they'd be good for a cheap, fun system, but I cannot recommend them at all for budget formal (or even business casual) hi-fi. I am kind of amazed that people are stuffing these into Voigt pipes and are happy with them. "
Thanks for the replies
Yea I understand that these options might not have the best sound quality, but that's not too much of a priority as it will mostly be used outdoors and there's a decent chance the box will break in a year or so. I don't want to spend too much on it. What I'm most concerned about is if they will be loud enough and give decent bass for an outdoor environment.
What about the amplifiers? Is there going to be a significant difference between a 2x20W and an 2x50W?
Yea I understand that these options might not have the best sound quality, but that's not too much of a priority as it will mostly be used outdoors and there's a decent chance the box will break in a year or so. I don't want to spend too much on it. What I'm most concerned about is if they will be loud enough and give decent bass for an outdoor environment.
What about the amplifiers? Is there going to be a significant difference between a 2x20W and an 2x50W?
Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm
That would be a far better choice. It goes reasonably low when ported and requires quite a small enclosure.
Main issue with amplifiers is going to be matching them with batteries. i.e. Giving them the volts they need to be able to produce the power. No point buying a 2x50 amp if it needs 24V and you can only give it 5V.
J.
That would be a far better choice. It goes reasonably low when ported and requires quite a small enclosure.
Main issue with amplifiers is going to be matching them with batteries. i.e. Giving them the volts they need to be able to produce the power. No point buying a 2x50 amp if it needs 24V and you can only give it 5V.
J.
A 50W amp will only sound slightly louder than a 20W due to the logarithmic nature of how we hear relative loudness. However, the 50W will give better headroom, so will tend to have less distortion at a similar volume level to the 20W. I would use a coaxial car audio speaker, eg Pioneer, JVC, Clarion, Kenwood, etc. Just look for the highest dB/W effiency.
Sent from my phone with Tapatalk. Please excuse any typpos.
Sent from my phone with Tapatalk. Please excuse any typpos.
That Goldwood requires over a cubic foot enclosure sealed. It's FR looks horrible outside of normal woofer use. It needs a tweeter IMO.
If you have to....
You end up with a rather large boombox! Something like 14" deep, 26" long and 16-17" high. I guess there's space enough to fit the electrics and controls in amongst that. TBH it's more of a small PA cabinet than a boombox or anything remotely portable. Unless you get esoteric choosing cabinet materials.
I could definitely make the enclosure that big if that is what's needed
It doesn't need to be easily carried . So I will make a rather big box, use the 2x50W amp and a 12V 15Ah battery. I just found these Visatons full range speakers Visaton BG20-8 8" Full-Range Speaker with Whizzer Cone 8 Ohm do you think they will do better than any coaxial drivers like the Pioneer? I get that I should use tweeters and a crossover for a better result, but I think that's a bit to complicated for me.
So you suggest I should use the Lepai 2x20W amp instead?
If the size of the enclosure is no problem, will the Visaton's 8" sound "better" than the 6,5" coaxial Pioneer's? I suspect they might perform a bit worse in the highs, right? As you can tell, I'm not very experienced with this
I haven't listened to either of them.... It's all a bit "Blackadder" and the "famous stone of Galveston". Cultural references are available in script and on youtube format .
I would suggest budgeting power to supply the amp(s) to keep everything happy. No real point in creating a behemoth if you're feeding it mouse sized meals.
.I would suggest budgeting power to supply the amp(s) to keep everything happy. No real point in creating a behemoth if you're feeding it mouse sized meals.
If you want heavy bass in a smaller size boombox, the best option may be to use a 2.1 amplifier and a subwoofer. You could build a very portable but very loud boombox with a relatively small (5" or 6") subwoofer and pair of 4" coaxial car speakers.
If you tune your enclosure to the subwoofer to some extent, the separate bass volume control on the 2.1 amp enables you to adjust the bass volume to your liking. Plus the .1 channel of these type of amplifiers is usually a separate chip in PBTL configuration so you can drive a lot of power to a low impedance (e.g. 3 or 4 ohm) subwoofer.
If you tune your enclosure to the subwoofer to some extent, the separate bass volume control on the 2.1 amp enables you to adjust the bass volume to your liking. Plus the .1 channel of these type of amplifiers is usually a separate chip in PBTL configuration so you can drive a lot of power to a low impedance (e.g. 3 or 4 ohm) subwoofer.
I haven't listened to either of them.... It's all a bit "Blackadder" and the "famous stone of Galveston". Cultural references are available in script and on youtube format
I would suggest budgeting power to supply the amp(s) to keep everything happy. No real point in creating a behemoth if you're feeding it mouse sized meals.
Hahaha I just watched a clip with the "famous stone of Galveston"
I guess I have to look at some reviews and decide for myself That sounds like a great solution! I didn't know there were 2.1 amplifiers, do they work like a crossover and separate the lows and the highs? If so is it possible to adjust at which frequency it should split? I've looked at a few 2.1 amps but I haven't found any answears.
I recently built a small boombox out of two of these:
Peerless by Tymphany TC9FD18-08 3-1/2" Full Range Paper Cone Woofer
and one of these for bass:
Tectonic Elements TEBM65C20F-8 3-1/2" BMR Full-Range Speaker 8 Ohm
I used this amp:
Mini Hi-Fi 2.1 Class D Audio Amplifier Board 2x15W + 30W
and this power supply will work:
Delta EADP-36KB A 12 VDC 3A Power Supply with 5.5 x 2.5mm Plug
I have the TC9's open baffle and the Tectonic is in a small enclosure, like this one but I built it myself:
Denovo Audio Knock-Down MDF 0.04 cu. ft. Micro Bookshelf Speaker Cabinet Pair
Not bad for what it is. Fun and puts out quite a bit of decent sound for a little less than $70.
Mike
Peerless by Tymphany TC9FD18-08 3-1/2" Full Range Paper Cone Woofer
and one of these for bass:
Tectonic Elements TEBM65C20F-8 3-1/2" BMR Full-Range Speaker 8 Ohm
I used this amp:
Mini Hi-Fi 2.1 Class D Audio Amplifier Board 2x15W + 30W
and this power supply will work:
Delta EADP-36KB A 12 VDC 3A Power Supply with 5.5 x 2.5mm Plug
I have the TC9's open baffle and the Tectonic is in a small enclosure, like this one but I built it myself:
Denovo Audio Knock-Down MDF 0.04 cu. ft. Micro Bookshelf Speaker Cabinet Pair
Not bad for what it is. Fun and puts out quite a bit of decent sound for a little less than $70.
Mike
Think I will go for the same amp! Do you know how it separates the frequencies? So I can simply connect the power supply to the amp and the strip the plug and connect it to a 12V battery? That should work right?
Will definitely go for a similiar build like yours, cheers.
The webpage says the low pass filter is set for 150Hz. It was a fun project and doesn't sound horrible. I might try enclosing the TC9's just to see if I like it better.
Your idea of using a battery should work. Keep me posted if you would. It would be even better if it was battery powered along with AC powered so it would be truly portable.
Mike
Your idea of using a battery should work. Keep me posted if you would. It would be even better if it was battery powered along with AC powered so it would be truly portable.
Mike
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