nice video, Mr Ethan.
Definitely my kind of edutainment!
Scott
How good are your frequency response
-
Waterboy
- Posts: 3
- Joined: Sun May 13, 2007 12:49 pm
- Location: Denham Springs, La.
- Contact:
Re: How good are your frequency response
Tiny Home Studio Dimensions:
20' (L) x 8' (W) x 9' (H)
- 1/2" Drywall, R15 Insulation
- Vinyl Tile Flooring on Concrete
- (4) BareTraps, (1) Primacoustic London 12A Room Kit
- Focal Twin6 Be's, RX12 recoil Stabilizers
- ECM8000 (for measurement)
20' (L) x 8' (W) x 9' (H)
- 1/2" Drywall, R15 Insulation
- Vinyl Tile Flooring on Concrete
- (4) BareTraps, (1) Primacoustic London 12A Room Kit
- Focal Twin6 Be's, RX12 recoil Stabilizers
- ECM8000 (for measurement)
-
ThomasT
- Posts: 82
- Joined: Thu Apr 13, 2006 1:56 am
- Location: Erfurt - Germany
- Contact:
Re: How good are your frequency response
So, back to acoustics ...
I measured the room again. For comparision the last measurment is included as well (I hope it the same). Note - the ruler scales are different from those of the last post.
Differences are:
- Leather couch in the middle of the room (at 38% from the backwall, but not due to acoustic but to go behind it through the door an othe side)
- installed 100mm thermowall panel (covered with plastic and fabric) in the upper room corner (where the hatch to the attic ist). So the whole rear wall - ceiling corner is covered with a corner absorber.
- installed first reflections point absorbers on the right position (with mirror)
- installed corner "basstrap" absorber (a 1250mmx625mmx100mm Thermowall again) on the frontwall-floor.
red is current measurting, green is the old one
I still wonder where the 300Hz null comes from.
I measured the room again. For comparision the last measurment is included as well (I hope it the same). Note - the ruler scales are different from those of the last post.
Differences are:
- Leather couch in the middle of the room (at 38% from the backwall, but not due to acoustic but to go behind it through the door an othe side)
- installed 100mm thermowall panel (covered with plastic and fabric) in the upper room corner (where the hatch to the attic ist). So the whole rear wall - ceiling corner is covered with a corner absorber.
- installed first reflections point absorbers on the right position (with mirror)
- installed corner "basstrap" absorber (a 1250mmx625mmx100mm Thermowall again) on the frontwall-floor.
red is current measurting, green is the old one
I still wonder where the 300Hz null comes from.
-
mika
- Posts: 195
- Joined: Thu Apr 28, 2005 5:18 am
- Location: germany
- Contact:
Re: How good are your frequency response
What kind of spreakers did you use?
i can`t belive that a speaker have that much energy under 20hz
down to 5hz 
There must be something wrong with measurements
i can`t belive that a speaker have that much energy under 20hz
down to 5hz There must be something wrong with measurements
-
ThomasT
- Posts: 82
- Joined: Thu Apr 13, 2006 1:56 am
- Location: Erfurt - Germany
- Contact:
Re: How good are your frequency response
Hi Mika,
good question. Indeed I did not care about frequencies below 50 Hz. I use JBL LSR32 flush mounted, their rollof begins - AFAIR - at 50Hz.
I think the slight increase from 300Hz downward is due to the flush mounting - indeed I like it and do not even want to compensate it.
The increase below 50Hz is indeed interessting. I have several ideas, starting with accidentally used compensation curve. (in this case it starts at 40Hz) or wrong compansate C-Curve (e.g. the audio out of the SPL Meter has no C-weighting).
I will check this out. I wanted to measure again anyway. Even the near field system (Control 1).
But I don't think this will affect the range between 50Hz and 4kHz in any way. But I'm a software engineer in the day job, so I've seen a lot of bugs that could never exist.
In my old studio I used the LSR 32 only to check low frequencies or when I want "pressure" (some guitarist needed that for feeling) but I listen mostly to the near fields. In my new studio I felt not even the necessity to switch on the near fields during tracking. (except bass guitar) The stereo image is really good and defined. The frequency response is much better than in the old room ... but...not perfect. There are some issues left.
good question. Indeed I did not care about frequencies below 50 Hz. I use JBL LSR32 flush mounted, their rollof begins - AFAIR - at 50Hz.
I think the slight increase from 300Hz downward is due to the flush mounting - indeed I like it and do not even want to compensate it.
The increase below 50Hz is indeed interessting. I have several ideas, starting with accidentally used compensation curve. (in this case it starts at 40Hz) or wrong compansate C-Curve (e.g. the audio out of the SPL Meter has no C-weighting).
I will check this out. I wanted to measure again anyway. Even the near field system (Control 1).
But I don't think this will affect the range between 50Hz and 4kHz in any way. But I'm a software engineer in the day job, so I've seen a lot of bugs that could never exist.
In my old studio I used the LSR 32 only to check low frequencies or when I want "pressure" (some guitarist needed that for feeling) but I listen mostly to the near fields. In my new studio I felt not even the necessity to switch on the near fields during tracking. (except bass guitar) The stereo image is really good and defined. The frequency response is much better than in the old room ... but...not perfect. There are some issues left.