2 Channel Project

[Fast1one 10+ year member]

That's true. For near field, Bass knob FTW. If the speaker is placed close to a wall, the amount of BSC needed is reduced if not eliminated.

Thats true...I think speakers image a little better though with just a little space...I noticed a huge improvement just spacing the speakers 3-4 inches away and toed in about 5 degrees...

 

[PV Audio 5,000+ posts]

That speaker you picked is an excellent driver. Theoretically speaking, it should sound better than the 871s if the latter isn't flush mounted. Whether or not you'd notice that anyway is questionable, but they're still extremely similar. I HIGHLY and when I say highly, I mean higher than miles davis in his prime, recommend that you build a notch filter for it. It dramatically cleans up the tail ends of the response, most notable the high end. Becomes a bit warmer and not as tinny and bright.

 

[sqhertz 5,000+ posts]

That speaker you picked is an excellent driver. Theoretically speaking, it should sound better than the 871s if the latter isn't flush mounted. Whether or not you'd notice that anyway is questionable, but they're still extremely similar. I HIGHLY and when I say highly, I mean higher than miles davis in his prime, recommend that you build a notch filter for it. It dramatically cleans up the tail ends of the response, most notable the high end. Becomes a bit warmer and not as tinny and bright.

thanks alot for the help (sorry to thread jack OP). could any one of you guys draw me up a filter to use? i could shoot you a few bucks or so, i know brianchia does this. it shouldnt be too complicated , right?

currently i use them for the computer , so im less than 2-3 feet from them. if i were to build those , id probably end up using them with the tv , so id be no further than 6-8 feet away in a 10 x 10ft bedroom. i have them on the first gen sonic impact t-amp so theyre seeing less than 10w a piece. i also have a tb 5.25" sub on a 25w plate amp to help out the low end.

im planning on getting one of those compact recievers sometime in the near future so i can have an am/fm turner and all that without taking up the space. specificly , the onkyo cs-415. however i may choose to go with something else if i find one a bit cheaper...

 

[Fast1one 10+ year member]

thanks alot for the help (sorry to thread jack OP). could any one of you guys draw me up a filter to use? i could shoot you a few bucks or so, i know brianchia does this. it shouldnt be too complicated , right?currently i use them for the computer , so im less than 2-3 feet from them. if i were to build those , id probably end up using them with the tv , so id be no further than 6-8 feet away in a 10 x 10ft bedroom. i have them on the first gen sonic impact t-amp so theyre seeing less than 10w a piece. i also have a tb 5.25" sub on a 25w plate amp to help out the low end.

im planning on getting one of those compact recievers sometime in the near future so i can have an am/fm turner and all that without taking up the space. specificly , the onkyo cs-415. however i may choose to go with something else if i find one a bit cheaper...

You would have to measure the speakers to see where the notch filter should be applied...also comes from experience...
Personally, I would just try the speaker with the BSC filter mentioned in the article. That should balance out the sound by a significant amount...don't worry about the notch filter for now...

 

[sqhertz 5,000+ posts]

hm. going over the design , i converted the cm meaurements into inches. personally , i dont own a metric tape measure. would i be safe rouding the numbers up to the nearest 1/16th of an inch?

also , going through partsexpress, i noticed they only have a 3.7 ohm resistor - http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=004-3.7&scqty=2 . could i use that instead? they do have the 1.0 mh inductor though - http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=255-048&scqty=2 .

 

[Fast1one 10+ year member]

hm. going over the design , i converted the cm meaurements into inches. personally , i dont own a metric tape measure. would i be safe rouding the numbers up to the nearest 1/16th of an inch?also , going through partsexpress, i noticed they only have a 3.7 ohm resistor - http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=004-3.7&scqty=2 . could i use that instead? they do have the 1.0 mh inductor though - http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=255-048&scqty=2 .

Should be fine if you round, as long as everything fits together in the end //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
As far as the resistors, if you can, order several ranging between 2-8 ohms and try different ones out to see which works best for your application. Once you finish the enclosures, play around with positioning (against the wall, few inches away, toed in/out, etc) and see what images best. Then add the BSC network and play with resistor values until you get the right balance of bass..

Stick with the 1 mH inductor...

Just be sure to use the 20 watt resistors...

 

[sqhertz 5,000+ posts]

in 20w , they only have a 4 ohm - http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=017-4 .

and i dont need to use a board to mount them on , right?

 

[konechiwa 10+ year member]

thanks alot for the help (sorry to thread jack OP). could any one of you guys draw me up a filter to use? i could shoot you a few bucks or so, i know brianchia does this. it shouldnt be too complicated , right?currently i use them for the computer , so im less than 2-3 feet from them. if i were to build those , id probably end up using them with the tv , so id be no further than 6-8 feet away in a 10 x 10ft bedroom. i have them on the first gen sonic impact t-amp so theyre seeing less than 10w a piece. i also have a tb 5.25" sub on a 25w plate amp to help out the low end.

im planning on getting one of those compact recievers sometime in the near future so i can have an am/fm turner and all that without taking up the space. specificly , the onkyo cs-415. however i may choose to go with something else if i find one a bit cheaper...

no problem. I just have this thread in reference now so when i go to start the project. However, If anyone knows of a cheaper MTM project, i'd be all ears. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[Fast1one 10+ year member]

in 20w , they only have a 4 ohm - http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=017-4 .and i dont need to use a board to mount them on , right?

Well as long as you aren't throwing gobs of power, the 10 watt ones may be fine...
Maybe mount them on a little piece of wood, plastic, etc...but its not necessary...

 

[sqhertz 5,000+ posts]

Well as long as you aren't throwing gobs of power, the 10 watt ones may be fine...
Maybe mount them on a little piece of wood, plastic, etc...but its not necessary...

like i said , i have them getting less than 10w a piece now. sooner or later ill get that micro reciever and put those on it - http://www.onkyousa.com/model.cfm?m=CS-415&class=Audiosys&p=s . so no more than 20 a piece.

ill see if i can find some peg board to throw them on. also i was thinking, do they HAVE to be soldered? or can i just twist the wire with some wire nuts on the ends incase i want to try a differnt filter? i know my soldering skills ....i dont even have any, lol. but i can always learn.

 

[Fast1one 10+ year member]

like i said , i have them getting less than 10w a piece now. sooner or later ill get that micro reciever and put those on it - http://www.onkyousa.com/model.cfm?m=CS-415&class=Audiosys&p=s . so no more than 20 a piece.ill see if i can find some peg board to throw them on. also i was thinking, do they HAVE to be soldered? or can i just twist the wire with some wire nuts on the ends incase i want to try a differnt filter? i know my soldering skills ....i dont even have any, lol. but i can always learn.

Just twist them together when you are trying different values, then if you can solder them to become permanent...
Should be fine with that power...

 

[sqhertz 5,000+ posts]

Just twist them together when you are trying different values, then if you can solder them to become permanent...
Should be fine with that power...

excellent. so , they would be fine in wire nuts for as long as i keep them like that? and i seen alot of people say that its better to round over/chamfer? the back end of the mounting hole for better response. since i have no collets for my router , i really wouldnt be able to. i do have a grinding point for my drill though , it just wouldnt be perfect...

again , thanks alot for the help. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[Fast1one 10+ year member]

excellent. so , they would be fine in wire nuts for as long as i keep them like that? and i seen alot of people say that its better to round over/chamfer? the back end of the mounting hole for better response. since i have no collets for my router , i really wouldnt be able to. i do have a grinding point for my drill though , it just wouldnt be perfect...
again , thanks alot for the help. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

No problem, I love helping people out...
As far as the chamfer, I would suggest trying the best you can to grind some material off...the magnet is huge in comparison to these little buggers, so every little bit helps //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Just pre-drill the mounting holes so you don't chamfer into those...