Denham studio monitors build

[aqus]

I have build the dynamic series in the past and now wanted to make speakers for my office/studio to do my dj mixing.
Following a suggestion from another site and lots of reading I went with the Denham kit which I purchased from diysoundgroup which I waiting the arrival shortly.
I started making my boxes I will post pictures as I go.

My question is I posted a picture of my office. I am planning to replace the speakers you see there. I know it is not ideal due to the wall being close. But I am planning to move it approx 1 foot out with ceiling brackets instead and move the right one approx 2 feet so it is not in the corner. Probably not ideal as they will still be close to wall but don't have much choice.
My question is can I put them high up like that and point them down towards me or is it better sitting them on my desk on a foam pad? Ideally I rather have them in the air as it will take less space and I don't have to move the printer.

I have some leftover polyfill from my first project can I put them in there?
I noticed a lot of other MTM builds have a double baffle, is it necessary?

I have other questions but will wait till kit comes in as it might already have the answers like port lenght and placement.

TIA

[aqus]

Re: Denham studio monitors build



I have a 1-1/4" thickness all around for the braces and I left approx 4" in the middle so if I have to cut through for the port I still have enough strenghth all around

[andykriech]

Re: Denham studio monitors build

Is there room from behind your desk to the wall? if so, how much?
You could put them on pole/stands to get them off your desk, if that is easier than mounting from the ceiling.

HTH, Andy.

[aqus]

Re: Denham studio monitors build

If I place them on the edge of the desk I have approx 10" from the back of the speaker to the wall.
I thought of putting them on stands behind the pc monitors but that will leave me even less spce behind

Also any input for the polyfill and the double baffle?
Thanks

[dustinbagby]

Re: Denham studio monitors build

The double baffle isnt necessary. If you were building a beefy subwoofer, then yes, but with the woofers youre using and the bracing youve got, you arent going to notice a difference (or enough of one to deal with the hassle of routing a double baffle and routing the recesses on the inside to allow the woofer to breathe).

Ported speakers are usually lined with some sort of open cell foam, not stuffed with polyfil (this option is typically used in sealed speakers).

[aqus]

Re: Denham studio monitors build



Input needed first time I put together a crossover. Can anyone tell me if connections and placement especially the inducers are correct..
I know it's a little messy I will tidy up as I solder.

[dustinbagby]

Re: Denham studio monitors build

Its all looks correct to me, but there are a couple spots that are a little confusing (I do think I am seeing them correctly, however).

Not sure of the actual distance between your inductors (appears to about ~2") but that is sufficient. However, for the sake of bringing everything in tight and cleaning it up, you can leave the larger inductor laying flat and stand the smaller one up at a 90° angle, placed relative to the larger inductor like a wheel thats rolling directly onto another wheel.

[aqus]

Re: Denham studio monitors build



Ok crossovers are done. Now I have a junior question.
Is my negative run Ok? Or should it be seperate when running from input terminal? right now it connects tweeter and woofer inducers in one run(not sure I am explaining it right... )

[bullittstang]

Re: Denham studio monitors build

What you have looks fine as long at the solder connections are good.

[bmaupin]

Re: Denham studio monitors build

crossovers look great. i like how you did the ground!

[aqus]

Re: Denham studio monitors build



Almost done crossovers are in. I tested them with the speakers and are working.
I cut the 2" port to 3.83" to tune to 40hz. Got figures from online calculators. I don't have to cut through the brace so I will keep its strength. Between the end of the port and the brace I have 2-1/4" therefore read somewhere that as long as I have the same space or greater as the diameter of the port it should be ok. If not correct let me know since I can still make a hole before gluing the baffle.

Next step is to bring the baffle at work tomorrow and thermoform black shinny pvc on it. We make kitchen counters and pvc kitchen doors

[bullittstang]

Re: Denham studio monitors build

I think you will be fine. If it is a little too close (which i don't think it is), it will cause a slight (read as very slight) chuffing from the port. Since the port is on the back and you will be listening pretty loud at the point of it chuffing... you will never hear it over the music.

[bmaupin]

Re: Denham studio monitors build

I have no idea why Jeff did not specify the port to use to avoid chuffing, but I'd expect a 3" un-flared port to be a minimum diameter. The only mention of a port is someone that used this: http://www.parts-express.com/speaker...lared--260-480

[aqus]

Re: Denham studio monitors build

yes I know. I read practically every thread that exists on the denham speakers. And one of them someone asked what port and size to use and Jeff just said to use an online calculator...
I bought the kit from diysoundgroup and they sent a 2" port.

[aqus]

Re: Denham studio monitors build



Project finished I received my pvc baffles and installed components.
Sound so far is ok not as blown away as when I build the dynamics. But I know I do not have then in an ideal placement and drivers need to break in. I did put some foam under them to decouple them.
Also know these are studio flat monitors. I did spend about an hour doing some mixes and playing pretty loud. They do not distort at all. And my ears weren't buzzing afterwards.
Also was playing remixed tunes so probably not the best quality audio I will have to do more testing.
So all is good just not sure it was worth the $700 cdn investment, and supposed to be worth much more. I have heard some yamaha's HS80M's with built in amp for about the same price and they sounded very good. But did not do an A B test to compare.
So Jeff thank-you for your contribution I did have a good time making them.