(loudspeakerSystem)=
# Overview
The main advantage of using electroacPy is its **loudspeakerSystem** class. It
provides multiple tools such as:

  - lumped element calculator for loudspeakers and enclosures, this includes basic alignment tools and Thiele/Small parameter loaders,
  - bempp-cl wrapper to easily setup acoustic studies,
  - tools to work with vibrometry data,
  - automated evaluation setup for polar and spherical radiation, pressure fields and more,
  - save/load functions to easily back-up and share projects.

A **loudspeakerSystem** object manages sub-objects through dictionaries. Each
drive unit, enclosure, study and evaluation added to the system can be accessed
through the corresponding dictionary:

  - `.driver[]`, 
  - `.enclosure[]`,
  - `.crossover[]`,
  - `.vibrometry[]`,
  - `.acoustic_study[]`,
  - `.evaluation[]`,
  - `.results[]`.

A **loudspeakerSystem** object is defined as simply as: 
```python
import electroacPy as ep

#%% Create system object - with pre-defined frequency axis
system = ep.loudspeakerSystem()
```

The default frequency axis is defined from 20 Hz to 2500 Hz with 50 points. Alternatively, you can specify custom frequency axis, which must be a `numpy` array. 
```python
import electroacPy as ep
from electroacPy import gtb

#%% Create a system object with a custom frequency axis
frequency = gtb.freqop.freq_log10(10, 5000, 75)
system = ep.loudspeakerSystem(frequency)
```


```{figure} ./drawings/System.svg
  :name:

Class structure.
```