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Old 22nd January 2015, 12:31 AM   #1
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Location: Lehigh Valley, PA
Default Need advice on what speaker to build

Hi all,
This is my first time posting on this forum - people are very helpful here, and I'm hoping to get some advice on a project I'm planning, and I'm hoping to seriously get into diy audio as a hobby.

I'd like to use my old Onkyo amplifier in my living+kitchen area (the two are connected). The shape of the room is a rectangle about 35 feet by 16 feet. I'd like to build two speakers that I can position at one end of the space, which will hopefully fill the space with sound.

The amplifier is the following: Onkyo TX-SV515PRO Manual - Audio Video Control Tuner Amplifier - HiFi Engine

The system will be exclusively for music listening. I need suggestions for a speaker build that would be suitable to use with it. I've never built a speaker before, but I'm a competent woodworker, so building complex cases is not a problem.

Here are my inclinations, based on the little reading I've done, but I'm prepared to be talked out of any of them!

1. Stereo sound, won't use the center and rear outputs of the amp.
2. Single driver speaker (first build, best keep it simple!)
3. A full-range driver in a transmission line box sounds appealing, from what I read.
4. I'd like the cost of each driver to be at most $100. (When I get better, I'll try more expensive drivers)
5. I'd like to get as "audiophile" a sound as possible within these constraints :-)

Looking forward to some great ideas. Oh yeah, and in case it helps, I live in the US, in the Lehigh Valley, in Pennsylvania.

Have a great day, folks!
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Old 22nd January 2015, 12:58 AM   #2
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Quote:
Originally Posted by udoitall View Post
2. Single driver speaker (first build, best keep it simple!)
4. I'd like the cost of each driver to be at most $100. (When I get better, I'll try more expensive drivers)
5. I'd like to get as "audiophile" a sound as possible within these constraints :-)
based on those criterion my 1st suggestion would be Alpair 7.x.

There are TLs, and Horns, and bookshelves for it.

dave
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Old 22nd January 2015, 12:44 PM   #3
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Default Alpair 7.3

Quote:
Originally Posted by planet10 View Post
based on those criterion my 1st suggestion would be Alpair 7.x.

There are TLs, and Horns, and bookshelves for it.

dave
Thanks, Dave!

These seem to be very nice speakers for the application, judging from the specs.
And I had a look at your sites - lots of great information there, thanks!

Now on to choosing a cabinet. The Frugel-Horn MK3 seems to be not too hard to make and promises good performance.

I'm also toying with the idea of going through the calculations and designing some kind of folded TL box myself.

All suggestions are welcome!
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Old 22nd January 2015, 09:51 PM   #4
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Build a spiral horn. I've got one with a 5". Sounds great, lot's of bass too. Cal says that the little ones are for girls and bigger is better for these so someone needs to do an 8" and report back. You could make a big splash here with one of those!
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Old 22nd January 2015, 10:26 PM   #5
chrisb is offline chrisb  Canada
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FH3 is a very nice performer, and if you're not uncomfortable with the curved sides, not a particularly complicated build. Another very simple type would be an MLTL - of which there are several proven designs for - Pensils by Scott, and Bob Brines' - for Alpairs, & Fostex in the nominal 4-6" size range.

A quick browse on-line for the owner's manual suggests the Onkyo doesn't have LFE / subwoofer outputs that are now common, and while I'm a fan of the Alpair7, if this system will be used for videos / movies in an open floor space of 560ft^2,you might want consider a larger driver - either of the 10s or Fostex FF165WK would be on my short list.

Of course, there will be more more advice forthcoming - careful what you wish for
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Old 22nd January 2015, 10:58 PM   #6
sreten is offline sreten  United Kingdom
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Hi,

Its a big space, and hard to fill with an FR, none of which BTW
will be able to handle 80W per channel at full tilt in the bass.

Personally I wouldn't mess around and I'd build this :
https://sites.google.com/site/undefinition/tarkus

It is the sort of speaker you need IMO, and the best
IMO of a very limited choice of suitable DIY designs.
For sure IMO its a great bang for buck design, and
make no mistake, its a genuinely hifi loudspeaker.

Unlikely to dissapoint in any sense.

rgds, sreten.

Being a big space it wil have low room modes,
35 to 16 is not a bad ratio for smooth low bass,
nevertheless, if the speakers go low enough,
the room modes will reinforce the low bass.
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Last edited by sreten; 22nd January 2015 at 11:19 PM.
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Old 22nd January 2015, 11:47 PM   #7
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Quote:
Originally Posted by sreten View Post
Its a big space, and hard to fill with an FR, none of which BTW will be able to handle 80W per channel at full tilt in the bass.
My space is larger and i don't have issues.

Who cares if it handles 80 w, as long as it plays loud enuff... 80 w just gives more headroom.Safer to have too much power than too little.

dave
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Old 23rd January 2015, 12:18 AM   #8
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by planet10 View Post

My space is larger and i don't have issues.

Who cares if it handles 80 w, as long as it plays
loud enuff... 80 w just gives more headroom.
Safer to have too much power than too little.

dave

Hi,

Self justification isn't pragmatic advice, it is simply bias.

rgds, sreten.

Bias is riddled with assumptions and complications. It
is hardly ever right about anything, being self-serving.
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Last edited by sreten; 23rd January 2015 at 12:34 AM.
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Old 23rd January 2015, 01:17 AM   #9
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I would recommend Fane Sovereign 12-250TC or 12-200LT
The 250 is to 17KHz and the 200 is to 10KHz.
I have both speakers in cabinets and they sound very good.
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Old 23rd January 2015, 01:28 AM   #10
chrisb is offline chrisb  Canada
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sreten:
The Tarkus may well be an excellent system, and not too difficult a build with the thorough documentation, but I'd wager total cost well above OP's implied budget of $200 for this initial project
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